Yokogawa - Service & Support

FAQ

General questions

We want to use a DC supply. Is there a recommended DC/AC inverter (DC/AC power supply)?: We recommend PROWATT by STATPOWER. When the built-in printer is not used, a PROWATT250 series supply can be used. When the built-in printer is used, please use a PROWATT800 supply or equivalent to avoid power capacity problems.
Do the following free software programs that can be downloaded from the web site need to be decompressed? Waveform Viewer for DL series Demonstration Program Data Viewer for the DL AR Series Data Conversion Sample Program for the DL, AR Series (ana.exe): The Waveform Viewer for DL series Demonstration Program must be decompressed. Data Viewer for the DL, AR Series must be decompressed. Data Conversion Sample Program for the DL, AR Series (ana.exe) is a self-decompressing file, so no decompression is necessary.
We are performing FFT analysis in the 10 kHz to 100 kHz range on the DL1540. How long does it take for the DL1540 to acquire the signal and display the result of the FFT? Are there other models that can compute FFTs faster?: L1540: Number of computed points 1000, approx. 1.2 s DL2700: Number of computed points 1000, approx. 200 ms.
How are the data series arranged during the envelope mode? If the data saved to the floppy disk are viewed on a PC, in what order are the data lined up?: The maximum data followed by the minimum data are stored according to the sampling rate specified by the T/div setting. The data are taken from the data sampled by the A/D converter at 100 MS/s. The maximum and minimum values are determined at the same interval as the sampling rate that is specified with the T/div setting.
If I break a passive probe such as the 700998 within one year of purchase, is it covered by a warranty?: Because of their relative low cost, passive probes are classified as consumables and as such, are not covered by a warranty. More expensive probes such as the FET Probe and the Current Probe are covered by a warranty.
When using the FET probe (700939) on digital oscilloscopes other than the DL7100, how should power be supplied to it?: You can use the probe power supply (700938) that appears in the current probe (700937) catalog. One probe power supply (700938) can supply power to two FET probes (700939).
What is the replacement model for the discontinued 150 MHz probes 700952 and 700996?: The replacement model for 700952 is 700996. The replacement model for 700996 is 700998. Currently, this is the probe that comes standard with the DL1500 Series and other oscilloscopes. The probe attenuation of 700952 and 700996 was fixed to 10:1. The probe attenuation of 700998 can be switched between 10:1 and 1:1. Note that accessories such as miniclip converters are not compatible.
Both the catalog and the User's Manualdo not specify the capacity adjustment range when the 700978 probe and the oscilloscope are used together. What are the values?: 10 pF to 30 pF.
What is the accessory part number for ground leads, etc. for the 100:1 probe (700978)?: The accessories for the 100:1 probe are not sold individually. Thus, there are no part numbers for them. It is sold only as an accessory set (700979).
What is the time difference of the signal on channels that use the isolation input unit (700926) and those that don't?: Probe 8.5 ns, Instrument 50 ns, BNC cable (1 m) 5 ns.
When the waveform data that are measured using the frequency input unit of the Analyzing Recorder AR4800 are loaded and displayed, the values are not correct. Why not?: The free software Data Viewer for the digital oscilloscope series and Analyzing Recorder Series supports only the most commonly used voltage input data. To view other types of inputs, such as temperature, frequency, logic, etc., please consider our Data Viewer Pro for Analyzing Recorder AR4000 software (sold separately).
Since probe 700985 is the same as the one used for the DL2700, the toggle frequency is 80 MHz. Can the probe support higher speeds? In addition, can the concept of "toggle frequency" be thought of as "the logic frequency that can be acquired"?: This means that if the logic signal is less than or equal to 80 MHz, the signal can be observed as a consistent toggled logic waveform. In other words, signals higher than 80 MHz cannot be observed as logic waveforms. We applied an ideal rectangular waveform to compare its rise time with the previous one, and found it to be about 2 ns or shorter. This is less than or equal to 2 samples even when sampling at 1 GS/s. Thus, we conclude that this does not lead to large phase difference in the realtime sampling mode.

DL7100 SignalExplorer

How long does it take to save data to the HDD?: Approximately 15 s when saving 4 channels at 1 MW/ch (4 MW total, 8 MB) in the waveform format (*.wvf). This result is obtained when the recommended HDD, Buffalo 4.3 GB HDD by Melco, is used. The time may vary when other HDDs are used.
How can loaded waveform data be deleted?: Select UNLOAD from the FILE menu. The CLEAR TRACE Key does not delete a loaded waveform.
What is the SCSI connector type?: Half-pitch 50-pin (pin type).
What is the recommended external HDD?: The following model has been tested for compatibility. Maker: Melco Model: Buffalo 4.3 GB HDD The file system used on the DL7100 is FAT16. The DL7100 is capable of partitioning the hard disk. Therefore, for external HDDs that are greater than 2 GB, the entire hard disk space can be used by partitioning the hard disk. (Note that the maximum number of partitions is five.)
Where can you change the address of an external SCSI device?: Once you change the address of the external SCSI device, execute an "Initialize SCSI" command in the MISC/SCSI ID directory to recognize and store the changed address.
How can you connect to external media via SCSI, even if there is no media in the drive to check?: A directory of connected SCSI devices is displayed when peripherals are connected via SCSI (SC1~SCn). You can access files from both FD and external media without changing media. You can also select media from file list.
The memory for logic input is separate from the analog input. How many MW of data can the memory store? Can 8 MW be used in the interleave mode?: A maximum of 8 MW (701420, with interleave turned on). However, in the interleave mode the number of channels that can be used is reduced to half (8 bits) according to the same concept as for analog channels.
How do I select the target data for the FFT calcucation?: Use the left cursor to select the start point for the FFT. The FFT data length is User-selectable for 1K data or 10K data. The number of data points in the record, to the right of the start cursor must be equal to, or greater than, the FFT length selected.
With the Delay function of automatic parameter measurement how can I set Edge Count?: First set the start point and the end point by using the jog shuttle, and then set the Edge Count numbers for the reference waveform and the desired measurement waveform.
Does the automatic parameter measurement apply to the whole acquisition data or only displayed data?: It applies to the whole acquisition data.
What is One cycle mode?: Parameter calculation is made in the first one cycle. Though voltage axis, such as Max and RMS, targets whole range, One cycle mode targets only the first one cycle just like frequency and rising time axis.
The automatic parameter measurements take almost the same time for data of 1 K and 100 K. Why?: Because the processing of almost all parts of basic pass is done via hardware. For calculations made by software, such as Integ, it takes more time depending on the record length.
Can I manually compensate PHASE skew between channels?: YES. As PHASE is independent, not in Menu of Math, It is available for all calculations.
Is there a phase shift available when making calculations?: The Phase Shift Function is independent of the Math function. Therefore, calculations using the Math function can be performed on waveforms with the phase shifted in advance.
What is the sampling rate per second in the Envelope mode?: It is 400 MS/s when interleave mode is OFF, and 1 GS/s when the mode is ON.
Can I capture data at 1GS/s when the Interleave is ON and one of the logic input pods is active?: YES.
What is the difference between N1 and N2 in the Logic option?: N1 is for 701410 (2 MW/ch) and N2 for 701420 (8 MW/ch).
Can I display an X-Y waveform on the DL7100?: You can display one or two X-Y waveforms, XY1 and XY2.
Is it possible to adjust colors of waveforms?: Colors of waveforms, the grid, and the background are changeable in MISC menu. You can change Intensity and RGB independently.
Does the DL7100 have screen savers?: It has an ON/OFF function for Back Light.
How can I recognize channels when waveforms are overlapped?: When you push the CH key, the channel is brightened at the top.
Can I use color accumulation for waveforms saved in History memory?: YES. Set Display-Accumulate-Color and execute all-display of History Memory.
Can I enlarge a logic waveform?: When you use only one POD from PODA and PODB, you can double the waveform by selecting "ALL OFF" for either display. Although, you cannot do this at analog waveform display range.
Can I zoom in vertically?: A one-half to ten time zoom is available by selecting "Variable" in 2/2 of Channel Menu.
How do I set the Logic Trigger on the DL7100 oscilloscope?: Press the "ENHANCED" key, then press the "Type" soft key, press the "Logic" soft key and then press the "Set Pattern" soft key. You can select any of the 16 bits to "H", "L", or "X".
Is Window Trigger available?: YES. Window Trigger can be used with the OR Trigger or WIDTH Trigger. You can set pattern at IN or OUT by selecting WINDOW-ON from the men
Can the Serial Pattern Search be used on the logic input signals as well as the analog signal channels?: Any of the input signals can be used for Serial Pattern Search.
Where is the Serial Pattern Search function in the DL7100?: Press the "SHIFT" key and then the "ZOOM" key. Select "Type" soft key and then "Serial Pattern".
Can I use history research for a waveform captured by N-Single?: YES.
Can I set the logic input signals to Clock or Source when using the Serial pattern search function?: You can only set the logic input signals to Source.
Can I use the logic probe of DL700 series with DL7100?: NO. DO NOT connect the main unit and probes as both of them may get damaged.
How many power output terminals of FET probes are availble?: Four power output terminals are provided.
Can the Passive probe 700988 switch 1:1 / 10:1?: YES.
Can the 100:1 high voltage miniature probe P/N 700978 be used with the DL7100?: YES.
Why is the DL7100 passive probe's bandwidth only 400 MHz?: At frequencies above 300 or 400 MHz, the capacitive loading of a passive probe can be a significant load on the circuit under test. For best results at the higher frequencies it is best to use a FET probe which will have a much smaller capacitive load.
How do I know how much memory is being used on the DL7100?: Look just to the right of the memory bar at the top of the display.
Is a rack mount kit available?: YES.
Can I directly print out to an HP printer?: YES, if the printer accept PCL5 commands.
Is there any limitation for logic measurements?: NO. Simultaneous measurements on a total of 20 channels, 4 analog channels and 16 logic channels, are available.
Does the DL7100 work with the Optical Disk RF Signal Analyzing Software 700918: YES.

