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Source Delay Accuracy

Models 2400, 2401, 2410, 2420, 2425, 2430, 2440, 6430
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Joined: August 16th, 2021, 12:03 pm
Country: United States

Source Delay Accuracy

Post by wynfri » August 16th, 2021, 1:00 pm


I have a 2401 Keithley SourceMeter and I am attempting to output a sweep that will go 0,2,0 (volts) where it is outputting 2 volts for exactly 45ms. It only needs to preform the sweep once. I feel I am very close but the only issue I am having is I am using Source Delay in order to control the pulse width and it is not very accurate. For example I have to delay .0165 in order to get a 45.244 ms pulse. But if I delay .1 the pulse width is 112.52ms. There doesn't seem to be any logic or reason as to what to make the delay.

I am basically asking how could I find the correct delay time without trial and error like I had to do to find this .0165 number.

I would really appreciate any advice or help! Thank you!

My C# Code:
SendOnly(":SOUR:FUNC VOLT"); //Volts source function.
SendOnly(":SENS:CURR:PROT 1");

SendOnly(":SOUR:LIST:VOLT 0,2,0");


SendOnly(":SOUR:DEL 0.0");
SendOnly(":TRIG:COUN 3");

SendOnly(":SOUR:DEL " +delayTime);

SendOnly(":OUTP ON");

//get read info at 18-49
Console.WriteLine(SendAndReceive(":READ?"));//Trigger sweep, request data.

SendOnly(":OUTP OFF");

Andrea C
Keithley Applications
Keithley Applications
Posts: 1613
Joined: October 15th, 2010, 10:35 am
Country: United States

Re: Source Delay Accuracy

Post by Andrea C » August 18th, 2021, 5:00 am

With the older models like 2401 or 2400, you might need to do some tuning of delay parameters to get the desired pulse time.
Here is a technical document that describes the process:
https://download.tek.com/document/Gener ... pdf#page47

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