Campbell Scientific CR200/CR200X-series Dataloggers - Manual (Page 69)

Section 7. Grounding
Figure 36: Lightning Protection Scheme
7.2 Single-Ended Measurement Reference
Low-level single-ended voltage measurements are sensitive to ground potential
fluctuations. Although the CR200(X) is not sensitive enough for low-level
measurements and ground potential fluctuations are not usually a problem, the
grounding scheme in the CR200(X) has been designed to eliminate ground
potential fluctuations due to changing return currents from SW Battery,
excitation channels, and the control ports. This is accomplished by utilizing
separate signal and shield grounds ( ) and power grounds (G). To take
advantage of this design, observe the following grounding rule:
Note Always connect a device's ground next to the active terminal associated
with that ground. Several ground wires can be connected to
the same ground terminal.
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