SCB 68 rigged with potentiometer, have problems...

[I am preparing a graduate in the laboratory material that I work so much that I apologize in advance if I misuse of terminology, I'm not quite familiar with it]

I have a SCB-68 block connected to a computer through a PCI-6289.  I can see the device in MAX and he claims an automatic test.

I'm trying to wire two 5V linear potentiometers in the block.  Right now, I have the one with the power and return the wires in the terminals of screws 68 and 67, which tells me that the pinout diagram are AI0 and AIGND.  The potentiometer should vary from ~ 0V full extension to 5V to complete removal.  Instead, run a test on results AI0 massive fluctuations not correlated randomly.

Another question here suggested he switch to A1, I did, but no other results so I moved them back.

Someone has any advice on how wire properly this configuration?  Thank you.

Problem solved.  It turns out that the problem was because I was in differential mode, I needed to have the two wires on the pot in two separate channels.  Hang them up to AI1 and AI9, everything works as it should.  Logic wants future pots can be added in channels 2-10, 3-11 and so on.

Thanks for the help.

Tags: NI Hardware

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