Campbell CVF4 Manuál s instrukcemi Strana 32

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CMP6-L, CMP10-L, CMP11-L, and CMP21-L Pyranometers
25
pyranometers can fall as low as the dew point temperature of the air, due to
infrared radiation exchange with the cold sky. The effective sky temperature
can be 30°C lower than the ground temperature, which results in an infra-red
emission of 150 W
m
2
. If this happens, dew, glazed frost or hoar frost can be
precipitated on the top of the outer dome and can stay there for several hours in
the morning. An ice cap on the dome is a strong diffuser and can increase the
pyranometer signal by up to 50% in the first hours after sunrise.
8.4 Recalibration
The calibration of the pyranometer may drift with time and exposure to
radiation. Recalibration every two years is recommended. The sensor should
be returned to Campbell Scientific for recalibration. A Returned Materials
Authorization (RMA) is required (refer to the Assistance page for more
information).
9. Troubleshooting
Symptom: NAN, 9999, or radiation values around 0
1. Check that the sensor is wired to the differential channel specified by the
measurement instruction.
2. Verify that the range code is correct for the datalogger type.
3. Measure the impedance across the red and blue sensor wires. This should
be around 100 ohms plus the cable resistance (typically 0.1 ohmm
1
). If
the resistance is very low, there may be a short circuit (check the wiring).
Resistances somewhat lower than expected could be due to water ingress
into the sensor or enclosure connectors. If the resistance is infinite, there
is a broken connection (check the wiring).
4. Disconnect the sensor cable and check the voltage output from the sensor.
With the sensor located 8” below a 60 W incandescent light bulb the
voltage should be approximately 2.5 mV. No voltage indicates a problem
with the sensor.
Symptom: sensor signal is unrealistically high or low
1. Check that the right calibration factor has been properly entered into the
datalogger program. Please note that each sensor has its own individual
calibration factor.
2. Check the condition of the sensor cable.
Symptom: sensor signal shows unexpected variations
1. Check for the presence of strong sources of electromagnetic radiation
(radar, radio, etc.).
2. Check the condition and the connection of the sensor shield wire.
3. Check the condition of the sensor cable.
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