	SP-510 Upward-looking	SP-610 Downward-looking
Sensitivity (variable from sensor to sensor, typical values listed)	0.057 mV per W m^-2	0.15 mV per W m^-2
Calibration Factor (reciprocal of sensitivity; variable from sensor to sensor, typical values listed)	17.5 W m^-2 per mV	6.7 W m^-2 per mV
Calibration Uncertainty	± 5 %	± 5 %
Output Range	0 to 114 mV	0 to 300 mV
Measurement Range	0 to 2000 W m^-2 (net shortwave irradiance)	0 to 2000 W m^-2 (net shortwave irradiance)
Measurement Repeatability	Less than 1 %	Less than 1 %
Long-term Drift	Less than 2 % per year	Less than 2 % per year
Non-linearity	Less than 1 %	Less than 1 %
Detector Response Time	0.5 s	0.5 s
Field of View	180°	150°
Spectral Range (50 % points)	385 to 2105 nm	295 to 2685 nm
Directional (Cosine) Response	Less than 30 W m^-2 at 80° solar zenith	Less than 20 % for angles between 0 and 60°
Temperature Response	Less than 5 % from -15 to 45 C	Less than 5 % from -15 to 45 C
Zero Offset A	Less than 5 W m^-2; Less than 10 W m^-2 (heated)	Less than 5 W m^-2; Less than 10 W m^-2 (heated)
Zero Offset B	Less than 5 W m^-2	Less than 5 W m^-2
Operating Environment	-50 to 80 C; 0 to 100 % relative humidity	-50 to 80 C; 0 to 100 % relative humidity
Heater	780 Ω, 15.4 mA current draw and 185 mW power requirement at 12 V DC	780 Ω, 15.4 mA current draw and 185 mW power requirement at 12 V DC
Uncertainty in Daily Total	Less than 5 %	Less than 5 %
Dimensions	28.7 mm diameter; 23.5 mm height	28.7 mm diameter; 23.5 mm height
Mass (with 5 m of cable)	90 g	100 g

SP-510
Upward-looking

SP-610
Downward-looking

Sensitivity (variable from sensor to sensor, typical values listed)

0.057 mV per W m^-2

0.15 mV per W m^-2

Calibration Factor (reciprocal of sensitivity; variable from sensor to sensor, typical values listed)

17.5 W m^-2 per mV

6.7 W m^-2 per mV

Calibration Uncertainty

± 5 %

Output Range

0 to 114 mV