Campbell Scientific CR800 and CR850 Measurement and Control Systems - Manual (Page 88)

Section 7. Installation
88
Figure 31: Schematic of grounds
7.5.1.1 Lightning Protection
The most common and destructive ESDs are primary and secondary lightning
strikes. Primary lightning strikes hit instrumentation directly. Secondary strikes
induce voltage in power lines or wires connected to instrumentation. While
elaborate, expensive, and nearly infallible lightning protection systems are on the
market, Campbell Scientific, for many years, has employed a simple and
inexpensive design that protects most systems in most circumstances. It is,
however, not infallible.
Note Lightning strikes may damage or destroy the CR800 and associated sensors
and power supplies.