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How to set the PXI4464 terminal configuration properly?

Hi All,

I am measuring a floating signal with the PXI4464, which has 2 types of terminal configuration: Pseudo-differential and differential. In the past, I compared both types for my application and the pseudo-differential was better. The differential mode was creating too much noise. However, suddenly the signal stared having some drops to 5 mV and then going back to the right value, which was screwing up the measurement.

So, I decided to change to Differential mode again, and the signal looked better. Even reading some tutorials about those types of terminal configuration, it is not clear yet which one is the best for my application.

The signal is floating, its maximum value is 22 mV, and I have to use a long BNC cable (20 ft) to connect the system that I am measuring to the PXI4464.

Could someone help me if these differences, and which configuration might be better?

Thank you so much.

 

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