Campbell Scientific CR1000KD CR1000 Measurement and Control System - Page 88
Lightning Protection
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Section 7. Installation 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 CR1000 and associated sensors and power supplies. In addition to protections discussed in ESD Protection (p. 86), 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 88
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