Voltage Reading Sampling Rate

2000, 2001, 2002, 2010, 2100, 2110
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kelcmd
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Voltage Reading Sampling Rate

Post by kelcmd » July 16th, 2015, 12:29 pm

I need to program the Keithley 2000 to take data each cycle of an arbitrary wave for possibly days at a time. I need to the data to collect continuously with at least 3 digits, depending on the size of my signal. I need to to collect the data about every .1-1 ms. How do I find the sampling rate of the data? Also, is it possible to get the times of my data points?

To get it to collect data with the waveform, do I just use the external trigger option?

This is all being done on a computer (MATLAB)

Thank you

Dale C
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Re: Voltage Reading Sampling Rate

Post by Dale C » July 16th, 2015, 12:34 pm

The sampling rate of the Model 2000 is listed in the specs.
The maximum rate is 2000 readings per second.
To obtain that rate the following SCPI commands must be used.
And this is only into the internal buffer which is up to 1024 points.

*RST
:SYSTEM:AZERO:STATE OFF
:SENSE:VOLT:DC:NPLC 0.01
:SENSE:VOLT:DC:RANGE 10
:SENSE:VOLT:DC:AVERAGE:STATE OFF
:TRIGGER:COUNT 1
:SAMPLE:COUNT 1000
:TRIGGER:DELAY 0.0
:DISPLAY:ENABLE OFF
:READ?


Enter the data to the computer.

To check for maximum speed apply a 1V RMS at 2Hz to the input. Run the above command sequence. The 1000 readings should show one complete cycle or less. This shows the meter is taking data at least at a rate of 2000 readings per second.

kelcmd
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Joined: July 16th, 2015, 11:55 am
Country: United States

Re: Voltage Reading Sampling Rate

Post by kelcmd » July 16th, 2015, 12:42 pm

Is there a way to lower the sampling rate?

Also, is it possible to get it to trigger to a waveform generator with an arbitrary waveform?

Dale C
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Joined: June 10th, 2010, 6:22 am
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Re: Voltage Reading Sampling Rate

Post by Dale C » July 17th, 2015, 6:39 am

Modifying any of these commands affects the measurement rate.
The NPLC is the most important. But all affect speed.
Not sure what you mean by trigger a waveform generator with an arbitrary waveform.
The Model 2000 will output a trigger pulse at the end of each measurement.
This is on trigger link line 1 (pin1 on the trigger link connector).

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