How Can I Effectively Achieve a Sample Rate Less Than 5 Sa/sec on the Yokogawa DL850 ScopeCorder?

The lowest possible device setting for sample rate on the Yokogawa DL850 ScopeCorder is 5 Sa/sec. There are however, different methods that will allow you to achieve much lower sample rates which includes the use of an external clock, decimation by the instrument, or decimation by our Xviewer software.

For instructions on how to perform the EXT CLK and Decimation methods on the DL750, please refer to the attached PDF.

External Clock Method:

Under the initial settings, the DL850 samples the waveform data using a clock signal produced by its internal time-base circuit. You can use an external clock (EXT CLK) signal to control sampling by applying the external clock signal to the EXT CLK IN terminal on the left panel of the DL850. One data sample is stored to the acquisition memory at every pulse in the EXT CLK signal. The DL850 can accept a maximum 9.5 MHZ EXT CLK signal.

Keep in mind that the EXT CLK is limited by the module specification, providing a higher rate EXT CLK cannot force the module to sample at a higher rate than its maximum sample rate. For example, the 701251 module max sample rate is 1 MSa/sec; any inputted EXT CLK above 1 MHz will be ignored by the module. You can use two equations to help calculate the custom Time/Div and Sample Rates.

                        Time/Div = Record_Length

                        Sample Rate = EXT_CLK

DL850 EXT CLK Setup Procedure:

1.      Connect EXT CLK IN using a BNC Connector

2.      Input a Square wave at desired frequency, TTL level (0-5Vpeak), and a minimum pulse width of 50ns

3.      Press ACQUIRE to display the Acquire Menu

4.      Select Record Length soft button and set the desired record length

5.      Select Time Base EXT and make sure EXT is highlighted

Note: The DL850 does not display either the Sample Rate or Time/Div, but the record length will be displayed. When you control sampling using an external clock, you cannot change the time axis setting using the Time/Div knob. To change the time-axis display range, change the record length or zoom in on the time axis.

Decimation by Instrument Method:

Decimation is a technique used to reduce the number of samples. When saving data in ASCII format, data is decimated and converted to ASCII format before it is saved. In the DL850, decimation is called Data Removal Interval, and can be used to save a data point in specific intervals.

For example, a Data Removal Interval of “Per1000” means that for every 1000 points of data in your record length, 1 data point is converted to ASCII and saved.

DL850 Decimation (data removal interval) Setup Procedure:

1.      Press FILE » Waveform(Save) soft button

2.      Select Data Type » ASCII using the soft buttons

3.      Press Waveform Save Setup soft button to display the Setup Menu

4.      Navigate to the Interval category using the Jog Shuttle or Arrow Keys

5.      Press SET and choose the desired interval

6.      Confirm all Waveform Save Setup configurations

7.      Press ESC » Execute Save to save ASCII data file

Decimation by Xviewer:

Xviewer Decimation (data removal interval) Setup Procedure:

1.      Transfer or open the appropriate *.WVF, *.WDF, or *.CSV file in Xviewer

2.      Click on File » Save As » More Options located at the bottom right corner of the Save As menu

3.      Click on the Compression drop-down menu and select Decim

4.      Click on the Compression Rate drop-down menu and select the desired interval

5.      Confirm all save configuration and save destination

6.      Click on Save to save the file




Related Products & Solutions

DL7440/DL7480 Digital Oscilloscopes

8-channel 500 MHz oscilloscope with 16 logic inputs, for applications where four channels aren't enough.  Support for eight analog channels, 16 bits with 250MHz logic bandwidth, 16MP of recording memory, power analysis, serial bus analysis, and a broad selection of voltage and current probes.

DL9000 DSO Series

500MHz, 1.0GHz, and 1.5GHz DSOs for debug and high performance applications. 10th
generation oscilloscope from Yokogawa with industry leading 2.5 million wfms/sec and lowest dead time. Winner of Test & Measurement World's "Best in Test" award.

DLM2000 Mixed Signal Oscilloscopes

200, 350, and 500MHz mixed-signal oscilloscopes for every engineer. Best-in-class performance in usability, acquisition, analysis, and display—all at a price you can digest. Options include serial bus, vehicle bus, and power supply analysis functions.

DLM6000 MSO & DSO Series

500MHz, 1.0GHz, and 1.5GHz DSO and MSO models for debug, waveform characterization, bench top, or automated test applications. 4 channel models with 16 or 32 logic inputs. 12th generation oscilloscope with ergonomic physical and on-screen improvements.

Data Acquisition (DAQ)

Yokogawa data acquisition systems give you the most flexibility and power to measure, display, store, and even actuate any number of physical or electrical phenomena.

High Speed Data Acquisition

  • Yokogawa high-speed data acquisition systems
  • Industry-leading isolation, bit resolution, sampling rate, and memory depth
  • Independent channel hardware and easy to use software

Mixed Signal Oscilloscopes

  • Yokogawa mixed signal oscilloscopes
  • Simultaneous, time correlated observations
  • Analysis of analog with digital (logic) signals
  • Troubleshooting electrical anomalies, measuring parametric values, monitoring signals


  • Digital oscilloscopes
  • High-speed sampling
  • Range of bandwidths for electronic device design and development
  • Advantages of oscilloscope and multi-channel data recorder


  • Flexible, high-performance Yokogawa ScopeCorder
  • Modular platform combines mixed signal oscilloscope and portable data acquisition recorder 
  • Captures high-speed transients and low-speed trends