Campbell Scientific PWC100 Present Weather Sensor Calibrator - Manual (Page 17)

PWC100 Present Weather Sensor Calibrator
It is also recommended that the operator stands behind the laser hood while the
PWS is active.
6. Electrical Parameters
6.1 PWC100 Voltages and Currents
Nominal Max Notes
General details
Standby current 29 mA 30 mA No tests running
Operating current 125 mA 150 mA Disk rotating at test
speed
Spin up current 500 mA 700 mA Disk spinning up to
speed
+ Volts +12 V +2 8V Main supply voltage
6.2 Earth, 0 V and Transient Protection
The user must ensure that the ground lug on the PWS is connected to the earth
lug on the logger or another suitable termination point. The PWC100 is
connected to this earth via the umbilical cable. This connection acts as the
discharge path for electrical transients such as static and surge. Failure to
correctly terminate this connection could lead to damage to the unit or faulty
operation.
The PWC100 is protected against external electrostatic discharges from user
contact but not lightning related surges caused by nearby strikes. Therefore, do
not leave the PWC100 connected to the PWS100 for prolonged periods in field
conditions.
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