PiXtend V2 -L- Hardware Manual
The ground connections (GND) of external power supply units must be connected directly
to the GND terminals of the terminal block of the analog inputs.
In the case of analog signals, we strongly advise you to use shielded connection cables.
This is particularly important when the lines are routed in the direct vicinity of large pulsed
currents (e.g., drives) or other sources of interferences.
If PiXtend is used in a metal housing or control box, the shield must be placed on a
grounded and bare metal surface (earthing clamps and screw connections in the DIY store
or electronics dealer). An electrically conductive connection between the GND and the
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Figure 72: Principle circuit diagram: Connection of the sensor supply
Figure 73: Principle diagram: GND connection