DL708E/716 ScopeCorders

When waveform labels are used, are the labels also applied to the stored data?: Yes. The labels are stored in the ASCII header file (*.hdr) of the waveform data and the header section of the file (*.asd) is saved in ASCII format. For example, if the waveform label is set to 'aaa,' then TraceName aaa is written in the header section
What is the dead time during sequential store?: Approximately 250 µs (the average of actual measured values) under the following settings: 16ch. 16 units of 701856 installed. Memory length: 1 MW. T/div: 10 ms. Sampling speed: 10 MS/s
What is the data format of the logic input waveform data saved in ASCII format? When the file is viewed using EXCEL, data are listed in one column.: 16-bit (8-bit x 2) data are taken to be one data point expressed in decimal notation. The data points are stored in one column. Convert/expand the values into binary values for viewing.
There is no information related to the linear scale in the header file (*.HDR) of waveform data (*.WVF). Why not?: On the DL series, linear scaling is already applied to the waveform data. Thus, there is no information related to linear scaling in the header file
Can't the waveform data be loaded if the type of input module that is installed is different from the input module used to measure/save the data?: The message "The Current module installation condition and the setup data are inconsistent. Will you initialize?" is displayed. The waveforms are displayed, but the channels that have different modules installed will not display the waveform correctly.
Can't the waveform data be loaded when the input module is not installed: For practical purposes, the answer is no. The channels that do not have input modules installed cannot be turned ON.Thus, even if waveform data could be loaded, the waveform cannot be displayed.
How can we save large data that do not fit on one floppy disk to multiple floppy disks? In addition, how can we copy large data on the built-in hard disk to multiple floppy disks?: Since the DL708/DL708E supports large storage media through the built-in hard disk or SCSI interface and interconnectivity with PCs, functions used to segment files for saving and copying were not included. When saving data, you can specify the range to be saved by segmenting the data with the ZOOM function. When copying data, load the data first and use the method described above.
When set-up data are saved on the DL708, what types of data are included? For example, are data such the frequency of the low pass filter saved?: All set-up conditions except the date, time, communications settings, and SCSI ID number are saved.
What is the data compatibility between the DL708 and DL708E?: It is upwardly compatible. Data measured/saved by the DL708 can be loaded by the DL708E. Data measured/saved by the DL708E cannot be loaded by the DL708.
Can the data measured on the DL708/DL708E (*.WVF or *.RTM) be loaded by the DL716? How about in the reverse direction: This is not possible. The reverse direction is not possible, either.
Is there a limitation on the number of files that can be saved automatically on the DL708?: When using the auto file function of the action trigger to create files, the upper limit of files that can be created in one directory is 999. To save files beyond this limitation, upper-level directories must be created beforehand. If the upper-level directory (DIR1, 2, N) exists, the file save operation continues by changing the directory.
Is there a restriction on the number of characters that can be used to write the user-defined equation on the DL708?: Up to 50 characters can be used.
What is the maximum frequency of the frequency distribution of the FFT result?: The frequency bandwidth of the FFT performed on the DL708 is basically 1/2 the sampling rate. In other words, the frequency bandwidth that results from taking the FFT on the acquisition data sampled at 1 MS/s is 500 kHz. However, when the anti-aliasing filter is turned ON, the frequency bandwidth becomes 1/2.5 the sampling rate.
In regards to the DL708E and DL716, are data continuously measured without dead time during the roll mode?: Data are measured continuously during the roll mode (no dead time).
Up to 512 data sets of the results of the automated measurement of waveform parameters can be saved. How can we reset the counter?: It is reset by starting the measurement with the number of waveform acquisitions set to 0 shown in the lower left corner of the screen. (The value starts at 0 when the measurement is started after changing the settings such as the T/div setting.)
What is the minimum frequency of the external clock that can be input? We would like to input a frequency of 1 Hz or less: There is no problem in inputting a signal less than or equal to 1 Hz if the pulse width is greater than or equal to 1 µs. Sampling is performed on the rising edge of the signal.
If linear scaling or position is specified on the time axis waveform, is it applied to the X-Y display?: Yes.
Memory length setting: 4 MW T/DIV: 10 µs. If data are acquired using the settings above and saved to the hard disk, can the entire record length of the loaded waveform be viewed at once? Data can be viewed by scrolling.: When the settings above are used, the display record length is 1 kW, but 4 MW of data are sampled. In this condition, the waveform cannot be reduced to display the entire display record length of data (1 MW). However, you can scroll and check the entire data.
When the T/div setting is changed on the waveform that is loaded from the floppy disk or other storage media, the display does not change. Why not?: You cannot change the T/div setting of a loaded waveform. Please use the ZOOM function for this task.
We would like to observe the input transformer waveform on the DL708. We would like to invert the waveform when we do so. Is this possible?: It depends on the module. Modules that provide the invert function (all other modules do not provide the invert function). High-speed Module High-speed Isolation Module High-Resolution Isolation Module High-Resolution High-Voltage Isolation Module.
Is there a problem in using 24 V on the DL708 external trigger input?: The external trigger supports CMOS level signals. Thus, we only guarantee the range from 0 to 5 V. There is only a slight margin provided above 5 V in terms of maximum allowable input voltage.
What is the trigger level of the external trigger input?: CMOS (0-5 V input), 1.8 V-2.5 V (typical value).
What is the type of input filter available on the high-speed isolation module 701855?: 1st order Bessel for 500 kHz; 2nd order Bessel for other frequencies.
What are the frequency characteristics of the input circuit section of the temperature module 701860?: 600 Hz (-3 dB) when the filter is OFF.
Is the built-in HD formatted at the time of shipment?: Yes, it is.
What are the DC/AC inverters (DC/AC power supply) that can be used for the DL716?: The following models have been tested for compatibility: Manufacturer: EXELTECH Inc. Model: XP250 series True sine wave AC output DC/AC inverter 250 W. Distribution in Japan: DENRYO Co., Ltd. 2-85-5 Nishi-nibbori Arakawa-ku Tokyo (Denryo Building). Note that the PROwatt series that are recommended for DL708Es cannot be used on the DL716. Due to the internal circuit used by the DL716 to control the harmonics of the power supply, inverters that output sine waves must be used for proper operation. Thus, the DL716 cannot use the PROwatt series, which output emulated sine waves.
Are there detailed specifications of the 12-bit High-speed Module (701855,56) for the DL716?: Yes, please refer to the this file.
What is the online help language used for each Suffix Code?: -HJ: English and Japanese -HG: English and German -HF: English and French -HL: English and Italian
How many directories can be created in the built-in hard disk?: The number of directories that can be created is 4096.
When using the temperature module on the DL708E or DL716 with an external clock, does it operate at the external clock speed even on the temperature module?: The maximum speed is 135 Hz. This is the same concept as with the internal clock.
Can the input modules be removed or inserted while the DL708 turned ON?: No. Always turn OFF the DL708 when removing or inserting input modules
Can the High-Speed Isolated Module 701855 and the High-Speed Module 701856 be used on the DL708/DL708E?: Yes.
What are the PCMCIA SCSI cards that have been tested for compatibility? We want to use a PC running Windows 3.1.: REX9530 by RATOC and PCSC-F by I/O Data have been tested for compatibility. The cards were tested on Windows 95 only. The use of the DL708/DL708E is restricted to Windows 95. Operations on Windows 3.1 have not been tested.
The recommended current probes 96020 and 96021 by Yokogawa M&C Corporation are battery-driven. Is there an alarm function for low battery or a way to check the remaining power?: The power lamp starts blinking when the remaining amount of power falls to approximately 10 minutes of use. There is no function provided to check the amount of power remaining.
Can't cursor measurements be performed on logic waveforms?: Yes. The cursor movement when the logic input module is used on the DL708/DL708E is as follows (this is applicable to Ver 2.03 or later.) 1) Marker cursor Only values related to the time axis (X+, Xx, dX, and 1/dX) are displayed. Y+, Yx, and dY values are not displayed (displayed as ***). The + and x markers are not displayed on logic signals. 2) H cursor All parameters are displayed as ***. 3) V cursor The cross point with the cursor is displayed in binary (01010000 11001111, for example). Parameters related to time, dX and 1/dX, are also displayed. 4) H&V cursor The V cursor here operates in the same fashion as the V cursor. The parameters of the H cursor here are not displayed (same as the H cursor). (The H cursor can be moved, but it does not affect the display in any way.)
Can data recorded in real-time to the hard disk using the DL708 be generated using the AG Series?: Yes. By saving the data recorded in real-time to the hard disk in AG format, the AG can load the data.
Can't the banana alligator measurement lead with the protective cover for the OR be used on the High-Resolution High-Voltage Isolation module and the High-Resolution Isolation Module of the DL708/DL708E?: It cannot be used as is, because the protective cover gets in the way of the terminal insertion section. However, it can be used if you remove the protective cover. In this case, the use of the measurement lead is restricted to 42 V or less. Note that the protective cover has a divot that prevents the H and L to be reversed when the cover is put back.

DL1500 Series Portable Digital Oscilloscopes

We loaded the data saved earlier for the DL1540. The measurement function cannot be used on the data. Why not?: The measurement function can be used only when data are saved in the ACQ (BIN) format. In addition, when data are saved in this format, all functions including waveform zoom can be used in the same fashion as with the captured data. When P-P data are saved, the waveform can only be displayed; measurement functions and other functions cannot be used.
When the waveform data are saved to the internal memory on the DL1540, are the data retained even if the power is turned OFF?: Yes, the data are retained using a lithium battery even if the power is turned OFF. This applies to the DL1520 Series and the DL1540 Series.
Can a large data file, too big to fit on one floppy disk, be saved on the DL1540L?: Yes. When the data do not fit on one disk, a message appears prompting you to enter the next floppy disk. Simply follow the instructions to save the data to multiple floppy disks. The same procedure also applies when loading the data. These operations are also the same for the DL1520.
Can data be saved in BMP format to the FD on models without the built-in printer on the DL1540?: Yes, screen image data can be saved in BMP and other formats even if the built-in printer is not installed.
With the DL1540, sometimes the V data in the ASCII header file for binary data (*.WVF) is in IS1 format, and other times it is in the IS2 format. Why is there a difference?: It is in the IS2 format unless the History Memory function is active, then it is in the IS1 format.
What is the data capacity when the screen image data are saved in BMP color format on the DL1540C? Is it 300 KB?: When using color, the file size ranges from 50 KB to 200 KB when Compression is turned ON. The size varies greatly since the compression rate changes depending on the density of the waveform. The file size is larger for waveforms that cover the entire display screen. When Compression is turned OFF, the size is approximately 300 KB.
Can the data measured on the DL1540 (*.WVF) be loaded by the DL1540C/DL1540CL? How about in the reverse direction?: This is not possible, because the internal circuit is not common between the two models. The reverse direction is not possible, either. Note that the data on the DL1540CL can be loaded by the DL1540C, but not vice versa.
Is color supported also when saving or transferring the screen image data on the DL1540C/CL?: Yes, you can select color or monochrome when saving or transferring the data.
Can't computation or X-Y display be performed on waveforms loaded from the FD?: There are two types of waveform data that can be loaded. Waveform data saved using P-P: Computation and X-Y display cannot be performed on P-P display waveform data that are loaded. Waveform data saved in ACQ BIN format: Computation and X-Y display are possible on this type of data.
What is the equation used for the FFT analysis on the DL1540?: It is the power spectrum defined by PS = 20 x Log(X/1Vrms)
What is the equation used to convert the displayed unit dBV of the voltage axis to V when the power spectrum is displayed on the DL1540?: If Y(V) is the converted value for X(dBV), the equation is Y = 10(X/20) (V) from X=20xlogY
We performed an FFT on the DL1540, but the result is not displayed at all. Why not?: If the FFT does not appear, check to assure that the horizontal position of the waveform is set exactly to Zero. If the horizontal position is set to a non-zero value, the FFT will not be performed.
What is the unit used on the result of the computation between channels for the DL1540?: The result of the computation between channels is displayed in units of divisions. By subtracting ch1 from ch2, you obtain 10 V. However, the result shows 2, a value obtained after dividing 10 V by the V/div value (10/5).
Is linear averaging function supported by the DL1500 Series?: The averaging function supported by the DL1500 Series is exponential averaging. The models that support linear averaging (simple averaging) are the DL4000 Series, DL2700, and DL708.
What is the dead time between the data points during sequential store for the DL1540, DL1540L? ?: The minimum dead time on the DL1540 and DL1540L is approximately 200 µs. However, this value varies depending on the T/Div setting, the number of channels, and the data length. Consider the minimum value to be the value obtained when the memory length is set to 1 KW and the T/Div is set to 1 µs/Div. For other settings, the dead time may even be a few milliseconds. Therefore, keep in mind that the value indicated above is a minimum value.
Why does the sampling rate display disappear during the FFT on the DL1500 Series?: The FFT is computed based on the ACQ data. In order to perform the FFT over 1 k points, the ACQ data are decimated (reduced) from 10 kW to 1 kW. At this point the sampling rate is equivalent to 100 ks/s (1/10 of 1 MS/s). Therefore, the sampling rate display is turned OFF. For example, to perform an FFT over the data sampled at 1 MS/s when the memory length is 10 kW, the data are decimated from 10 kW down to 1 kW. This means that the sampling rate is equivalent to 100 kS/s at this point. Therefore, to avoid misinterpretation, the sampling rate display is turned OFF. In this case, the actual sampling rate is 1 MS/s, which means that the frequency bandwidth of the time axis waveform is 500 kHz. However, because the sampling rate is reduced to 1/10 as explained above, the frequency bandwidth of the FFT is 50 kHz.
Can the color of the displayed channel be specified on the DL1540C/CL?: It is fixed. 1ch: yellow, 2ch: green, 3ch: pink, 4ch: blue.
When the position of the snapshot waveform captured on the DL1540C is moved, the waveform that was displayed in color changes to white. Is this normal?: Yes, the color of the snapshot waveform is white.
Is there any sort of data related to the durability of luminance of the LCD monitor for the DL1540C/CL?: The manufacturer of our LCDs, has given us data indicating that the luminance drops to half after 25000 hours.
Why can't the width level of the WINDOW trigger on the DL1500 Series be set below the voltage sensitivity(V/div value)?: The width level of the WINDOW trigger cannot be set to a value less than the voltage corresponding to 1 division at the specified voltage sensitivity. For example, if the voltage sensitivity is set to 500 V/div, then the width level cannot be set below 500 V. This limitation is due to the fact that the trigger sensitivity of the DL1500 Series is 1 divp-p.
Can the "external clock" and "external trigger" functions on the DL1500 Series be specified or used simultaneously?: Yes, there is no restriction on specifying or using the two functions simultaneously.
Can the screen image data on the DL1540 be transferred via the GP-IB interface?: This function is available on firmware version 1.10 and higher. To check the version, press the MISC key on the front panel. Then select "Information" using the soft keys. This function is available on all versions of the DL1540L.
We would like to clear the menu screen and message on the DL1540 from the PC, but we cannot find the appropriate command. Is there a way to do this?: The menu screen and messages are cleared when commands such as "start" and "cursor on" are issued.
We would like to transfer the data from the DL1540 to the PC via communications. Can data be transferred even when the measurement is started?: Only P-P data can be transferred in the started condition. The instrument must be stopped to transfer ACQ data.
How long does it take to transfer screen image data (TIFF, for example) from the DL1540 to the PC via GP-IB?: Up to 10 seconds. Normally, it is six or seven seconds, however this will vary depending on the performance of the PC and the GP-IB board. On the DL1540C, this may take longer than 10 s, because the screen image data contain color information. Assure that the time-out setting for the PC being used is set long enough to accomodate the required transfer time..
When we attempt to print to the built-in printer on the DL1540, error code 915 appears.: Error code 915 is the error message "Can't detect listener." This is described in the Communication Interface User's Manual. This error occurs when the hard copy destination is not set to the "printer", but to "plotter" without connecting external devices.
What is the update rate of waveform parameters on the DL1540?: It is 1 to 2 Hz when all measurement items are specified on Trace1 through Trace4. It is 5 to 6 Hz when only a few measurement items are specified on Trace1.
How long does it take after the measurement is completed to perform the GO/NO-GO determination and output the result (the falling edge of the TTL signal) on the DL1500 Series?: Approximately 500 ms when performing zone determination and Approximately 700 ms when performing parameter determination.
Is there a power selection switch in the power supply section for 100-V and 200-V systems on the DL1500 Series?: No. The power supply section of the DL1540, DL1540L, DL1540C, and DL1540CL automatically switches between 100-120 VAC and 220-240 VAC. The power supply section of the DL1520 and DL1520L is specified when you order the product. It does not have a power selector switch, and cannot be modified after the product is delivered.
Can the T/DIV knob on the DL1540 be replaced?: Yes. The part number is A9080ZG.
The pulse width of the NO-GO output of the DL1540 is approximately 20 ms in normal cases. However, the pulse width sometimes decreases to 12 ms (once or twice every 20 pulses). Why? Please tell us the conditions in which the pulse width changes.: The NO-GO output is controlled by software. Thus, there may be fluctuations in the processing time depending on the sensing conditions. Since the signal remains low until the next determination can be accepted, this means that the processing time may fluctuate at the software level depending on the conditions. In any case, the minimum pulse width of 10 ms is guaranteed.
What is the SCSI connector type that comes with the /C8 option (2.1-GB built-in HDD) on the DL1540C/CL?: Half-pitch 50-pin (pin type).
Can the TV signal output unit 700928 for the DL1540/DL1540L also be used for the DL1540C, DL1540CL?: No, it can't. As the DL1540C, DL1540CL use the color TFT LCD screen, output to the monitor is supported by the VGA output function (optional).
We connected the isolated input unit, but the DL1540 does not recognize it. Why not?: To use the isolated input unit, the firmware version of the DL1540 must be 1.10 or higher. Please check the version number. If the version number is lower than 1.10, the firmware must be upgraded.
We would like to enter comments on the DL1540. Is there a limitation on the number of characters that can be used?: You can display a comment at the top section of the waveform display frame. In this case, up to 25 characters can be entered. Up to 25 characters are also displayed. However, note that if you attempt to edit a preexisting comment, only the first nine characters are displayed. In this case, you must reenter characters after the ninth character.

