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Spectral Errors for Shortwave Radiation Measurements with 

Larson

 Pyranometers 

Radiation Source (Error Calculated Relative to Sun, Clear Sky) 

Error [%] 

Sun (Clear Sky) 

0.0 

Sun (Cloudy Sky) 

9.6 

Reflected from Grass Canopy 

14.6 

Reflected from Deciduous Canopy 

16.0 

Reflected from Conifer Canopy 

19.2 

Reflected from Agricultural Soil 

-12.1

Reflected from Forest Soil 

-4.1

Reflected from Desert Soil 

3.0 

Reflected from Water 

6.6 

Reflected from Ice 

0.3 

Reflected from Snow 

13.7 

Spectral error for 

Larson

 series 

pyranometers as a function of 
atmospheric air mass, assuming 
calibration at an air mass of 1.5. 

Spectral error for 

Larson

 series 

pyranometers as a function of solar 
zenith angle, assuming calibration at 
a zenith angle of 45°. 

Larson Electronics, LLC

 

  Phone: (800) 369-6671 

 Fax: (903) 498-3364 

  www.larsonelectronics.com 

Summary of Contents for XLE-HHLM-VISNIR-360NM.1200NM-V1

Page 1: ...OWNER S MANUAL SOLAR RADIATION METER Part XLE HHLM VISNIR 360NM 1200NM V1 Larson Electronics LLC Phone 800 369 6671 Fax 903 498 3364 www larsonelectronics com...

Page 2: ...rnational Organization of Standardization ISO second class and first class classifications but because of limited spectral sensitivity they do not meet the spectral specification necessary for WMO or...

Page 3: ...rtainty 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...

Page 4: ...a for the photodiode were obtained from the manufacturer Mean temperature response of four Larson silicon cell pyranometers Temperature response measurements were made at approximately 10 C intervals...

Page 5: ...rado Cosine response was calculated as the relative difference of pyranometer sensitivity at each solar zenith angle to sensitivity at 45 solar zenith angle The blue symbols are AM measurements the re...

Page 6: ...ogged measurements on the LCD display Logging To choose between manual or automatic logging push the mode button once and use the up down buttons to make the appropriate selection SMPL or LOG Once the...

Page 7: ...fers in clear sky and cloudy conditions thus measurements in cloudy conditions result in spectral error because sensors are calibrated in clear sky conditions Spectral response of Larson series pyrano...

Page 8: ...m Agricultural Soil 12 1 Reflected from Forest Soil 4 1 Reflected from Desert Soil 3 0 Reflected from Water 6 6 Reflected from Ice 0 3 Reflected from Snow 13 7 Spectral error for Larson series pyranom...

Page 9: ...acy the sky must be completely clear as reflected radiation from clouds causes incoming radiation to increase above the value predicted by the clear sky calculator Measured values of total shortwave r...

Page 10: ...nt draw This is necessary to maintain the logged measurements in memory Therefore it is recommended to remove the battery when storing the meter for many months at a time in order to preserve battery...

Page 11: ...PU voltage below minimum Fix replace CR2320 battery and perform master reset Larson Electronics LLC Phone 800 369 6671 Fax 903 498 3364 www larsonelectronics com THESE INSTRUCTIONS MAY NOT COVER ALL D...

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