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imc C-SERIES - Manual, Version 4 R 3 - 2018-10-19

94 Device description

5.5.1.2 Case 1: Voltage source with ground reference

The voltage source itself already is referenced to

the device's ground. The voltage source is at the

same potential as the device ground.

Example

The measurement system is grounded. Thus, the input GND is at ground potential. If the voltage source

itself is also grounded, it is referenced to the device ground. It isn't any problem if, as it may be, the

ground potential at the voltage source deviates from the ground potential of the device itself by a few

degrees. The maximum permitted common mode voltage must not be exceeded.

Note

In this case, the negative signal input -IN may not be connected to the ground contact GND in the

device. Otherwise, a ground loop would result, through which interference could be coupled in.

In this case, a true differential (but not isolated!) measurement is performed.

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