CRVW3 3-Channel Vibrating-Wire Datalogger
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lightning strikes or other electrical hazards. An example of weatherproofing
installed on a surge suppressor connection is shown in FIGURE
FIGURE 8-14. Properly Weather-proofed Antenna Cable Connection
with Surge Protection
8.2.6 Connecting the CRVW3 Electrical System to Earth Ground
Electrical grounding of the CRVW3 station helps protect your hardware
investment by mitigating against the risk of lightning strikes, static discharges,
or other unexpected electrical conditions. Connect the ground lug to an
adequate earth/soil connection using a low gage wire (8-12 AWG) that
accommodates high current flows.
FIGURE 8-15. CRVW3 Ground Lug Location
The Campbell Scientific small enclosure grounding kit (pn 31163) can be used
to make this connection.
8.2.6.1 Electrostatic Discharge Protection
Electrostatic discharge (ESD) can originate from several sources, the most
common and destructive being lightning strikes. Primary lightning strikes hit
the CRVW3 or sensors directly. Secondary strikes induce a high voltage in
power lines or sensor wires.
The CRVW3 has built-in protection to prevent damage from Electrostatic
Discharge (ESD). It is important to understand that the built-in ESD protection
will be completely ineffective unless the CRVW3 is properly earth grounded at
the installation site.
A good earth (chassis) ground will minimize damage to the datalogger and
sensors by providing a low-resistance path around the system to a point of low
potential. Campbell Scientific recommends that all dataloggers be earth
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