DL2700 Digital Oscilloscopes

How long does it take to save data to the external MO or hard disk via the SCSI?

The performance varies depending on the firmware version. The details are shown as follows:

Saving byte data to a 230 MB MO:
1 kW:4 s 10 kW:4 s 50 kW:6 s 100 kW:7 s 250 kW:11 s 500 kW:18 s 1 MW:32 s 2 MW:59 s <4 MW:114 s
Saving word data to a 230 MB MO:
1 kW:4 s 10 kW:4 s 50 kW:6 s 100 kW :9 s
250 kW:16 s 500 kW:28 s
Saving byte data to a 1 GB hard disk:
1 kW:5 s 10 kW:5 s 50 kW:6 s 100 kW:7 s
250 kW:10 s 500 kW:16 s 1 MW:27 s 2 MW:48 s
4 MW:92 s
Saving word data to a 1 GB hard disk:
1 kW:5 s 10 kW:5 s 50 kW:7 s 100kW :8 s
250 kW:14 s 500 kW:24 s

These values are actual measured values (reference values).

Why is it that only 30 files can be saved to the floppy disk or the external MO on the DL2700? The error code 612 is displayed when we attempt to save the file.

When saving measured data or set-up data, there is a limitation on the number of files that can be saved depending on the data format. Waveform data (*.WVF) : 1000 files/directory Set-up data (*.SET) : 100 files/directory ASCII/BINARY(Float)/AG format: 30 files/directory

We would like to use data measured with the logic probe on the PC. What is the data format of the ASCII format file?

The data are saved in blocks of 8 bits expressed in decimal notation. In other words, if all 8 bits are 0s, it is 0; if all 8 bits are 1s, it is 255.

When the data were saved in ASCII format, the 2ch data were not saved. Why?

When saving to ASCII format, select the channels to be saved or select All. When channels are selected, only those channels will be saved. When All is selected, all channels are saved.

Is the data assignment the same when the logic input values are saved in ASCII format on the DL708/DL708E and the DL2700?

DL708/DL708E: The ON/OFF conditions of bit signals from A1 to A8 and B1 to B8 are expressed as a 16-digit binary value, and then converted to a decimal value. The result is saved. The value is written as a number between 0 and 65535. When all bits are ON B8 B7 B6 B5 B4 B3 B2 B1 A8 A7 A6 A5 A4 A3 A2 A0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 = 65535 (This value is saved.) DL2700: The ON/OFF conditions of bit signals from A0 to A7 are expressed as an 8-digit binary value, and then converted to a decimal value. The result is saved. This applies to B, C, and D. When all bits are ON A-0 A-1 A-2 A-3 A-4 A-5 A-6 A-7 1 1 1 1 1 1 1 1 = 255 (This value is saved.) Note that the upper bits and lower bits are reversed between DL708/DL708E and DL2700.

What is the dead time during sequential store?

Approximately 10µs.

When the "SINGLE START" key is pressed with the averaging mode enabled, the operation does not seem to stop after one measurement. Why not?

During the averaging mode, the operation of the SINGLE START key differs from the usual operation as follows: During exponential averaging: Operates in the same fashion as when the START/STOP key is pressed. The operation does not stop until the START/STOP key is pressed. During linear averaging: Stops after making measurements for the specified averaging count.

As the T/div setting is made smaller (faster sampling), the display record length becomes smaller than the record length at a certain point (interleave mode OFF, 200 MS/s and faster). Isn't the instrument measuring over the full record length?

Even when the display record length becomes smaller than the record length, measurement is made over the full record length. There is no function that allows you to move the display position to view the other parts of the waveform that is not displayed. When storing the measured data, the entire record length of data is stored. By using the Waveform Viewer for DL series, you can view the entire record length of measured data. The entire record length of measured data can also be output when transferring the data over communications. Example When the record length is set to 4 MW, the record length is also 4 MW until 2 mS/div. When the T/div setting is set to 1 mS/div, the display record length becomes 2 MW and the rest of the waveform (2 MW) cannot be observed. However, measurements are made for 4 MW of data. When the data are saved, the entire 4 MW of waveform data are stored. When the data are transferred over communications, the entire 4 MW of waveform data are also output.

When the SINGLE START key is pressed while the measurement is in progress, the measurement stops without recording any data. Why?

Since the SINGLE START key is active only when the measurement is stopped, press the SINGLE START key in the stopped condition. Pressing the SINGLE START key or the START/STOP key while the measurement is in progress stops the measurement at that point. This applies to all DL Series models that have the SINGLE START key or the START/STOP key.

What is meant by "the setup time (15 ns typical) with respect to the edge of the logic trigger"?

The amount of time by which the combination conditions of the logic input must be met before the detection of the edge trigger of the analog input. For example, the combination of conditions of logic input for the relevant edge must be met at least 15 ns before edge detection.

What is the delay time of the external trigger input? The delay time of the external trigger output is indicated in the User's Manual (50 ns max).

There is no delay, because the external trigger circuit on the DL2700 is located before the A/D converter. On the other hand, the timing is approximately 10 ns faster than the trigger captured on the measured waveform, since there are no attenuators or other circuits.

How long does it take to transfer the measured data to the PC via GP-IB?

For BINARY data 1 kW:35 ms 10 kW:180 ms 50 kW:779 ms 100 kW:1536 ms 250 kW:3812 ms 500 kW:7527 ms 1 MW:15067 ms 2 MW:30000 ms For ASCII data 1 kW:3067 ms 10 kW:30500 ms 50 kW:152 s 100 kW:335 s 250 kW:838 s 500 kW:1680 s 1 MW:3356 s Please consider these values as a reference. This is the time measured from the point at which the data transmission request command is sent by the PC to the point at which the data reception is completed. Data are not displayed on the PC. To create the data for this test, we used a Toshiba Dynabook PC, a National Instruments PCMCIA GP-IB interface, and C programming language.

A hard disk was connected to the DL2700 via the SCSI interface. When we attempted to read the data that was saved by the DL2700 using a PC, it did not work. The files that appear on the PC (Explorer) are files that were saved before the PC was connected. Files saved after the connection do not appear. The order in which the devices are connected is PC, HDD (ID1), and DL2700 (ID 2).

The following procedure will allow the hard disk to be read properly.

On Windows 95, open the "Settings" tab in the properties dialog box for the connected drive, and check the Removable box. Select "My Computer -> Control Panel -> System -> Device Manager -> Disk Drive" to access the properties of the drive.
Restart the PC.
After saving data using the DL2700, select "Refresh" on Explorer of the PC.

WT3000 Precision Power Analyzer

What is the output resolution of D/A (analog) option?

16 bits.
It has a higher resolution than other WT series instruments (the WT2000, WT1600, and other models have 12-bit resolution).

With harmonic measurement, the measured values of the fundamental wave components and bar graphs of the harmonics are not displayed. Why not?

When the selected data update cycle of the fundamental wave is shorter than the width of the analysis window determined by the fundamental frequency (cycle of the fundamental wave), measurement is not performed and no data is displayed. Change the currently selected data update rate to something longer.

For harmonic measurement of a 50 Hz distorted wave signal, the fundamental frequency is 50 Hz and the width of the analysis window is ten waves, so the data measurement interval is 200 ms. Since (data measurement interval + data computation interval) = approximately 300 ms or more, select a data update rate of 500 ms or more.

With reactive power, apparent power, and other formulas, what’s the difference between TYPE1 and TYPE2?

Selecting formulas for calculating apparent power and reactive power

There are several types of power—active power, reactive power, and apparent power.
Generally, the following equations are satisfied:
Active power P = UIcosθ (1)
Reactive power Q = UIsinθ (2)
Apparent power S = UI (3)
In addition, these power values are related to each other as follows:
(Apparent power S)2 = (Active power P)2 + (Reactive power Q)2 (4)

U: Voltage RMS
I: Current RMS
θ: Phase between current and voltage
Three-phase power is the sum of the power values in the individual phases.

These defining equations are only valid for sinewaves. In recent years, there has been an increase in measurements of distorted waveforms, and users are measuring sinewave signals less frequently. Distorted waveform measurements provide different measurement values for apparent power and reactive power depending on which of the above defining equations is selected. In addition, because there is no defining equation for power in a distorted wave, it is not necessarily clear which equation is correct. Therefore, three different formulas for calculating apparent power and reactive power are provided with the WT3000.

TYPE 1 (method used in normal mode with older WT Series models)
With this method, the apparent power for each phase is calculated from equation (3), and reactive power for each phase is calculated from equation (2). Next, the results are added to calculate the power.
Active power for three-phase four-wire connection: PΣ=P1+P2+P3
Apparent power for three-phase four-wire connection: SΣ=S1+S2+S3(=U1×I1+U2×I2+U3×I3)
Reactive power for three-phase four-wire connection: QΣ=Q1+Q2+Q3

TYPE 2
The apparent power for each phase is calculated from equation (3), and the results are added together to calculate the three-phase apparent power (same as in TYPE1). Three-phase reactive power is calculated from three-phase apparent power and three-phase active power using equation (4).
Active power for three-phase four-wire connection: PΣ=P1+P2+P3
Apparent power for three-phase four-wire connection: SΣ=S1+S2+S3(=U1×I1+U2×I2+U3×I3)
Reactive power for three-phase four-wire connection:

TYPE 3 (method used in harmonic measurement mode with WT1600 and PZ4000)
This is the only method in which the reactive power for each phase is directly calculated using equation (2). Three-phase apparent power is calculated from equation (4).
Active power for three-phase four-wire connection: PΣ=P1+P2+P3
Apparent power for three-phase four-wire connection:

Reactive power for three-phase four-wire connection: QΣ=Q1+Q2+Q3

Also, the power factor is calculated as P/S. By selecting the formula TYPE for apparent power and reactive power, the value of the three-phase total power factor λΣ also changes.

Supplement:
<TYPE 1>
This is equivalent to the normal mode formula used by the conventional WT series instruments (WT1600, WT2000, etc.).
QΣ=Q1+Q2+Q3

*s1, s2, and s3 express the polarity of Q1, Q2, and Q3 of the reactive power of each phase. When current leads or lags the voltage, it is accompanied by a “-“ sign (reactive power is a negative value), or a “+” sign (reactive power is a positive value), respectively.
QΣ is calculated from the reactive power of each phase Q1, Q2, and Q3 with the signs.
With TYPE1 there can be cases where, if the waveform is distorted, polarity determination (lead/lag is detection) may not be successful, and as a result the QΣ value may not be calculated correctly. For polarity determination, specifications such as the following are listed in the catalog.
Lead/Lag Detection in WT3000 specifications:
The phase lead and lag are detected correctly when the voltage and current signals are both sine waves, the lead/lag is 50% of the range rating (or 100% for crest factor 6), the frequency is between 20 Hz and 10 kHz, and the phase angle is ±(5°to 175°) or more.

<TYPE 2> (New mode not dependent on leading phase/lagging phase detection error)
For Type 2 the method is changed and QΣ is calculated from SΣ and PΣ, so this problem does not occur.

For example,
In order to improve the power factor as a measure against harmonic current in the switching power supply, to confirm the effect of the power factor on the current distortion waveform → TYPE1 and TYPE2 are applied.

<TYPE 3>
A mode for direct measurement of reactive power through harmonic measurement (same as WT1600 and PZ4000).
Since this mode involves harmonic measurements, measurements can be taken for each harmonic component. Since the results reflect each frequency component, the reactive power Q for each order is correct. Also, the QΣ is a simple summation so the sum of each order QΣ is also correct. The active power and reactive power of the harmonic components are computed, so the mode allows for more accurate calculation of phase information by order.

WT100/WT200 Series

What is the output resolution of the D/A (analog) option?

12 bits.

What is the approximate response time of the D/A (analog) output for the WT100/WT200 Series?

The response time during normal measurement is 0.5 s (max.), which is the display update interval x 2.

What is the response time when acquiring measurement values via RS232C?

With RS232C, the response time depends on settings other than the communications speed. An actual measurement example is given below at 1 byte=10 bits (start bit: 1 bit, data: 8 bits, stop bit: 1 bit, no parity) with a speed of 9600 bps.

