Kipp&Zonen CNR 4 Net Radiometers - Manual (Page 24)

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Definition Instrument sensitivity within a specific spectral range
Sensitivity µV/W/m² 5 to 15
Definition Calibration factor
Impedance Ω 20 to 200, typically 50
Definition Typical resistance measured at the output
Response time s
< 18 (95% response)
Definition Sensor response time
Non-linearity % < 1 (from -250 to +250 W/m 2 irradiance)
Definition
Maximum deviation from the responsivity at -100 W/m 2 due to
any change of irradiance within the indicated range.
Temperature dependence of
sensitivity
%
N/S (- 40 °C to -10°C)
< 4 (- 10 °C to +40 °C)
N/S (+40 ºC to +80 ºC)
Definition
Maximum error due to any change of ambient temperature with
the indicated interval.
Tilt error % < 1 deviation when tilted at any angle off horizontal.
Definition
Maximum deviation from the responsivity at angular tilt with
1000 W/m² beam.
Window heating offset W/m² < 6 (0 to 1000 W/m² / solar irradiance)
Definition Caused by heating of the dome due to solar radiation
Field of view:
Upper detector
Lower detector
180º
150º
Definition Sensor opening angle
Net irradiance range: W/m 2 -250 to +250
Definition Measurement range
Non-stability % < 1
Definition Maximum change per year, percentage of full scale
Spectral selectivity % < 5 (8 – 14 µm spectral range)
Definition
Deviation of the product of spectral absorption and spectral
transmittance from the corresponding mean within the indicated
spectral range
Environmental humidity 0 - 100% RH
Definition Intended for continuous outdoor use
Uncertainty in daily total % < 10 (95 % confidence level) Indoor calibration
Definition Achievable uncertainty
Temperature sensor Thermistor and Pt-100
International standards
WMO
ISO
Standards are not available
Instrument calibration
Indoors, side by side against reference CG(R) 3 pyrgeometer
On request outdoors, side by side against reference CG(R) 4
pyrgeometer