What channel configuration should I use: nickname?

I have three terminals of signal; a, a V0 and a V1, with V0 and V1 measured relative to the ground terminal common ground.  There is some contamination of noise in the environment, so I can't ignore the field common and just wire V0 as the Center wire and the V1 as the "field..." I need the wire Earth for the shield.

I want to measure V1 - V0.  I am writing a custom c# application.  It is important to keep as quiet as possible readings and keep the calculations as simple as possible (I know, use C++, not c#, not my choice).

I think that my best option is to configure A0 to read V0 and A1 to read V1, as signals Pseudo-differentiels and then in my find code V1 - V0.  Is this correct? I read the post about the configuration of terminal on the Web site of NOR, but I want to just make sure.

This perhaps relates to the question, but maybe not:

I use an acquisition of data USB-9234.

I don't need the sensor excitation.

V0 and V1 are band including 10 Hz - 1 kHz with analog filters, low noise (slot 50uV), and the signal of interest is band including 65 Hz - 120 Hz.  Voltage max gnd - V0, V1 - V0 and V1 - gnd are all +/-5V.

The signals are low impedance (~ 10ohms).

Thanks for your thoughts!

Hey jcsquire!

You are using a configuration entry Pseudo-differentiels if you want to reduce your sound.  Username is very hard to minimize the ground loops that lead to more specific measures.  With the help of this configuration, I think you would have to measure both independently and deduct out them then maintain your sheilding with the soil line.

In summary, it looks like you know what you're doing.

Ground wiring diagram

Entry Pseudo-differentiels

Tags: NI Hardware

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