Example

After receiving the "OD" command (request data transmission), the time until 14 data items (corresponding to 261 bytes) were output was 292 ms (the time for the PC to display and store the data depends on the PC's performance, and was therefore not included in the 292 ms).

Can the setting values for the comparator function (optional) on the WT100/200 be stored in internal memory?

Yes, using instruments with firmware version 1.21 or later. You can check the version in the opening message when you first turn the power ON.

When the harmonic analysis function is ON, FrqEr appears in display B and I can't perform harmonic analysis. What causes this?

This error occurs when the PLL source frequency is outside of the measurement range. The measuring frequency range for the PLL source is 40 Hz to 440 Hz. You can select voltage or current for the PLL source. Select a stable signal that has as little distortion and noise as possible.

I can't output the D/A (analog) output of the VFrq (voltage frequency) and AFrq (current frequency) correctly.

In the D/A output setting menu, the VFrq and AFrq of element 1 are set to output.
When the V Hz display function indicator is lit in display C, the voltage frequency is output (D/A output).
When the A Hz display function indicator is lit in display C, the current frequency is output (D/A output).
When a display function other than V Hz or A Hz is selected in display C, the voltage and current frequency are not output.
We are performing measurement on a 3V3A wiring circuit with the 253503.

The frequency display and D/A output can handle only one input element at a time, either the voltage or the current. When either the V Hz or A Hz display function indicators are lit in display C, the frequency corresponding to the lit function indicator will be output. When neither of them are lit, the frequency of the last used function and element indicators shown in display C will be output.

Would any problems arise if I wired the current input to both the direct input terminal and external sensor input terminal?

You should not use the instrument with both the direct input and external sensor terminals wired. There would be a risk of electric shock or damage to the instrument since the external sensor input terminal's Lo side, and the Lo side (+/- terminal side) of the current input terminal for direct input would both be at the same electric potential. When inputting a measurement signal to the direct input terminal, you must remove the shunt connected to the external sensor input terminal, and the current sensor.

Is it possible to alter the standard model to a custom specification for the current input range?

No, but it is possible for the following models:

Current range 1/10 model: WT1010/WT1030/WT1030M/WT2010/WT2030
Current range 100 A model: WT1010/WT1030/WT1030M

WT1000 Series

What is the output resolution of the D/A (analog) option?

12 bits.

I'm thinking of connecting the output of the Clamp Probe (Model 751550) to the external shunt input terminal on a WT1000/WT2000 Series instrument. What kind of terminal does the external shunt input use?

A BNC terminal. The output terminal on the Clamp Probe (Model 751550) is a banana plug. Use the Banana-to-BNC Conversion Adapter (Model 366921, sold separately) to connect to the external shunt input terminal.

Is it possible to alter the standard model to a custom specification for the current input range?

Yes, this is possible. The following are the range standard special order specifications and corresponding models.

Current range 1/10 model: WT1010/WT1030/WT1030M/WT2010/WT2030
Current range 100 A model: WT1010/WT1030/WT1030M

WT2000 Series

What is the output resolution of the D/A (analog) option?

12 bits.

A BNC connector. The output terminal on the Clamp Probe (Model 751550) is a banana plug. Use the Banana-to-BNC Conversion Adapter (Model 366921, sold separately) to connect to the external shunt input terminal

How much time is required to print using the internal printer when performing harmonic analysis? I want to know the times for up to the 25th and 50th orders.

Output function: HAr
When the default output item is set to 1, the printout time for up to the 50th order is about 116 seconds. The printout time for up to the 25th order is about 75 seconds.

Output function: HAr
When the default output item is set to 2, the printout time for up to the 50th order is about 41 seconds. The printout time for up to the 25th order is about 27 seconds.

Can the width of the harmonic analysis window be increased beyond 16?

In order to analyze the harmonics by the PLL synchronization, the maximum possible window width is automatically determined depending on the frequency of the fundamental wave of the input signal (fundamental frequency f).

When the fundamental frequency f of the input signal is 40 =/< f < 70 Hz, the width cannot be set higher than 16.

The following are the settings possible given different fundamental frequencies f:
10 =/< f < 20 Hz: 1 to 4
20 =/< f < 40 Hz: 1 to 8
40 =/< f < 70 Hz: 1 to 16
70 =/< f < 130 Hz: 1 to 32
130 =/< f < 250 Hz: 1 to 64
250 =/< f =/< 440 Hz: 1 to 128

Is it possible to alter the standard model to a custom specification for the current input range?

Yes, this is possible. The following are the range standard special order specifications and corresponding models.

Current range 1/10 model: WT1010/WT1030/WT1030M/WT2010/WT2030
Current range 100 A model: WT1010/WT1030/WT1030M

PZ4000 Power Anlyzer

Waveform data from the PZ4000 can be saved in ASCII or waveform format. How do I analyze data in waveform format?

You can use the Power Viewer (Model 253734) software. However if you only need to view waveforms, we recommend you use the Waveform Viewer (Model 700919, version 1.23 or later) software for YOKOGAWA DL series digital oscilloscopes.

The trial version of the Power Viewer is available with limited functionality.
You can download the latest update for the retail version of the Waveform Viewer from our web site.

What is the display update rate for the PZ4000?

The display update rate is shown below for observation times from 2 ms to 100 ms. Please reference the following values which were taken from actual measurements.

2 ms : 0.8 s
4 ms : 0.9 s
10 ms : 1.2 s
20 ms : 1.8 s
40 ms : 1.8 s
100 ms : 1.8 s

Measurement Conditions

Modules mounted : three Power Measurement Modules
(Model 253752)
Measurement mode : normal
Numeric computation : ON
Waveform math : OFF
Record length : 100 kwords

When the measurement mode is Normal, the display update rate changes depending on the observation time and certain settings such as ones related to MATH functions. When in harmonic measurement mode, the display update rate changes depending on the entered record length, and the fundamental frequency of the PLL source.
The PZ4000 samples signals to be measured at a high sampling rate. Because of this, it can capture waveforms of signals with deep fluctuations. Also, it reads sampled data into memory so it can compare numeric measurement data with acquired signal waveforms and analyze the signal's characteristics. However, unlike other power meters to date, the PZ4000 is not designed to perform continuous measurement at regular display update intervals.

Communications for WT Series and PZ4000

For the PZ4000 I was able to read out specific items using the procedure in A1 and A2. However, if data is read out from the measuring instrument repeatedly then the same data is read over and over until it is updated. Is there a way to make it so that it only reads out when the data is updated?

You can use the "STATUS:ESSR?" command to access the extended event register and determine whether the data was updated.
You can judge the data update status by referencing bit 1 (DAV) of this register.

However to do so, you must use the status register and transition filter in addition to the extended event register.

The status register (also called the condition register) is a 16-bit register providing information about the instrument. Its 1st bit is set to 0 between calculation and updating of measured data, and is set to 1 when data updating is complete.
The update period is the timing in which value switches from 0 to 1.

Changes in each bit of the transition filter and status register are detected and the results are stored in the extended event register.

The transition filter is set so that when data is updated (bit 1 of the status register changes from 0 to 1) bit 1 of the extended event register is set to 1.
Send the "STATUS:FILTER2 RISE" communications command, and set FILTER2 (the filter corresponding to bit 1 of the status register) so that when bit 1 of the status register "RISES" from 0 to 1, bit 1 of the extended event register is set.
Bit 1 is the status register's data update bit, but the filter uses bit 2.
Note that the filter's bits are numbered starting from 1 instead of 0.

This setting makes it so that bit 1 of the value returned by the "STATUS:EESR?" command is set to 1 every time the measured value is updated.
"STATUS:EESR?" is what is reset, and only when the value of this register is read out.
Therefore, even if you suddenly read the extended event register and determine that bit 1 is set to 1, this does not indicate at what time the update occurred.
Therefore, send a dummy "STATUS:EESR?" command, and clear the contents of the extended event register.
Then issue repeated "STATUS:EESR?" commands, confirm the changing of the returned value's bit 1 to 1. Then if you send the "NUMERIC:NORMAL:VALUE?" command, the data is not read out until it is updated.

For information on the extended event register, status register, and transition register, see the following:

PZ4000 Power Analyzer Communications Interface User's Manual
Page 5-4

How can I read out measured data using communications in normal mode?

Send the appropriate command as shown below to your instrument, then read in all the data that is returned.
    PZ4000: "NUMERIC:NORMAL:VALUE?"
    WT1600: "NUMERIC:NORMAL:VALUE?"

    WT100/200 series instruments:
        Command type prior to IEEE488.2: "OD"
        Command type for IEEE488.2: "MEASURE:NORMAL:VALUE?"
    WT1000/2000 series instruments:
        Command type prior to IEEE488.2: "OD"
        Command type for IEEE488.2: "MEASURE:VALUE?"

Note
If you use pre-IEEE488.2 command types, the measuring instrument will respond to the "OD" command by writing multiple lines including the "END" line, and returning them one by one as they are requested.

Therefore after sending the "OD" command, lines must be read out repeatedly until the "END" string is received.

See the user's manual for your instrument for more information about the format of returned data from the various commands.

PZ4000 Power Analyzer Communications Interface User's Manual Page 4-65
WT1600 Digital Power Analyzer Communications Interface User's Manual Page 4-70
WT1010 Digital Power Meter User's Manual Pages App 1-14 through 1-16, and App 2-31 through 2-32
WT1030/1030M Digital Power Meter User's Manual Pages App 1-16 through 1-18, and App 2-31 through 2-33
WT2010 Digital Power Meter User's Manual Pages App 1-18 through 1-20, and App 2-39 through 2-40
WT2030 Digital Power Meter User's Manual Pages App 1-18 through 1-20, and App 2-39 through 2-41
WT110E/WT130 Digital Power Meter User's Manual Pages 11-4 through 11-6, and App 2-23 through 2-25
WT200 Digital Power Meter User's Manual Pages 10-5 through 10-8, and 14-28 through 14-30
WT210/230M Digital Power Meter User's Manual Pages 10-5 through 10-8, and 14-31 through 14-33

For WT1000/2000 Series Instruments When Using Pre-IEEE488.2 Command Types I was able to read in measured data following the procedure in A1, but it wouldn't output the exact data I needed. The data I want read out is V, A, and W on element 1. Can I have it read out only specific items?

First, send the "OFDO" command. This command turns all items for output OFF. Therefore no items will be output if you send the "OD" command.
Next, send the "OF1,1" command to the measuring instrument. This command turns the voltage value (V) from element 1 ON, so that the voltage on element 1 will be read out.
In the same manner, send the "OF2,1" and "OF3,1" commands to turn ON the current value (A) and power value (W) output from element 1.
For details on the "OF" command, see the following:
- WT1010 Digital Power Meter User's Manual Page App1-8
- WT1030/WT1030M Digital Power Meter User's Manual Pages App1-9 through App1-10
- WT2010 Digital Power Meter User's Manual Pages App1-10 through App1-11
- WT2030 Digital Power Meter User's Manual Page App1-11
Now if you send "OD" and read out the measured data, 3 data are output as shown in the following example. Example Output: V 1N 004.083E+0,A 1N 050.008E+0,W 1N 0202.69E+0 In the example, the first data (004.083E+0) is the V value on element 1, the next data (050.008E+0) is the A value on element 1, and the last data (0202.69E+0) is the W value from element 1.
The "V….1N" portion before each value is called the header, and expresses, from left to right, the measurement function, element, and data condition. For details on the data output format, see the following:
- WT1010 Digital Power Meter User's Manual Pages App1-14 through App1-16
- WT1030/WT1030M Digital Power Meter User's Manual Pages App1-16 through App1-18
- WT2010 Digital Power Meter User's Manual Pages App1-18 through App1-20
- WT2030 Digital Power Meter User's Manual Pages App1-18 through App1-20

For WT1000/2000 Series Instruments When Using Pre-IEEE488.2 Command Types How can I update the range on the measuring instrument using communications?

There are both voltage and current ranges.
For example, to change the voltage range on element 1 to the 30 V range, send the "RV1,4" command to the measuring instrument.
For example, to change the current range on element 1 to the 1 A range, send the "RA1,5" command to the measuring instrument.

For information on the correspondence between voltage values, current values, and parameters, see the following:

WT1010 Digital Power Meter User's Manual
Page App1-11
WT1030/WT1030M Digital Power Meter User's Manual
Page App1-13
WT2010 Digital Power Meter User's Manual
Pages App1-14 and App1-15
WT2030 Digital Power Meter User's Manual
Page App1-15

    *After entering settings, confirm the settings by sending the following commands:
    To query the voltage on element 1: "RV1?"
    To query the current on element 1: "RA1?"

    (Supplement)
    To set the ranges on all elements at once, use the following commands:

Voltage global setting
"RV0,4"
Current global setting
"RA0,5"

For the PZ4000 and WT1600 I was able to read in measured data following the procedure in A1, but it wouldn't output the exact data I needed. The data I want read out is V, A, and W on element 1. Can I have it read out only specific items?

