Common ground for a precise measurement and analysis

Hi all

I wanted your opinion on input and analog output configurations. Connect us two resistors in series and provide an output signal analogue sine through it 10 V. Then, we measure the potential across the two resistors using differential input configurations, on the channels 0 and 1 AI. What I am curious about it is:

(1) do we connect the ground of the analog output and analog input mass together?

(2) if they are interconnected, so am I right in saying that the two potentials measured on the differentialchannel are referenced to a common ground?

(3) that help to improve SNR?

Will be grateful for your responses. (Two resistances here are an example of simulating loads through which am measure potential).

see you soon,

As mentioned, usually GND terminals are connected internally, so there is no real need for an additional connection between the GND AI and AO GND Terminal.

If you connect to them outwardly there is risk of creating a "ground loop", i.e. a closed circuit which cover a certain area that can capture the sounds of the environment. "Double earthing" should generally be avoided. However, perhaps in your configuration you will not see a noticeable difference with or without external connection - but it is evidence that the theory is wrong.

Tags: NI Hardware

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