Campbell Scientific CR3000 Micrologger - Manual (Page 94)

Section 7. Installation
94
Note Lightning strikes may damage or destroy the CR3000 and associated
sensors and power supplies.
In addition to protections discussed in ESD Protection
(p. 92),
use of a simple
lightning rod and low-resistance path to earth ground is adequate protection in
many installations. A lightning rod serves two purposes. Primarily, it serves as a
preferred strike point. Secondarily, it dissipates charge, reducing the chance of a
lightning strike. Figure Lightning-Protection Scheme
(p. 94)
shows a simple
lightning-protection scheme utilizing a lightning rod, metal mast, heavy-gage
ground wire, and ground rod to direct damaging current away from the CR3000.
Figure 34: Lightning-protection scheme