Campbell Scientific TORO® NW8002 Weather Station Installation - Manual (Page 32)

3-5
FIGURE 3.2-1 4831 Temperature/Relative Humidity Probe Assembly
Measure the resistance of the temperature
probe by connecting the ohm meter across the
red and black leads. The temperature sensor
has a inverse relationship between resistance
and temperature, the higher the ambient
temperature the lower the resistance of the
probe. If the temperature readings are high,
visually inspect the leads of the thermistor to
see if condensation or bugs have caused an
alternate electrical path of lower resistance.
If just the RH readings are bad, then the RH
Chip most likely needs to be replaced.
NOTE: Contact your Toro distributer for
RH chip replacement.
3.3 DATALOGGER (CR10)
The CR10 is the heart of the weather station, it
measures the sensors, outputs, and converts
the measurements to engineering units. Upon
request from the computer, the CR10 will
transmit the data to the computer. The best
way to check the CR10 is with the CR10KD.
3.3.1 KEYBOARD DISPLAY
The CR10KD is used to check all functions of
the CR10 as well as checking sensor values.
Connect the CR10KD to the 9 pin ribbon cable
inside the enclosure. Upon connection, the
display activates, showing meaningless
numbers. Enter *0, and the display should
show LOG12. The steps in Table 3.3-1 allow
verification of the actual sensor measurements.
When viewing the display, remember that the
CR10 obtains a new measurement every 60
seconds.