First, set the data format for the data you want to read out. Send the "NUMERIC:FORMAT:ASCII" command to the measuring instrument. By sending this command, measured data read out using the "NUMERIC:NORMAL:VALUE?" command is output as an ASCII string.
Send the "NUMERIC:NORMAL:CLEAR:ALL" command to the measuring instrument. This command turns all items for output OFF. Therefore no items will be output if you send the "NUMERIC:NORMAL:VALUE?" command.
Next, send the "NUMERIC:NORMAL:ITEM1 URMS" command. This command sets item 1 of the data that is output using "NUMERIC:NORMAL:VLAUE?" to element 1's voltage RMS value (Urms) output.
In the same manner, you can send "NUMERIC:NORMAL:ITEM2 IRMS,1", and "NUMERIC:NORMAL:ITEM3 P,1" to set the second and third data to the current RMS value (Irms) and power value (P) output.
Use the following commands to enter the number of parameters to be read out by the "NUMERIC:NORMAL:VALUE?" command. (In this case, Urms, Irms, and P will be read out, so there are three parameters.) "NUMERIC:NORMAL:NUMBER 3"
Now if you send "NUMERIC:NORMAL:VALUE?" and read out the measured data, 3 data are output as shown in the following example.
Example Output: 4.083E+00,50.002E+00,202.65E+00

In steps 3 and 4 above, output items ("NUMERIC:NORMAL:ITEM"), Urms, Irms, and P are set to the 1st, 2nd, and 3rd data respectively, so in the example the first data (4.083E+00) is the Urms on element 1, the next data (50.002E+00) is Irms on element 1, and the last data (202.65E+00) is P on element 1.

(Supplement) In the above procedure using "NUMERIC:NORMAL:ITEM" you set each output item individually, but you can also specify all output items at once using a preset pattern. There are 4 preset patterns that can be used. For example, to use preset pattern, send the "NUMERIC:NORMAL:PRESET1" command to the measuring instrument.
For information on preset output item patterns, see the following:

PZ4000 Power Analyzer Communications Interface User's Manual Page 4-66 to 4-67
WT1600 Digital Power Analyzer Communications Interface User's Manual Page 4-70 to 4-71

You can also use preset pattern 1 to output Urms, Irms, and P as follows: Send the following 4 commands in order to the measuring instrument.

"NUMERIC:FORMAT ASCII"
"NUMERIC:NORMAL:PRESET 1"
"NUMERIC:NORMAL:NUMBER 3"
"NUMERIC:NORMAL:VALUE?"

When using a preset and there are a large number of items to be output, first, choose the closest preset pattern, then add a "NUMERIC:NORMAL:ITEM" command for each remaining item.

For WT1000/2000 Series Instruments When Using IEEE488.2 Command Types I was able to read in measured data following the procedure in A1, but it wouldn't output the exact data I needed. The data I want read out is V, A, and W on element 1. Can I have it read out only specific items?

First, send the "MEASURE:ITEM:NORMAL:PRESET:CLEAR" command to the measuring instrument. This command turns all items for output OFF. Therefore no items will be output if you send the "MEASURE:VALUE?" command.
Next, send the "MEASURE:ITEM:NORMAL:V:ELEMENT1 ON" command. This command turns the voltage value (V) from element 1 ON, so that the voltage on element 1 will be read out.
In the same manner, send the "MEASURE:ITEM:NORMAL:A:ELEMENT1 ON" and " MEASURE:ITEM:NORMAL:W:ELEMENT1 ON" commands to turn ON the current value (A) and power value (W) output from element 1.
Now if you send "MEASURE:VALUE?" and read out the measured data, 3 data are output as shown in the following example.

Example Output: 4.083E+00,50.002E+00,202.65E+00

WT1010 Digital Power Meter User's Manual Page App2-32
WT1030/WT1030M Digital Power Meter User's Manual Page App2-32
WT2010 Digital Power Meter User's Manual Page App2-40
WT2030 Digital Power Meter User's Manual Page App2-40

"Output Format for Normal Measurement Mode," shows that the order of data output is: V1, A1, W1 etc. Therefore in the example, the first data (4.083E+00) is V1, the next data (50.002E+00) is A1, and the last data (202.65E+00) is W1.

(Supplement)

In the "MEASURE:ITEM:NORMAL:PRESET XXX" communications command which was sent first, ALL, DEFAULT1, and DEFAULT2 are available in addition to CLEAR, so you can output only the specified items of the measured values. Also, for example, if you want to output the VA item in addition to "DEFAULT1," you can send "MEASURE:ITEM:NORMAL:PRESET DEFAULT1", then send "MEASURE:ITEM:NORMAL:VA:ELEMENT1 ON" to add it to the DEFAULT1 item. On the other hand, if you want to remove W on element 1 from the "DEFAULT1" setting item, you can send "MEASURE:ITEM:NORMAL:PRESET DEFAULT1", then send "MEASURE:ITEM:NORMAL:W:ELEMENT1 OFF." In this way you can specify individual items for output by adding output items to or taking output items away from the CLEAR, ALL, DEFAULT1, and DEFAULT2 preset settings.

For WT100/200 Series Instruments When Using Pre-IEEE488.2 Command Types I was able to read in measured data following the procedure in A1, but it wouldn't output the exact data I needed. The data I want read out is V, A, and W on element 1. Can I have it read out only specific items?

First, send the "OF1,1,1" command. This command sets the voltage value (V) from element 1 to output to channel 1 (from among the 14 output channels), and causes the voltage of element 1 to be read out.
In the same manner, make the current (A) and power (W) on element 1 output to channels 2 and 3 respectively by sending the "OF2,2,1" command to the measuring instrument.
Next, turn the output on channels 4 through 14 OFF by sending the following commands: "OF4,0,1"?"OF5,0,1"?"OF6,0,1"?"OF7,0,1"?"OF8,0,1"?"OF9,0,1"? "OF10,0,1"?"OF11,0,1"?"OF12,0,1"?"OF13,0,1"?"OF14,0,1"
For details on the "OF" command, see the following:
- WT110E/WT130 Digital Power Meter User's Manual Page App1-5
- WT200 Digital Power Meter User's Manual Page 13-6 to 13-7
- WT210/230M Digital Power Meter User's Manual Page 13-8
Now if you send "OD" and read out the measured data, 3 data are output as shown in the following example. Example Output: V 1N 004.083E+0,A 1N 050.008E+0,W 1N 0202.69E+0
In the example, the first data (004.083E+0) is the V value on element 1, the next data (050.008E+0) is the A value on element 1, and the last data (0202.69E+0) is the W value from element 1. The "V….1N" portion before each value is called the header, and expresses, from left to right, the measurement function, element, and data condition.
For details on the data output format, see the following:
- WT110E/WT130 Digital Power Meter User's Manual Page 11-4
- WT200 Digital Power Meter User's Manual Page 10-5
- WT210/230M Digital Power Meter User's Manual Page 10-5
For WT100/200 Series Instruments When Using IEEE488.2 Command Types
1. First, send the "MEASURE:NORMAL:ITEM:PRESET:CLEAR" command to the measuring instrument. This command turns all items for output OFF. Therefore no items will be output if you send the "MEASURE:NORMAL:VALUE?" command.
2. Next, send the "MEASURE:NORMAL:ITEM:V:ELEMENT1 ON" command. This command turns the voltage value (V) from element 1 ON, so that the voltage on element 1 will be read out.
3. In the same manner, send the "MEASURE:NORMAL:ITEM:A:ELEMENT1 ON" and " MEASURE:NORMAL:ITEM:W:ELEMENT1 ON" commands to turn ON the current value (A) and power value (W) output from element 1.
4. Now if you send "MEASURE:NORMAL:VALUE?" and read out the measured data, 3 data are output as shown in the following example.
  Example Output: 4.083E+00,50.002E+00,202.65E+00
  - WT110E/WT130 Digital Power Meter User's Manual Page App2-24
  - WT200 Digital Power Meter User's Manual Page 14-29
  - WT210/230M Digital Power Meter User's Manual Page 14-32
  Looking at "Output Format for Normal Measured Data," you can see the following: 1. V1 -> V2 -> V3 -> VΣ 2. A1 -> A2 -> A3 -> AΣ 3. W1 -> W2 -> W3 -> WΣ ... MATH
  This indicates the order in which data was output. In this case, element 1's V, A, and W values are set for output, so V1, A1, and W1 are output in the order V1 > A1 > W1. Going back to the output examples, the first data (4.083E+00) is V1, the next data (50.002E+00) is A1, and the last data (202.65E+00) is W1.

(Supplement)
In the "MEASURE:NORMAL:ITEM:PRESET XXX" communications command which was sent first, NORMAL and INTEGRATE are available in addition to CLEAR, so you can output only the specified items of the measured values. Also, for example, if you want to output the VA item in addition to "NORMAL," you can send "MEASURE:NORMAL:ITEM:PRESET NORMAL", then send "MEASURE:ITEM:VA:ELEMENT1 ON" to add it to the NORMAL item. On the other hand, if you want to remove W on element 1 from the "NORMAL" setting item, you can send "MEASURE:NORMAL:ITEM:PRESET NORMAL", then send "MEASURE:ITEM:W:ELEMENT1 OFF." In this way you can specify individual items for output by adding output items to or taking output items away from the CLEAR, NORMAL, and INTEGRATE preset settings.

For Instruments Other Than the PZ4000 When Using Pre-IEEE488.2 Command Types I was able to read out specific items using the procedure in A1 and A2. However, if data is read out from the measuring instrument repeatedly then the same data is read over and over until it is updated. Is there a way to make it so that it only reads out when the data is updated?

You can determine whether data was updated by performing a serial poll and referencing the status byte.

Bit 0 of the status byte (D101) changes to 1 when data is updated.
When bit 0 changes to 1, bit 6 (D107) also changes to 1.
Also, bit 0 and 6 are reset when a serial poll is performed.
You can judge the data update status by referencing bit 0 and bit 6.

However, even if you suddenly read the status byte and determine that bit 0 and bit 6 are set to 1, this does not indicate at what time the update occurred.
Therefore, perform a dummy serial poll, and clear the contents of the extended event register.
Then perform repeated serial polls, and confirm the changing of the returned value's bit 0 and bit 6 to 1. Then if you send the "OD" command, the data is not read out until updated.

For details on the status byte, see the following:

WT1010 Digital Power Meter User's Manual
Page App1-13
WT1030/1030M Digital Power Meter User's Manual
Page App1-15
WT2010 Digital Power Meter User's Manual
Page App1-17
WT2030 Digital Power Meter User's Manual
Page App1-17
WT110E/WT130 Digital Power Meter User's Manual
Page 11-3
WT200 Digital Power Meter User's Manual
Page 10-4
WT210/230M Digital Power Meter User's Manual
Page 10-4

For Instruments Other Than the PZ4000 When Using IEEE488.2 Command TypesM I was able to read out specific items using the procedure in A1 and A2. However, if data is read out from the measuring instrument repeatedly then the same data is read over and over until it is updated. Is there a way to make it so that it only reads out when the data is updated?

You can use the "STATUS:ESSR?" command to access the extended event register and determine whether the data was updated.
You can judge the data update status by referencing bit 0 (UPD) of this register.

However to do so, you must use the status register and transition filter in addition to the extended event register.

The status register (also called the condition register) is a 16-bit register providing information about the instrument. Bit 0 of this register is set to 1 during measurement and is set to 0 when data updating is complete.
The update period is the timing in which value switches from 1 to 0.

Changes in each bit of the transition filter and status register are detected and the results are stored in the extended event register.

The transition filter is set so that when data is updated (bit 0 of the status register changes from 1 to 0) bit 0 of the extended event register is set to 1.
Send the "STATUS:FILTER1 FALL" communications command, and set FILTER1 (the filter corresponding to bit 0 of the status register) so that when bit 0 of the status register "FALLS" from 1 to 0, bit 0 of the extended event register is set.
Bit 0 of the bottom-most bit is the status register's data update bit, but the filter uses bit 1.
Note that the filter's bits are numbered starting from 1 instead of 0.

This setting makes it so that bit 0 of the value returned by the "STATUS:EESR?" command is set to 1 every time the measured value is updated.
"STATUS:EESR?" is what is reset, and only when the value of this register is read out.
Therefore, even if you suddenly read the extended event register and determine that bit 0 is set to 1, this does not indicate at what time the update occurred.
Therefore, send a dummy "STATUS:EESR?" command, and clear the contents of the extended event register.
Then issue repeated "STATUS:EESR?" commands, and confirm the changing of the returned value's bit 0 to 1. Then, data is not read out until updated

For information on the extended event register, status register, and transition register, see the following:

WT1600 Digital Power Analyzer Communications Interface User's Manual
Page 5-4
WT1010 Digital Power Meter User's Manual
Page App2-47
WT1030/1030M Digital Power Meter User's Manual
Page App2-51
WT2010 Digital Power Meter User's Manual
Page App2-58
WT2030 Digital Power Meter User's Manual
Page App2-59
WT110E/WT130 Digital Power Meter User's Manual
Page App2-38
WT200 Digital Power Meter User's Manual
Page 14-44
WT210/230M Digital Power Meter User's Manual
Page 14-47

For the PZ4000 and WT1600 How can I update the range on the measuring instrument using communications?

There are both voltage and current ranges.
For example, to change the voltage range on element 1 to 30 V, send the "INPUT:VOLTAGE:RANGE:ELEMENT1 30V" command to the measuring instrument.
For example, to change the current range on element 1 to the 1 A range, send the "INPUT:CURRENT:RANGE:ELEMENT1 1A" command to the measuring instrument.

For information on the voltage and current values that can be set using these commands, see the following:

PZ4000 Power Analyzer Communications Interface User's Manual
Pages 4-48 and 4-52
WT1600 Digital Power Analyzer Communications Interface User's Manual
Pages 4-49 and 4-53

    *After entering settings, confirm the settings by sending the following commands:
    To query the voltage on element 1: "INPUT:VOLTAGE:RANGE:ELEMENT1?"
    To query the current on element 1: "INPUT:CURRENT:RANGE:ELEMENT1?"

