Campbell CM3, Instruction Manual, Page: 6 / 16

CM3 Pyranometer
2
Temperature Dependence of
sensitivity:
+ 6% (-10 to + 40ºC)
Tilt response (+80º) (at 1000 W/m
2
): < + 2%
OTHER SPECIFICATIONS
Expected accuracy for daily sums: + 10%
Spectral range (50% points, nm): 305-2800 nm
Sensitivity:
10 - 35
µ
V/Wm
-2
Expected signal output in atmospheric
application:
0 - 50 mV
Impedance:
79 - 200 (
Ω
)
Operating Temperature: -40 to +80ºC
Max. irradiance: 2000 Wm
-2
Detector: Copper-constantin multi junction
thermopile
Cable length: 15 feet (5 m)
Level accuracy: 1 degree
DIMENSIONS / SHIPPING DIMENSIONS
CM3: 3x3x3 in / 6x6x6 in
CM3MT: 1x5x5 in / 6x6x6 in
WEIGHT/SHIPPING WEIGHT
CM3: 0.8 lbs / 3 lbs
CM3MT: 0.6 lbs / 3 lbs
3. Installation
The CM3 should be mounted such that it is never shaded by the tripod/tower or
other sensors.
To ensure accurate measurements, the CM3 should be mounted using the
CM3MT base/leveling fixture or equivalent. The CM3MT incorporates a
bubble level and three adjustment screws. Mount the CM3 Pyranometer to the
CM3MT mount using the two long screws provided. The screws are slightly
shorter than ideal but should provide adequate holding strength.