The measurement procedures and settings for harmonic/flicker standards testing have been precisely defined. Engineers must also stay current with the specialized knowledge and up-to-date information required to periodically review the contents of the standards and perform the standards conformance tests. The model 761922 Harmonic/Flicker Measurement Software enables engineers without specialized knowledge to perform a range of operations using the WT3000/WT3000E Precision Power Analyzer including judging standards compliance and outputting test reports.
|Harmonic Current Measurement Value List |
Displays harmonic measurement data as a single list.
|Viewing Trends |
You can capture various types of data measured into your PC at 200ms fixed intervals. Thus, you can view trends graphically. This feature lets you monitor power supply voltage fluctuations, changes in current consumption and other time-based variations.
|Harmonic Current Bar Graph |
Evaluates whether harmonic data is within the standard limit value, and displays the result as a bar graph. The display of evaluation results is color-coded, in colors such as red and blue.2
|Measurement Value Judgement Graph |
Measures the harmonic current over the set observation time, and evaluates it in conformance with the standard. Evaluation results are displayed as PASS or FAIL.2
|Waveform Observation |
Lets you display voltage or current signal waveforms, and measure frequencies and peak values. Moving the cursor lets you display values for the displayed waveform.
|2:Evaluations conforming to the IEC61000-3-2 Ed. 4.0|
Automatic Report Generation
You can print harmonic measurement results as value lists and graphs, and save image data. Titles and comments can be entered in reports, letting you enter information such as measurement dates/times, device names or control numbers.
|You can enter settings on the WT3000/WT3000E from your PC. The wiring method, filters, and scaling settings can be modified.|
|Waveform data and harmonic current values can be saved on the PC. Measured data can be saved to .csv files for easy access by spreadsheet programs such as EXCEL.|
Voltage fluctuation and flicker measurement complying with IEC 61000-3-3 is executed. Calculates all the voltage fluctuation and flicker values of dc, dmax, d(t), Pst, and Plt, compares them to the preset limits, and indicates the total judgment.
Measured Value and Judgment for Each Observation Period
Normal Voltage Fluctuation and Flicker Measurement
|Displaying the Trend Graph |
You can show Trend Graph View. You can select from the following measurement functions.
|dc:||Relative steady-state voltage change|
|dmax:||Maximum relative voltage change|
|Tmax, d(t):||Period during which relative voltage change exceeds the threshold level|
|idc:||Instantaneous relative steady-state voltage change|
|idmax:||Instantaneous maximum relative voltage change|
|id(t):||Period during which instantaneous relative voltage change exceeds the threshold level|
|PF:||Instantaneous flicker sensation (IFS)|
|Displaying the CPF Graph |
You can select the element and color to be displayed on the CPF graph.
Up to four elements can be displayed simultaneously.
You can set a separate color for each element.
You can create reports using the data measured with the software.
Three Measurement Modes (during online operation)1. Harmonic Measurement Mode
NOTE: Saved measurement data can also be read and displayed during offline operation.2. Harmonics Observation Mode
Harmonic measurement system configuration*3: Many AC Power Sources are available to provide the low-distortion AC Voltage and frequency to power the device under test. In addition, for fullcompliance testing, the power source must be capable of supplying the full 16 A load current specified by the IEC standard. Contact your local Yokogawa representative for recommendations.*4: The model that full supports the standard is the WT3000/WT3000E.
|Item||IEC61000-4-7 Ed 2.0 Am1||Pricision Power Analyzer |
|Compliance with |
|Current measurement |
|5% of maximum |
allowance value or
0.15% of rated current,
whichever is larger.
|Accuracy for 40th-order |
frequency of 2.4 kHz
with 60 Hz fundamental
frequency (direct inpuit):
crest factor 3 (2.5% of reading+0.05% of range)
within 5% error (when
2% or larger of input />range)crest factor 6 (2.5% of reading+0.1% of range)
within 5% error (when 4% or larger of input
|Measuring instrument |
loss in current input circuit
|Voltage drop: 0.15V |
|Measuring instrument |
loss: 5.5Ω approx.
+ 0.03 µH approx.
|Complies through |
27 Arms approx.
|Crest factor in current |
|5Arms or less: 4 10Arms or less: 3.5 |
10Arms or over: 2.5
Overload display required
|3 or 6 |
Has overload display
| Range Composition of |
current input circuit;
|Direct input ranges: 0.1, |
0.2, 0.5, 1, 2, 5, 10, 20,
50, 100A are appropriate ranges.
| 0.5, 1, 2, 5, 10, 20, 30 |
A ranges (for crest factor 3)
0.25, 0.5, 1, 2, 5, 10, 15A
range (for crest factor 6)
|Complies within ranges on left. |
Precise measurements require attention to the range selection and the crest
|Range for external shunt: 0.1 to 1 V is appropriate.|| 0.5, 1, 2, 5, 10, 20, 30 |
A ranges (for crest factor
3) 0.25, 0.5, 1, 2, 5, 10,
15A range (for crest
|Maximum input is 1.2 times the range (cintinuous), or 10 times the range (1 second).|| Direct input: |
peak current of 90 A
or RMS of 33 A, whichever
is lower (continuous).
peak current of 150 A or
RMS of 50 A, whichever
is lower (1 second).
External sensor input:
Peak value not to
exceed 5 times the
Peak value not to
exceed 10 times the range (1 second)
|Anti-aliasing ||-50 dB min. ||-50 dB min. for fundamental frequency of 50 / 60 Hz up to 40th-order harmonic ||Yes|
|Window function shape ||Rectangular ||Rectangular ||Yes|
|Window function width ||10 cycle (50Hz)/12 cycle (60Hz) ||10 cycle (50Hz)/12 cycle (60Hz) ||Yes |
|Relative deviation of |
sampling frequency and
|Within ±0.03% ||Within ±0.03% ||Yes |
|Smoothing ||Time constant: 1.5 seconds ||Time constant: 1.5 seconds ||Yes |
|Filter time constant of Smoothing (Window width: 200ms )||Yes|
|General specifications ||Effects of temperature, |
humidity, power voltage,
common mode voltage,
static electricity, and
radiation field are
|See general |
|Complies for general specifications. |
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