    (Supplement)
    To set/query the ranges on all elements at once, use the following commands:

Voltage global setting
"INPUT:VOLTAGE:RANGE 30V"
Voltage global query
"INPUT:VOLTAGE:RANGE?"
Current global setting
"INPUT:CURRENT:RANGE 1A"
Current global query
"INPUT:CURRENT:RANGE?

For WT1000/2000 Series Instruments When Using IEEE488.2 Command Types How can I update the range on the measuring instrument using communications?

There are both voltage and current ranges.
For example, to change the voltage range on element 1 to 30 V, send the "CONFIGURE:VOLTAGE:RANGE:ELEMENT1 30V" command to the measuring instrument.
For example, to change the current range on element 1 to the 1 A range, send the "CONFIGURE:CURRENT:RANGE:ELEMENT1 1A" command to the measuring instrument.

For information on the voltage and current values that can be set using these commands, see the following:

WT1010 Digital Power Meter User's Manual
Pages App2-20 and App2-22
WT1030/WT1030M Digital Power Meter User's Manual
Pages App2-20 and App2-22
WT2010 Digital Power Meter User's Manual
Pages App2-21 and App2-23
WT2030 Digital Power Meter User's Manual
Pages App2-21 and App2-23

    *After entering settings, confirm the settings by sending the following commands:
    To query the voltage on element 1: "CONFIGURE:VOLTAGE:RANGE:ELEMENT1?"
    To query the current on element 1: "CONFIGURE:CURRENT:RANGE:ELEMENT1?"

    (Supplement)
    To set/query the ranges on all elements at once, use the following commands:

Voltage global setting
"CONFIGURE:VOLTAGE:RANGE 30V"
Voltage global query
"CONFIGURE:VOLTAGE:RANGE?"
Current global setting
"CONFIGURE:CURRENT:RANGE 1A"
Current global query
"CONFIGURE:CURRENT:RANGE?"

For WT100/200 Series Instruments When Using Pre-IEEE488.2 Command Types How can I update the range on the measuring instrument using communications?

There are both voltage and current ranges.
For example, to change the voltage range on element 1 to 30 V, send the "CONFIGURE:VOLTAGE:RANGE 30V" command to the measuring instrument.
For example, to change the current range on element 1 to the 1 A range, send the "CONFIGURE:CURRENT:RANGE 1A" command to the measuring instrument.

For information on the voltage and current values that can be set using these commands, see the following:

WT110E/WT130 Digital Power Meter User's Manual
Pages App2-15 and App2-16
WT200 Digital Power Meter User's Manual
Pages 14-19 and 14-20
WT210/230M Digital Power Meter User's Manual
Pages 14-20 and 14-21

    *After entering settings, confirm the settings by sending the following commands:
    To query the voltage: "CONFIGURE:VOLTAGE:RANGE?"
    To query the current: "CONFIGURE:CURRENT:RANGE?"

For WT100/200 Series Instruments When Using IEEE488.2 Command Types How can I update the range on the measuring instrument using communications?

There are both voltage and current ranges.
For example, to change the voltage range on element 1 to the 30 V range, send the "RV4" command to the measuring instrument.
For example, to change the current range on element 1 to the 1 A range, send the "RA5" command to the measuring instrument.

For information on the correspondence between voltage values, current values, and parameters, see the following:

WT110E/WT130 Digital Power Meter User's Manual
Page App1-8
WT200 Digital Power Meter User's Manual
Pages 13-9 and 13-10
WT210/230M Digital Power Meter User's Manual
Pages 13-11 and 13-12

    *After entering settings, confirm the settings by sending the following commands:
    To query the voltage: "RV?"
    To query the current: "RA?"

Power Measurement Instruments, General

When measuring a sine wave but the RMS and MEAN values are not right

A. The waveform may actually not be a pure sine wave.

Applicable Models:

WT110 WT200 WT210	WT130 WT230	WT1010 WT1030 WT1030M	WT1600	WT2010 WT2030	PZ4000	WT3000

Explanation:

Even though a 50/60 Hz sine wave is expected, the following factors may be involved:

The waveform is slightly distorted (harmonic components are mixed in)
Small amounts of harmonic noise are superimposed on the waveform
DC offset is superimposed on the waveform.

Unstable measured values of voltage, current, and power

A. Check the "Sync Source" and zero cross filter (frequency filter) settings.

Applicable Models:

WT110 WT200 WT210	WT130 WT230	WT1010 WT1030 WT1030M	WT1600	WT2010 WT2030	PZ4000	WT3000
						*

*For data update rates of 50 ms, 100 ms, 5 s, 10 s, or 20 s.
"Sync Source" setting is irrelevant if the data update rate is 250 ms, 500 ms, 1 s, or 2 s.

Explanation:

Sync Source Setting
In principle, if the AC signal is is not averaged over an interval synchronized with the cycle of the signal, a correct measurement cannot be obtained. For the applicable models listed above, the synchronous source determines the interval at which the cycle of the signal is detected and calculated. You should make a determination from the voltage and current waveforms as to whether to set the "Sync Source" to voltage or current.

Detection of the input waveform's period is made using a comparator (zero cross detector) referencing the center of the waveform's amplitude. Be sure to select a waveform for the "Sync Source" that: is nearly sinusoidal, has little harmonic distortion, and that has minimal jitter around the zero cross point (center of the waveform amplitude).

For example, with inverter motors and other such devices, current should be used since it is closer to sinusoidal than voltage which is a PWM waveform, but for commercial frequencies the voltage signal is often an ideal sine wave, so you should select voltage.
For inverters and other such devices, harmonic components are also included in the current, and sometimes the period cannot be detected accurately. In such cases, set the zero cross filter.

The zero cross filter (frequency filter) rejects components equal to or higher than the cutoff frequency, resulting in accurate period detection. The filter cutoff frequency for the WT210, 230, 1600, and PZ4000 is 500 Hz.
*The zero cross filter does not affect the measured values.

<Checking the suitability of the "Sync Source" setting>
For frequency measurement, check whether the fundamental wave of the item set to the sync source can be accurately measured.

Voltage, current, and power values measured on power meter A do not match those from power meter B

A. Check for differences in the specifications or features of the instruments.

Applicable Models:

WT110 WT200 WT210	WT130 WT230	WT1010 WT1030 WT1030M	WT1600	WT2010 WT2030	PZ4000	WT3000
						*

Explanation:

Values do not match when inputting a 50/60 Hz sine wave.

Check whether the value is within the specifications (error) of each power meter.

Also, if the measuring range is too large relative to the input signal, the amount of error will increase.

Check whether the measuring range is set appropriately.

Differences in measured values can occur due to DC offset and other effects on AC power meters and AC/DC power meters.

Check the DC offset in DC mode.

If the waveform is subtly distorted, harmonic components are present. The effects of such harmonic components can cause differences in measured values between power meters dedicated for 50/60 Hz and power meters supporting harmonics. Check whether your power meters have harmonic measurement functions.
Values do not match when inputting distorted waves or high frequency waves

Distorted waves include high frequency components.
Check whether the value is within the specifications (error) of the high frequency input of each power meter.

If the measured values on power meter A are larger than those from power meter B, there are at least two possibilities:
The frequency characteristic (bandwidth) of power meter A is higher (frequencies are attenuated on power meter B).
Power meter B has superior common mode (voltage) rejection ratio characteristics.

Unstable measured values of efficiency when measuring at I/O efficiency from input power ΣA and output power ΣB to and from the instrument

A. The measurement intervals of the measured I/O data must overlap exactly.
Check the sync source setting.

Applicable Models:

WT110 WT200 WT210	WT130 WT230	WT1010 WT1030 WT1030M	WT1600	WT2010 WT2030	PZ4000	WT3000
						*

*For data update rates of 50 ms, 100 ms, 5 s, 10 s, or 20 s.
"Sync Source" setting is irrelevant if the data update rate is 250 ms, 500 ms, 1 s, or 2 s

Explanation:

"Sync Source" Setting
For example, route the input to a three-phase device under measurement to input elements 1-3 on the power meter, and the output to elements 4-6. Set the sync source on elements 1-3 to the current or voltage of element 1 (I1 or U1), and the sync source on elements 4-6 to the voltage or current of element 4 (U4 or I4).

In a case when inputting three phases to elements 1-3 and DC to element 4, set all sync sources to current or voltage of element 1 (I1 or U1).

For instructions on setting the "Sync Source", see Q1. Unstable measured values of voltage, current, and power.

The theoretical (calculated) power value does not match the measured value.

A. The causes arising from the power meter may be covered under Q3. The values of power meter A and power meter B do not match. Please refer that question and answer.

Applicable Models:

WT110 WT200 WT210	WT130 WT230	WT1010 WT1030 WT1030M	WT1600	WT2010 WT2030	PZ4000	WT3000

The power, power factor, and phase angle of each input element do not match when measuring the balanced three-phase load

A. In the case of three-phase three-wire, or 3V3A wiring, the power, power factor, and phase angle of each input element do not match because it is the line to line voltage that is measured.

Applicable Models:

WT110 WT200 WT210	WT130 WT230	WT1010 WT1030 WT1030M	WT1600	WT2010 WT2030	PZ4000	WT3000

Explanation:

Terminology
Tm Faq 01

Ex.: When wiring the WT1600 for 3V3A, wire U1 and U2 using phase T as a reference.
Tm Faq 02

The relationship between the phase voltage and
the line to line voltage is shown in the figure.

If the phase angle of the phase voltage and phase current is 0 degrees, the relationship between the line to line voltage and phase current becomes that in the figure below.
Phase current is input for the power meter's current input, so IR=I1, IS=I2, IT=I3.
Tm Faq 03

In three-phase signals where the phase angle of voltage and current is 0 degrees, if you wire the WT1600 for 3V3A, the phase difference of voltage and current on input element 1, as shown in the figure on the right, is +30 degrees. For input element 2, the phase difference of voltage and current is -30 degrees. For input element 3, the phase difference of voltage and current is +90 degrees. (Notated with a + if the current lags the voltage, and a - if the current leads). As a result, the phase difference of voltage and current is different for each input element.

Therefore, the active power values P1, P2, and P3 of each input element are different as displayed. When measuring power with 3V3A or three-phase three-wire systems, the values of P1, P2, and P3 have a particular meaning that does not directly indicate some physical quantity. Rather, they indicate a power in which the phase is apparently off by 30 or 90 degrees, and the total three-phase power is only indicated by the value (P1+P2).
Tm Faq 04

Vector diagram of the between wire voltage and phase current
(namely, vectors of the voltage and current input to the power meter)

When measuring the balanced three-phase load and displaying the waveform on the power meter, the phase angle of the voltage across each input element is not 120 degrees.

A. In the case of three-phase three-wire, or 3V3A wiring scheme, the phase angle of voltage between each input element is 60 degrees because it is the line to line voltage that is measured.

Applicable Models:

WT110 WT200 WT210	WT130 WT230	WT1010 WT1030 WT1030M	WT1600	WT2010 WT2030	PZ4000	WT3000

Explanation:
In the case of a three-phase three-wire, or 3V3A wiring scheme, since the voltage that is measured is the line to line voltage, the phase angle of voltage between each input element is 60 degrees. The power meter displays this line to line voltage for you to observe.
Tm Faq 05

For details, see Q5. The power, power factor, and phase angle of each input element do not match when measuring the balanced three-phase load

Tm Faq 06

When measuring the balanced three-phase load, sometimes the result is a negative value

A. In the case of a three-phase three-wire, or 3V3A wiring scheme, the phase angle of voltage and current input to each input differs from that of the actual load because it is the line to line voltage that is measured.

Applicable Models:

WT110 WT200 WT210	WT130 WT230	WT1010 WT1030 WT1030M	WT1600	WT2010 WT2030	PZ4000	WT3000

Explanation:

For details, see The power, power factor, and phase angle of each input element do not match when measuring the balanced three-phase load.

In three-phase signals where the phase angle of voltage and current is 0°, if you wire the WT1600 for 3V3A:
For input element 1, the phase difference of voltage and current is +30°
For input element 2, the phase difference of voltage and current is -30°
For input element 3, the phase difference of voltage and current is +90°
(Notated with a + if the current lags the voltage, and a - if the current leads)

In an actual three-phase load, if the phase difference of phase voltage and phase current is α°, the phase difference of each input element of the power meter is:
For input element 1, the phase difference of voltage and current is α° +30°
For input element 2, the phase difference of voltage and current is α° -30°
For input element 3, the phase difference of voltage and current is α° +90°
...and the phase difference changes.

As for the total value of α (the phase difference of phase voltage and phase current in the acutal load) on a given element, the value α° +30°, or α° -30°, or α° +90° can be larger than 90°

In that case, the measured power value for that input element may be - (negative).

However, this is due to the fact that the measureing method is "apparent" or "for purposes of line to line voltage measurement," and does not reflect the true value of the load, which can never by negative.

The theoretical (calculated) three-phase apparent power values (ΣVA and ΣS) do not match the measured values. Also, the measured values from power meter A and power meter B do not match.

This is due to measurement and calculation error, or differences in calculation methods.

