datalogger. This system, however, is not infallible. The following image displays a typical
application of the system:
All critical inputs and outputs on the datalogger are ESD protected to 75 V. To be effective, the
earth ground lug must be properly connected to earth (chassis) ground.
Communications ports are another path for transients. You should provide communications
paths, such as telephone or short-haul modem lines, with spark-gap protection. Spark-gap
protection is usually an option with these products; so, request it when ordering. Spark gaps
must be connected to earth (chassis) ground.
For detailed information on grounding, see Grounds (p. 10).
8.6 Power budgeting
In low-power situations, the datalogger can operate for several months on non-rechargeable
batteries. Power systems for longer-term remote applications typically consist of a charging
source, a charge controller, and a rechargeable battery. When ac line power is available, a Vac-
8. Maintaining your datalogger 108
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