Campbell NR-Lite Instruction Manual - page 20
NR-LITE Net Radiometer
14
• If this appears to produce no results, measure the impedance of the sensor
across the white and green wires. The impedance reading should be close
to 2.3
Ω. If it is virtually zero, a short circuit is indicated. If it is ‘infinite’,
the thermopile is blown.
7.3 Readings are not as expected
• Under full sunlight the expected radiation value is about 1000 W m
-2
.
Under lamps it may be greater. For indoor climate studies, smaller values
are to be expected unless solar radiation is present. A typical value for a
room when facing a wall and a relatively cold window is 50 W m
-2
.
• Are you using the correct calibration factor? Note that this factor is unique
for each individual sensor as noted on the calibration certificate provided
with that sensor. Did you convert the factor to the correct value for the
datalogger program? (See Section 5, above).
• Check the datalogger program for errors.
If you cannot resolve your problems, please contact Campbell Scientific for
further advice.