Campbell Scientific CMP6-L, CMP11-L, and CMP21-L Pyranometers - Manual (Page 15)

CMP6-L, CMP11-L, and CMP21-L Pyranometers
6. Specifications
6.1 Pyranometers
TABLE 6-1. CMP-series Specifications
Specification CMP6 CMP11 CMP21
ISO Classification First Class Secondary Standard
Maximum irradiance 2000 W•m –2 4000 W•m –2
Spectral range
(50% points)
285 to 2800 nm
Response time (95 %) <18 s <5 s
Expected daily
uncertainty
<5% <2%
Zero offset due to thermal
radiation
(200 W•m
–2 )
<15 W•m –2 <7 W•m –2
Zero offset due to
temperature change
(5 K•hr
–1 )
<4 W•m –2 <2 W•m –2
Non-stability
(change/year)
<1 % <0.5%
Non-linearity
(0 to 1000 W•m
–2 )
<1% <0.2%
Directional error
(up to 80° with 1000
W•m
–2 beam)
<20 W•m –2 <10 W•m –2
Tilt error
(at 1000 W•m
–2 )
<1% <0.2%
Level accuracy 0.1°
Operating temperature –40° to 80°C
Temperature dependence
of sensitivity
<4% (–10° to +40°C) <1% (–10° to +40°C) <1% (–20° to +50°C)
Sensitivity 5 to 20 µV / W•m –2 7 to 14 µV / W•m –2
Typical signal output for
atmospheric applications
0 to 20 mV 0 to 15 mV
Weight 0.6 kg (1.3 lb) without cable;
0.9 kg (2 lb) with 10 m (33 ft) cable
Impedance* 20 to 200 Ω 10 to 100 Ω
* Impedance is defined as the total electrical impedance at the radiometer output connector fitted to the housing. It
arises from the electrical resistance in the thermal junctions, wires, and passive electronics within the radiometer.
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