SPECIFICATIONS
Calibration Traceability
Larson Electronics
solar radiation meters are calibrated through side-by-side comparison to the mean of four
transfer standard pyranometers (shortwave radiation reference) under high intensity discharge metal halide
lamps. The transfer standard pyranometers are calibrated through side-by-side comparison to the mean of at least
two ISO-classified reference pyranometers under sunlight (clear sky conditions) in Logan, Utah. Each of four ISO-
classified reference pyranometers are recalibrated on an alternating year schedule (two instruments each year) at
the National Renewable Energy Laboratory (NREL) in Golden, Colorado. NREL reference standards are calibrated to
the World Radiometric Reference (WRR) in Davos, Switzerland.
ISO 9060:2018
Class C (previously known as second class)
Calibration Uncertainty
± 5 % (see Calibration Traceability below)
Measurement
Repeatability
Less than 1 %
Long-term Drift
(Non-stability)
Less than 2 % per year
Non-linearity
Less than 1 % (up to 1750 W m
-2
)
Response Time
Less than 1 ms
Field of View
180º
Spectral Range
360 to 1120 nm (wavelengths where response is 10 % of maximum;
see Spectral Response below)
Directional (Cosine)
Response
± 5 % at 75º zenith angle (see Cosine Response below)
Temperature Response
0.04 ± 0.04 % per C (see Temperature Response below)
Operating Environment
0 to 50 C; less than 90 % non-condensing relative humidity up to 30 C; less than
70 % non-condensing relative humidity from 30 to 50 C; separate sensors can be
submerged in water up to depths of 30 m
Meter Dimensions
126 mm length; 70 mm width; 24 mm height;
Sensor Dimensions
24 mm diameter; 33 mm height
Mass
150 g
180 g
Cable
2 m of two conductor, shielded, twisted-pair wire; TPR jacket (high water
resistance, high UV stability, flexibility in cold conditions)
Larson Electronics, LLC
Phone: (800) 369-6671
Fax: (903) 498-3364
www.larsonelectronics.com