Applicable Models:

WT110 WT200 WT210	WT130 WT230	WT1010 WT1030 WT1030M	WT1600	WT2010 WT2030	PZ4000	WT3000

Explanation:

On the WT, the three-phase apparent power (ΣS) equation is calculated under the assumption of a balanced condition (the absolute value of each phase is the same, and the phase angle is 120°). When balanced, the line to line voltages U1, U2, and U3 in three-phase three-wire or 3V3A configuration result in phase voltages of √3 times UR, US, and UT.
Considering the three-phase apparent power, three-phase four wire is simply the sum of each phase:
    Three-phase four-wire ΣS = S1+S2+S3

For three-phase three-wire and three-phase three-wire (3V3A), the apparent power is, in princicple, not measured. Therefore when balanced, a coefficient is used such that the same value as three-phase four-wire ΣS, and the following equations are used:
    Three-phase three-wire ΣS = √3/2(S1+S3)
    3V3AΣS = √3/3(S1+S2+S3).
Tm Faq 07

Consequently, when unbalanced, since the phase-to-phase phase angle is not 120°, and the votlage value of each phase is of a different size, the line to line voltages U1, U2, and U3 above do not result in phase voltages of √3 times UR, US, and UT. Therefore, ΣS calculated for three-phase three-wire or 3V3A can differ from the value of ΣS determined in a three-phase four-wire configuration.

The theoretical (calculated) power factor and phase angle do not match the measured values. Also, the measured values from power meter A and power meter B do not match.

A. When measuring input signals of distorted waves, signals that are DC-offset, or signals that include superimposed harmonic components, different values for power factor and phase angle will be obtained than those expected with sine waves.

Applicable Models:

WT110 WT200 WT210	WT130 WT230	WT1010 WT1030 WT1030M	WT1600	WT2010 WT2030	PZ4000	WT3000

Explanation:

When a single phase is being measured, the WT performs calculations as follows:
Power factor = active power/apparent power (apparent power = voltage x current)
Phase angle = cos-1 (active power/apparent power)

Therefore, the power factor and phase angle of input signals of distorted, DC-offset, or superimposed harmonic component inclusive waves will differ from the power factor and phase angle of the fundamental wave. Also, on other measuring instruments, the measuring or calculation method may differ from that of the WT, so the power factor and phase angle values may also differ.
Additionally, for a power factor close to 0 (phase angle of voltage and current is close to 90°), slight measurement error in the measured values of voltage, current, and power will affect the power factor and phase angle values.
Check that the measuring range is set appropriately, and check that the calculation error attributable to the error in voltage, current, and power is within that range.
On the WT, the following calculations are used for three-phase three-wire or 3V3A configurations:
Σpower factor = Σactive power/Σapparent power
Σphase angle = cos-1 (Σactive power/Σapparent power)

Therefore, the source of error in the Σapparent power value is the source of error in the value of Σpower factor or Σphase angle. For details, see Q8. The theoretical (calculated) three-phase apparent power values (ΣVA and ΣS) do not match the measured values. Also, the measured values from power meter A and power meter B do not match. or, Q3. Voltage, current, and power values measured on power meter A do not match those from power meter B.

The power factor (value calculated as active power/apparent power) in the case of a distorted waveform is called the total power factor.
The apparent power increases with distortion of the waveform, and the power factor (calculated value) becomes less accurate.
"Phase compensation" (or "power-factor improvement") can be thought to mean, in addition to resolving phase differences in the voltage and current, improving the waveform distortion.

The peak value and crest factor do not match, and are not stable

The peak value may not have been captured accurately due to the reasons below.

Applicable Models:

WT110 WT200 WT210	WT130 WT230	WT1010 WT1030 WT1030M	WT1600	WT2010 WT2030	PZ4000	WT3000

Explanation:

The cause is the difficulty in capturing the narrow spiked peaks of single-shot phenomena with high accuracy.

The WT's sampling speed is from a few dozen kHz to several hundred kHz.
The peak values of signals whose peaks are more narrow than this may not be captured by the WT. On the other hand, if it is a repeating, stable peak signal, the WT has a good chance of capturing it.
For rising peak signals having components that are higher than the WT's bandwidth, the peak is attenuated by analog bandwidth restriction. Therefore the peak value may not be captured by the WT.

The crest factor is calculated as

Therefore, if the peak value is not stable, neither will the crest factor be stable.
Tm Faq 09

Measurements of voltage, current, and power in normal mode and harmonic mode do not match

A. This is due to differences in calculation methods for normal mode and harmonic mode.

Applicable Models:

WT110 WT200 WT210	WT130 WT230	WT1010 WT1030 WT1030M	WT1600	WT2010 WT2030	PZ4000	WT3000

Explanation:

The voltage, current, and power in normal mode are displayed as the total of the measured values from all components (starting with the DC current component) in the bandwidth range. Therefore, even if there are signal components between the fundamental wave and the second order harmonic (interharmonic components exist), they are included in the total value that is displayed.

Tm Faq 10

On the other hand, when measuring in harmonic mode, signal components between the fundamental wave component and 2nd order harmonic component are not included in the total values for voltage, current, and power. In other words, since the interharmonics are not included in the total value (fundamental wave + 2nd order + 3rd order...), basically the total value in harmonic mode is slightly smaller than that of normal mode.

Tm Faq 11

Measurments of inverter efficiency exceed 100%

The cause could be any of the following.

Applicable Models:

WT110 WT200 WT210	WT130 WT230	WT1010 WT1030 WT1030M	WT1600	WT2010 WT2030	PZ4000	WT3000

Explanation:

Tm Faq 12

Is there any crosstalk (especially around the 2nd order)?
Are there any effects of CMRR (especially around the 2nd order)?
Is the location of measurement immediately next to the inverter I/O?
Is the measuring lead too long?
There are cases where switching the measuring lead from shielded cable to twisted pair can reduce the influence of noise.
It is best to keep the measuring leads away from the ground or reference potential (to prevent capacitive coupling with the GND).
If using a CT, there are cases when you should disconnect from ground.
Is the input too small relative to the rating of the PT or CT current sensor?
Is the combination of PT, CT, or current sensor and power meter range appropriate?
Is the sync source setting the same for all inputs (the setting can be unified on the WT1600 and PZ4000)

See "Capturing Explanation WT1600 and PZ4000 Calculation Interval

The measured/displayed value on the main unit does not match the DA output displayed value

A. The following may be causing the problem.

5V may have occurred during rating. Check the range setting again.
DA output error can affect the values when the input is smaller than the rating.
Have you checked the error of the measuring instrument measuring the DA output?
Noise may be occuring in the cable.
Is the bandwidth and averaging process of the measuring instrument measuring the DA output appropriate?

Applicable Models:

WT110 WT200 WT210	WT130 WT230	WT1010 WT1030 WT1030M	WT1600	WT2010 WT2030	PZ4000	WT3000

Unstable measured values of Var and ΣVar

Check the "Synch Source" and frequency filter settings.

Applicable Models:

WT110 WT200 WT210	WT130 WT230	WT1010 WT1030 WT1030M	WT1600	WT2010 WT2030	PZ4000	WT3000

Explanation:

When a single-phase signal being measured fluctuates around power factor of 1.

Slight fluctuations in the measured values of voltage, current, and power can cause a large instabilities in the calculation of Var (around power factor 1) and ΣVar. In this case, to stabilize the measured values of voltage, current, and power, check the sync source setting and zero cross filter setting.

For more information, see Q1. Unstable measured values of voltage, current, and power.
When a three-phase signal being measured fluctuates around a phase angle of 30 degrees.

In the case of zero cross filter (frequency filter), three-phase three-wire, or 3V3A wiring, in the vicinity of phase angle 30°, input to the power meter is the same condition as the above single-phase measurement. For details, see The power, power factor, and phase angle of each input element do not match when measuring the balanced three-phase load. Therefore, slight fluctuations in the measured values of voltage, current, and power or instable leading/lagging detection can cause large instabilities in the calculation of Var and ΣVar. Check the Synch source and zero cross filter settings.

Why are the input terminals on the rear panel of the power meter?

A. This takes into account safety when handling the measuring instrument.

Applicable Models:

WT110 WT200 WT210	WT130 WT230	WT1010 WT1030 WT1030M	WT1600	WT2010 WT2030	PZ4000	WT3000

Explanation:

All our company’s power meter input terminals are on the rear panels. The major reasons for this involve safety when handling the measuring instrument. The signal input to the power meter normally carries high voltage and large current, so we place the terminals in the back so that the user will not accidentally touch an electrical component when operating the front panel keys. Recently, we are designing safety into our products through the use of safety terminals for voltage terminals, binding posts for current terminals, and protective covers that make it difficult to touch the terminals. However, sometimes you can forget the protective cover, or a disconnection happens unexpectedly, so to ensure safety we feel it is desirable to locate the input terminals on the rear panel.

Supplement: See Q17, “Why do you use a binding post for the current terminals?

Why do you use a binding post for the current terminals?

A. This is to prevent an open current circuit.

Applicable Models:

WT110 WT200 WT210	WT130 WT230	WT1010 WT1030 WT1030M	WT1600	WT2010 WT2030	PZ4000	WT3000

Explanation:

Our company’s power meters use binding posts for their current terminals. Among non-Japanese powermeters, there are products that also use safety terminals for current terminals. Safety terminals can be said to be safe because the terminal is not exposed in the event that wiring becomes disconnected, but the wiring itself is easily disconnected. If the current circuit can easily become an open circuit, this represents a safety hazard. Therefore, with our powermeters, wiring is fastened with binding posts terminals ensuring that they cannot be easily pulled out, and by covering the terminals with a protective cover, they cannot be directly touched. Also, when you consider measurements of large currents with a powermeter, a common safety terminal can handle currents of about 20 A, which makes them inappropriate for large current measurement. Note that the types of input terminal used may change depending on current customer demand and technical trends.

Trouble Shooting - WE7000

For which instruments has a test certificate been issued?: The following instruments have a test certificate: WE7000, communication module / card, measurement / interface module, pattern I/O probe, and the input/output terminal box. (Models: 707001, 707002, 707021, 707031, 707032, 707033, 707034, 707035, 707036, 707037, 707038, 707051, 707111, 707121, 707141, 707241, 707245, 707251, 707261, 707262, 707271, 707272, 707275, 707281, 707282, 707811, 707823, 707824)
For which instruments has a certificate of calibration been issued?: The following measurement modules have calibration certificates: (Models: 707111, 707121, 707141, 707241, 707245, 707251, 707262, 707271, 707272, 707275, 707281, 707282, 707311)
What's the recommended calibration period?: To maintain measurement precision, we recommend that calibration be performed once a year.
What is the warranty period for the WE7000?: The warranty period is 1 year for the main instrument, modules, and cards (accessories are not covered by warranty). In the unlikely event that a device should fail during the warranty period, repair will be provided free of charge per the terms of the warranty.
For the main unit: Can the device be operated on DC power?: At present, a separate DC/AC inverter is required. In case of the WE800 measurement station (eight slots), it has a maximum power consumption of 550VA.
For the main unit: How much lag time is there when inputting or outputting a signal from the external terminal of the measurement station?: The lag time from the external terminal to the bus trigger / time base is as follows:

When inputting from TRIG IN:
TRIG IN -> bus trigger signal : 40 ns (typical value)
TRIG IN -> time base signal : 25 ns (typical value)

When inputting from EXT. I/O:
EXT. I/O -> bus trigger signal : 25 ns (typical value)
EXT. I/O ->time base signal : 10ns (typical value)

When outputting to EXT. I/O:
EXT. I/O <- bus trigger signal : 25ns (typical value)
EXT. I/O <- time base signal : 25ns (typical value)

The lag time between the bus trigger / time base and each measurement module differs depending on the module. See the following example:

