Kipp&Zonen CNR 4 Net Radiometers - Manual (Page 20)

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Irradiance: W/m² 0 to 2000
Definition Measurement range
Non-stability % < 1
Definition Maximum change of sensitivity per year, percentage of full scale
Spectral selectivity % < 3% (350 – 1500 nm spectral interval)
Definition
Deviation of the product of spectral absorption and spectral
transmittance from the corresponding mean within the indicated
spectral range
Uncertainty in daily total % < 5 (95 % confidence level)
Definition Achievable uncertainty
International standards
WMO
ISO Good quality
First Class
Instrument calibration
Indoors, side by side against reference CMP 3 pyranometer
according to ISO 9847:1992 annex A.3.1