Current measurements between 4071 and 2575 sometimes not correct

I'm using PXI-4071 and a PXIe-2575 in handshaking mode with a scan list.
The DMM is measuring current and the MUX is in 1x196 mode.
When running the scan list, I rarely (randomly) get a very small measurement in the nA to uA (when it should be 4-20mA). I'll run the scan list again and that channel will be correct, so it doesn't seem to correspond to a channel.
I've tried increasing the settling time of both the DMM and the MUX, but neither have had any effect.
Any help would be great.
Thanks,
Caleb Swieson
Solved!
Go to Solution.

Cswieson,
Is the relay board relatively old? If a board is close to end of life, there is a chance that the relay will sporatically not close and/or open. If the relay is stuck open, the DMM might measure very low current because no current is flowing (and only noise is coming through).
Frank,
National Instruments
Staff Software Project Engineer

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I used NI 4071 to measure a high resistance. The resistance is 78.6MΩ.
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Hi faili,
I have never witnessed this issue before, so I attempted to reproduce your problem. I used the following hardware:
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Wired COM+ (50-pin DSub pin 23) to DMM HI Lead, COM- (50-pin DSub pin 24) to DMM LO Lead
With DMM, measured COM+ to COM- (after settling) = 75.6MΩ
So, I wasn't able to reproduce your issue. Perhaps the above will help. Can you tell me more about your system and how it is configured? Perhaps there is a hidden resistance to GND somewhere in your setup. Looking at the equation, to receive an error of:
78.6MΩ -76.4MΩ = 2.2MΩ (or 2.8%)
you could have a hidden 2.73GΩ path to GND. How are you making your connections to the PXI-2575? Just a thought...
Let me know if you have further questions or if this does not resolve your issue!Chad Erickson
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Current measurements between 4071 and 2575 sometimes not correct

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