Swap DC and ground voltages of Keithley 2400 meter

[funnyfox]

Hi

I am using Keithley 2400 source meter to apply voltage to my chip. The test that I am performing

has the following requirements:

In the first stage, I apply DC voltage (from source meter) on one pad (Pad-A) of the chip and ground

(from source meter) on the other pad (Pad - B) and take some capacitance measurements.

In the second stage, I need to swap these voltages i.e. DC voltage to Pad-B and ground to Pad-A.

I am already using a labview code to apply the voltage and make the capacitance measurements.

Is it possible by any chance that I can control the swapping with the labview code automatically,

without having to swap them manually?

Thank you for the help

[Efrain_G]

Hi funny fox,

It will depend on your instrument drivers, but you should be able to do this by adding some extra logic in LabVIEW. You can use a case structure, or even an event structure if you want the user to be able to swap them.

[funnyfox]

Dear Efrain,

Thanks a lot for the response. The drivers I am using are directly downloaded from NI using

labview driver search feature (Keithley 24xx drivers).

Can you please provide me some more details on the logic you were referring to ? I mean

some reference that I can look into or some possible examples.

Thank you

[Henrik_Volkers]

Is it important to switch the GROUND? 

Or do you only need to switch the polarity of the voltage between your pads?

Sometimes it makes a BIG difference 😉