Agilent 4156C Sampling Issue

[tomahawk]

Hi, all.

I am trying to build a simple VI that can do sampling measurement with Agilent 4156C Semiconductor Analyzer.

What I want to do is very simple: While supplying a constant voltage to one of SMUs, I want to sample the voltage values at both of two VMUs for a certain period, for example, 10 seconds.

The problem I have to implement this measurement is that a proper VI to set up DC voltage values to SMUs is missing. I can do exactly what I want to do with the panel, but when I try to acheive the function with LabView, I cannot find suitable VI in the VI library I downloaded from here.

I may have to build a VI from a scratch, but I just want to ask you guys first.

Does anybody have solution for this issue?

[ManLongAtNI]

Hello tomahawk,

If that function has not been written in the following link, you will likely have to reference the user manual for that device and develop the appropriate VISA Write and Read to make your desired commands.

Regards,

Glenn 

[tomahawk]

Thank you for your comment, and actually I figured it out.

The another issue I have now is to keep the SMU voltage constant while sampling at a voltage and moving to another voltage value. For example, after I give -10V to SMU1 and sample VMU1 and VMU2,  I would like to move on to -9V at SMU1 and do the same sampling at VMU1 and VMU2. However, how the voltage at SMU1 changes is like this; -10V while sampling -> 0V while changing SMU1 voltage -> -9V while another sampling -> 0V while changing voltage setting again. So it continuously goes back and forth to 0V, and I don't want this.

Is there any way I can keep the output voltage at SMU1 after a measurement?

Also, how can I change the resolution of SMU to get maximum voltage output (+-100V) to SMUs? I can get +-40V now, but not more than that.

Thank you for your help.

[ManLongAtNI]

Hi tomahawk,

That appears to be a configuration setting to your device, I would contact Agilent for appropriate VISA Write & Read commands.

Regards,

Glenn