Why two soil types?

Hello

I'm a teacher-assistant manager of a few sessions in the laboratory where mechanical engineering students use the MyDAQ modules to learn more about the measures. In one experiment, we use both the 5V and +/-15V power sources a wheatstone bridge connected to an amplification of the IC (INA126). I assumed that since ALWAYS is the reference for sources of 15V and DGND is the reference for the 5V source, it will be best to ALWAYS connect both DGND to constant rail of our circuit, assuming I want exact supply voltages. However, doing so lead to any noise more or less brought to the circuit by the MyDAQ only against connect a ground (ALWAYS or DGND but not both)? We know the circuit "will work" with one of connected patterns, as a measure of resistance of DMM on unity of myDAQ by itself indicates as ALWAYS and DGND are linked together in their own countries in any case. One of my colleagues suggested that this would produce less noise only ALWAYS connect, but not DGND to this circuit. I ALWAYS thought and DGND should all be both be connected to the common rail to the circuit to avoid a possible ground loop/bias. Thank you for everything you can give me advice!

Brian

Hi Brian,.

ALWAYS and DGND connected to the same land. They resemble a COM port. They should be no concern on the ground loops because the two ports are the same pattern.

If you do not see different when behaviors the two different ground ports, let me know.

Best regards

Tags: NI Products

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