Setting a constant voltage at analog output of NI PCI6110 DAQ Board till I acquire signals from the analog inputs

[dg88]

Hello,

I am trying to take IV (Current vs Voltage) measurements using a Kepco power supply. I do not have to communicate with this power supply using GPIB or any such methods. I have connected one of the analog outputs of my PCI 6110 DAQ Board to the Kepco, which gives me twice the voltage at the analog port. I have two analog outputs. I want to set one of these outputs to -6V while I vary the other one (connected to the Kepco) within the user specified limits varying with user specified voltage steps. Hence, the output at -6 Volt should be maintained while I vary the applied voltage and read the current (whose duration might vary depending on step size and limits). I was hoping to use DAQ assist for this. I would really appriciate some suggesions on this.

Regards

DG

[TimmTheEnchanter]

Hi DG,

If I understand you right, you want to control the two outputs of the 6110 independently, one as a stable -6v, and the other one varying.  Are you connecting these outputs in any way?  Or do they run straight into two separate receiver ports on the Kepco device?  As a suggestion, it may be easier to understand what you're trying to do with a schematic.

If you're just looking for advice on how to use the DAQ Assistant, I searched online and found Configuring DAQ Assistant (Analog Output) and How To Use DAQ Assistant For Analog Output on Multiple Channels, which shows how to control multiple outputs with one DAQ Assistant by bundling with arrays.

All of this can be done through the DAQmx API as well.  I'd recommend Learn 10 Functions in DAQmx as reading material.

Hope this helps,

Andrew