Campbell Scientific NR01 Net Radiometer - Manual (Page 38)

NR01 Four-Component Net Radiation Sensor
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6.2 Troubleshooting
This table contains information used to diagnosis problems whenever the
sensor does not function properly.
TABLE 6.2-1. Troubleshooting for the NR01
The sensor does
not give any
signal Typically an error is due to either a short circuit or an
open connection. Both can be detected by impedance /
resistance measurements at the cable end.
In case of open circuits: open the instrument and check
the internal connections (see wiring diagram of Table 4.2-
1.)
The sensor signal
is unrealistically
high or low. Check if the right calibration factors are entered into the
algorithm. Please note that each sensor has its own
individual calibration factor.
Check if the voltage reading is divided by the calibration
factor by review of the algorithm.
Check the condition of the leads at the logger.
Check the cabling condition looking for cable breaks.
Check the data acquisition by applying an mV source to it
in the 1 mV range.
Perform a sensor-inversion test as written down in 4.5.
Open the instrument and check the internal connections
(see wiring diagram of Table 4.2-1).
The sensor signal
shows
unexpected
variations Check the presence of strong sources of electromagnetic
radiation (radar, radio etc.)
Check the condition of the shielding.
Check the condition of the sensor cable.
Open the instrument and check the internal connections
(see wiring diagram of Table 4.2-1).