Bus trigger signal -> WE7111 Digital oscilloscope module : 30 ns
+ sampling interval (typical value*)
* Typical value represents a typical or average value. It is not strictly guaranteed.
For the main unit: Can you perform simultaneous measurements with several different kinds of measurement modules? Also, what would be the time lag in the start timing?: Simultaneous measurement is possible by making use of the station's internal arming signal. The lag in start timing between each module would be 10 ms or less. (Some modules do not allow connection to the arming signal.)
Can you input tens to hundreds of volts to the A/D modules such as digitizers?: The WE7241 digital temperature measurement module can measure up to ±50V, the WE7271/WE7272 4-CH, 100 kS/s Isolation digitizer module up to ±35V, and the WE7275 2-CH, 1 MS/s Digitizer module accepts up to ±350V.
Can you set the input range for each channel on the A/D modules such as digitizers?: Yes, you can set the range for each channel.
Is it possible to perform continuous measurement with no dead time and send the data to a PC using the A/D modules such as digitizers?: You can perform continuous measurement using the digitizer module's Free Run mode. However, data transmission speeds are limited. Please consult your sales representative for details. They can tell you whether data transmission would be practical in your particular operating environment.
When operating measurement modules such as the A/D module in trigger mode, can you set trigger activation using OR and AND on the trigger conditions of the input signal and the signal from the external input terminals [TRIGIN] and [EXT. I/O] of the the measuring station?: Yes it's possible. We've made it so that you can detect the trigger conditions of the input signal with the module, output the result once to the trigger bus of the measuring station, then send back the result from the OR and AND operation once more to the module from the trigger bus. OR and AND are determined using the external signal condition coming from the external input terminals [TRIG IN] and [EXT. I/O], and the module's trigger condition. The settings are as follows: Set the input conditions for the input channel on the module side, and set the trigger source to bus trigger. In the measuring station's Trigger Source/Timebase Source/Arming Settings dialog box, set it so the signal from the external input terminals [TRIGIN] and [EXT. I/O] input to trigger bus [BUSTRIG1] and [BUSTRIG2]. Also, set it so signals are transmitted from the module to trigger bus [BUSTRIG1], and from trigger bus [BUSTRIG1] and [BUSTRIG2] to the module.
What's the sampling interval of the WE7241 10-CH, digital thermometer module?: The period changes with the type of time base and the number of measurement channels per module. (1) Time base = internal. Number of channels : 1-2 = 0.2 s, 3-5 = 0.3 s, 6-7 = 0.4 s, 8-10 = 0.5 s. (When modules are connected in a series, the sampling interval is that of the slowest module in the series.) (2) Time base = external. 2 s or more (regardless of the number of channels).
Is there an input filter on the digitizer module?: The WE7275 2-CH, 1 MS/s isolated digitizer module comes with an up-to-40 kHz anti-aliasing filter. Also, each digitizer module (WE7275/WE7271/WE7272/WE7251/WE7245) includes a low-pass filter. The cut-off frequency varies depending on the module.
Is it possible to AC-couple the input with the digitizer module?: AC coupling is supported by the WE7275 2-CH, 1 MS/s Isolated digitizer module.
How big is the WE7251/WE7271/WE7272/WE7275 digitizer module's record length (memory length)?: For high-speed data recording in trigger mode/gate mode, the Digitizer module is equipped with internal memory to store measurement data in order to record reliable data without receiving any effects of the load condition on the PC side. The record length for the WE7251 is 1 M word, or 4 M word for the WE7271/WE7272/WE7275. The record length per channel is this number divided by the number of measurement channels per module (in the case of the WE7271/WE7272, when you select 3 channels, it is considered to be four). (However, when connecting multiple WE7251s together, the memory is 100K word per channel regardless of the actual number of measurement channels.) Example : When using four channels with the WE7271/WE7272, you can use 1 M (=4 M/4) word per channel. Note: the maximum record length (memory length) is one-half of the above mentioned values when using the [Repeat] function which takes measurement data repeatedly in trigger mode. Example: when using four channels on the WE7271/WE7272 in trigger mode with the repeat function, the memory per channel is 4M/4/2=500k word.
What is the update cycle for the D/A output of the WE7141 100 MHz Universal counter module?: The update cycle changes depending on the acquisition mode and the gate time during frequency measurement. When the acquisition mode is [One Shot], the update cycle is approximately 0.5-1 seconds. However for frequency measurement, it's about 10 seconds when the gate time is 10 seconds. When the method is [Free Run], the update cycle occurs at each sampling interval. However for frequency measurement, it occurs approximately at each (gate time + sampling interval).
Is contact input/output possible with the WE7262 32-bit Digital I/O module?: Contact input/output is possible using the WE7262 32-bit Digital input/output module's 707823/707824 16-bit Digital input/output terminal box.
What's the difference between the WE7271 and the WE7272 digitizer modules?: The input connectors are different (the WE7271 has a clamp type terminal, and the WE7272 has a BNC terminal). Also, the maximum common mode voltage, and maximum voltage between channels vary in their specifications between the two instruments (the WE7272 is lower). Please see the specification sheet for details.
What's the difference between the WE7281 and the WE7282 4-CH, 100 kS/s D/A modules?: The output connectors are different. The WE7281 has a clamp type terminal, and the WE7282 has a BNC terminal. Also, the maximum common mode voltage, and maximum voltage between channels etc. vary in their specifications between the two instruments (the WE7282 is lower).
Is it possible to connect to the Ethernet with 100Base-TX?: It's possible to connect using 100Base-TX/10Base-T with the WE7052 Fast Ethernet module.
Is it possible to automatically select the communication speed (100Base-TX/10Base-T) and connection method (FULL DUPLEX/HALF DUPLEX) when connected to the Ethernet?: The WE7052 Fast Ethernet module supports automatic selection (AUTO NEGOTIATION) of communication speed and communication method. Manual setting is possible for connecting with an instrument that doesn't have the AUTO NEGOTIATION function.
I want to connect to my facility's LAN with the Ethernet module, but does it support DHCP?: The WE7052 Fast Ethernet module supports DHCP. However, you must have the WE7000 control software ver. 4 or later.
I'm using the WE7051 Ethernet module (10Base-T) and I want to purchase the new WE7052 Fast Ethernet module (100Base-TX/10Base-T), but can they be used together?: Yes, you can use the WE7051 Ethernet module (10Base-T) and the WE7052 Fast Ethernet module (100Base-TX/10Base-T) together.
Is it possible to bypass the router (subnet) and connect with the Ethernet module?: You can bypass the router (subnet) and connect using the WE7000 control software ver. 4 and later. (However, this is limited to the WE7052 Fast Ethernet module.)
Can I make a direct one-to-one connection from my PC to a measuring station using a cross cable?: Connection by cross cable does not comply with Ethernet standards. For reliable data communications, use a hub when you want to make a direct connection to a PC.
What variations of optical interface cards are there?: We have PCI and ISA bus cards, and within each of those there are 1-port and 2-port types.
Are the optical interface cards, modules, and cables all compatible with each other?: The optical interface cards and modules (the WE7031/WE7032/WE7033/WE7034) we've been selling up to now and the new modules (the WE7035/WE7036/WE7037/WE7038), including cables, are cross compatible.
What exactly is the UDP/IP which is employed by the WE7000 Ethernet module? Aside from the TCP/IP environment, do I need any special software or something to run it?: Within the protocol system, TCP and UDP (short for "User Datagram Protocol" which puts a priority on high-speed) both occupy the high rank of IP, but differ in use and function. Generally speaking, however, when we use the network environment term TCP/IP we are referring to a protocol group which includes UDP. Thus, the WE7000 Ethernet module will not have a problem operating in any network environment that runs TCP/IP.
Which version of Excel can be used with the WE7000 Control Software?: Microsoft(R) Excel 97 and 2000 only.
Can I perform waveform calculations in real time?: This can be done with the 707702 Computation Function Setup Software (sold separately). By creating arithmetic expressions, you can perform calculations with the 4 basic arithmetic operators, absolute value, pulse width, filtering, calculus, and FFT. Also averaging and waveform parameter measurement is possible.
Is there an arbitrary waveform data creation tool for output on the WE7281 4-ch, 100 KS/sD/A module and the WE7121 10 MHz function generator module?: We now offer software called the 707751 Arbitrary Waveform Editor (sold separately). You can create waveforms using the editor's standard functions or with the mouse. You can read in files created in CSV, or in Yokogawa's proprietary wvf file format for WE7000 measurement data. Also, the WE7000 Control Software comes standard with a function that converts CSV files to arbitrary waveform data readable by the WE7121. Thus, you don't need any separately sold software.
What's the measurement data format?: You can select whether to save files in binary (WVF format) or ASCII (CSV format). WVF is Yokogawa's proprietary format. CSV format can be read by popular spreadsheet programs.
What are the system requirements for a PC to be connected to the WE7000?: Please follow this link: System Requirements
When I click the window in the Waveform Monitor (or "Waveform Viewer" with the WE7000 control software ver. 3) the display update stops.: If Internet Explorer 4.0 or the Plus! pack is installed on your system, you'll need to make changes to the settings as shown below (these instructions are also printed in section 5.1, "Troubleshooting" in the "WE7000 User's Manual (IM707001-01E)"). Internet Explorer 4.0 Go to the [Start Menu] - [Settings] - [Folder and Icon] display tab, then unmark the "Show Window Contents While Dragging" checkbox item under the graphics settings. Plus! Go to [My Computer] - [Control Panel] - [Screen], then unmark the "Show Window Contents While Dragging" checkbox on on the Plus! tab.
I can't use the waveform parameter automatic measurement function (Measure) or the computation function (Math Setting).: To use the waveform parameter automatic measurment function or the computation function, you need the "707702 Computation Function Set-up Software" (sold separately. In the case of the WE7111, you can perform waveform parameter automatic measurement without this software). When you install the software, the waveform parameter automatic measurement function (Measure) as well as the computation function (Math Setting) become active on the waveform monitor.
After installing the WE7000 control software I connect the PC to a measuring station via serial communications or Ethernet, then try to run the WE7000 control software but it won't run.: When you wish to connect by serial communications or Ethernet, it's necessary to create a shortcut with a start option added to the end of the shortcut target. For WE control software V3.1.2 and later, a shortcut is created automatically after installation. For instructions on setting the start option, see section 3.2 "Installing the WE7000 Control Software" in the WE7000 User's Manual (IM707001-01E, 5th Edition and later).
I used serial communication to enter communications settings in order to connect to the Ethernet, but I can't establish communications with the measuring station.: After entering communications settings with serial communications, use the main power switch on the back of the measuring instrument to perform a power cycle. Also, in the MS DOS prompt window, try executing the command "ping XXX.XXX.XXX.XXX" (where XXX.XXX.XXX.XXX is the IP address for the WE7000). If the message, "Reply from..." is displayed that means the communications settings were successfully entered, but if the "Time out..." message is displayed please check the TCP/IP settings on the PC and the cable connections.
When using the WE7051 Ethernet module, if I turn the main power switch on the back of the measuring station OFF then immediately ON again, the standby power on the measuring station turns ON.: You must wait at least five seconds after turning the main power switch OFF before turning it back ON again. Please do not switch the power OFF and ON in less than 5 seconds.
How can I use an ISA fiber optic interface card if there aren't any more available IRQs left in the PC?: If you wish to install a fiber optic card in a PC with a lack of available IRQs, you can reserve a PCI slot in the PC BIOS which frees up an IRQ and allows you to use the card. However, this method may not work on all kinds of PCs.
I was using the WE7033/WE7034 optical interface card (for ISA bus), but can I switch to the WE7035/WE7036 PCI optical interface card for PCI bus?: The communication drivers are different so you'll need a new driver for the WE7035/WE7036. The driver is located on the WE7000 Control Software CD ROM Ver. 3.1.2 and later.
If I turn the main power switch on the back of the measuring station OFF then immediately ON again, there are times when I can't operate the modules such as the WE7281/WE7282 4-CH, 100 kS/s D/A module.: You must wait at least five seconds after turning the power switch to the measuring instrument OFF before turning it back ON again. If you wait less than five seconds, there is a possibility for a malfunction to occur in the measuring instrument.
When I enter a numerical value for the record length setting into the WE7275/WE7271/WE7272 digitizer module in trigger mode, there are times when it changes to 0 or some other value.: The minimum record length which can be input is limited such that "record length x sampling interval" must be 5 milliseconds or more. When you set the record length to a value smaller than this it automatically changes to a 0 or an otherwise allowable minimum record length value. (Setting the value to 0 indicates "Maximum Record Length/Number of Memory Partitions".) See the online help for details.
I input a trigger signal into the external trigger input (TRIG IN) of the measuring station and measurement is started on the WE7251/WE7271 digitizer module. If the set detection level is set to "H Active" and I keep the trigger signal at the "H" level, the trigger activates repeatedly.: The external trigger input (TRIG IN) as well as external input/output (EXT. I/O) trigger signal becomes the level signal. Then the WE7251/WE7271 digitizer module detects the bus trigger by that level. Because of that, as long as external signals remain "true", triggers are activated repeatedly.
I can't carry out the self test correctly on the WE7111 digital oscilloscope module.: You must use a probe with a attenuator of "10:1", otherwise the self test will not run correctly. Also, before executing the self-test, please allow for a 30 minutes warm-up time. If the instrument does not warm up, the self test may not be accurate.
I can't take measurements using the WE7261/WE7262 32bit digital I/O module.: With either the WE7141 100 MHz universal counter module or the WE7261/WE7262 32 bit digital I/O module, if you are performing continuous measurements with more than three of the same modules you must set the sampling interval of each of those modules to "20 ms" or higher.
The math waveform won't realtime-display in free run mode.: In free run mode, the execution timing is different depending on the type of computation. In the case of computations such as FFT, filter, and pulse width etc. in which various data are arranged in a chronological direction, calculation cannot be carried out during measurement. Once the measurement has been completed, the computation is performed and the results are displayed on the waveform monitor. For computations using the four mathematical operations, exponents, logarithms, and trigonometry etc., you can perform them anytime during measurement (even if there were only one data available for calculation) and display the results on the waveform monitor. Please see the waveform monitor help documentation for details.
When I try to load a CSV file with the arbitrary waveform editor (model: 707751), I get an error.: There are limitations to the CSV format which can be read by the arbitrary waveform editor. It can only read CSV format if the values are arranged in a single column. In the case of CSV files converted from wvf format in the WE7000 control software, there are several channels of data which also include the time axis and header information so they can't be directly read by the editor. (See the Arbitrary Waveform Editor User's Manual for details.) It's necessary to cut and paste one channel's data and recreate the CSV file.

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Yokogawa : Test & Measurement : Quality – Innovation – Foresight

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DL1500 Series Portable Digital Oscilloscopes

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Trouble Shooting - WE7000

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Yokogawa : Test & Measurement : Quality – Innovation – Foresight

FAQ

Select a Category to view FAQ's

General questions

DL7100 SignalExplorer

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DL1500 Series Portable Digital Oscilloscopes

DL2700 Digital Oscilloscopes

WT3000 Precision Power Analyzer

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PZ4000 Power Anlyzer

Communications for WT Series and PZ4000

Power Measurement Instruments, General

Trouble Shooting - WE7000

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