Honeywell CADVR-04D User Manual page 232

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Mixed ground: The mix ground consists of the feature of the one-point
ground and multiple-point ground. For example, the power in the system
needs to use the one-point ground mode while the radio frequency
signal requires the multiple-point ground. So, you can use the following
figure to earth. For the direct current (DC), the capacitance is open
circuit and the circuit is one-point ground. For the radio frequency signal,
the capacitance is conducive and the circuit adopts multiple-point
ground.
When connecting devices of huge size (the device physical dimension
and connection cable is big comparing with the wave path of existed
interference), then there are possibility of interference when the current
goes through the chassis and cable. In this situation, the interference
circuit path usually lies in the system ground circuit.
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