Output Sweep

[Sorton]

Hello,

I have a small and simple problem. I want to sweep the signal using Keithley 2410 1100V SourceMeter (connected to LabView via GPIB). I setup everything properly. But then when I want to sweep the signal, the SourceMeter doesn't show anything until I press "sweep" button on the instrument. Can I make it trigger the sweep (and show it on the instrument and in Labview) when I start the process in LabView?

Thank you!

[Dennis_Knutson]

Are you using the driver from Keithley? If so, have you seen the example program and article here that does exactly what you are trying to do?

Message Edited by Dennis Knutson on 07-19-2007 09:30 AM

[Sorton]

Hello!

Oh I got it working. But now other obsticle came in the way. Is it possible to "time" the sweep? In other words is it possible to set the time period for sweeping (for each step)?

Thank you again

[Dennis_Knutson]

That, I don't remember. It's been a while since I've used this instrument and don't have a manual handy. I believe you had some control over the sweep time. Your manual should have this information.

[Albert.Geven]

Hi

You have a defined time and delay for each step. So timing with equal stepsize is easy.
for different steptiming within one sweep you could take more points with the same value but I don't see why you need such timing.

[Sorton]

Hello,

What Im actually trying to do is to slow down sweep where I would be able to record values.

Ex:   1V-(2sec.)-1.5V-(2sec.)-2V-(2sec.)-2.5V-(2sec.)-3V

Is that possible, and if it is, how?

Thank you!

[Dennis_Knutson]

I guess I'm confused now. The sweep example returns an array of results. Are you saying that this doesn't work or that you are not using the example?

[Sorton]

It doesnt work. Im using "Keithley 24XX Sweep and Acquire Measurements.vi" example. It doesnt work here becasue it is not ploting anything in the graph. Also what I want to do is to control the voltage step delay during the sweep (time between each sweep step_

Tahnk you.

[Dennis_Knutson]

I'm not sure why you wouldn't be seeing anything in the graph. Make sure that you are not getting an error from the instrument and that the graph is set to autoscale.

If you want to have more control over the step delay, just use a loop with a voltage set and a current measurement. You can use a for loop and wire in an array of voltage values or use a while loop with a start value, increment, and stop value. Inside the loop, put a Wait (ms) function or Delay function to control the rate.

[Albert.Geven]

Hi

As (almost) always Dennis hits the nail on the right spot.
You should find out why your sweep is not generating a graph.
And either take your sweep in chunks of 0.5 seconds and accept extra points when you only want slower.
Or use software timing (easily to do at these speeds.