Campbell-scientific CMP6-L, CMP11-L, and CMP21-L Pyranometers Uživatelský manuál stáhnout pdf (Strana 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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