Apogee SP-214-SS Owner's Manual - Page 12
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Sensor Calibration
Serial Number Range 0-9996. Apogee SP-214 pyranometer models have a standard calibration factor of exactly:
Multiply this calibration factor by the difference of the measured mA signal and the 4.0 mA offset to convert
sensor output to total shortwave radiation in units of W m
Calibration Factor (78 W m
-2
m
)
78
Serial Number Range 9997 and above. Apogee SP-214 pyranometer models have a standard calibration factor of
exactly:
Multiply this calibration factor by the difference of the measured mA signal and the 4.0 mA offset to convert
sensor output to total shortwave radiation in units of W m
Calibration Factor (125 W m
-2
m
)
125
Full Sunlight
-2
(1000 W m
)
-2
78 W m
per mA with a 4.0 mA offset
-2
per mA) * [Sensor Output Signal (mA) – Offset (4.0 mA)] = Shortwave Radiation (W
*
(16.8
–
-2
125 W m
per mA with a 4.0 mA offset
-2
per mA) * [Sensor Output Signal (mA) – Offset (4.0 mA)] = Shortwave Radiation (W
*
(12.0
–
Sensor Output
12.0 mA
-2
:
4)
=
-2
:
4)
=
Serial Numbers Range 0-9996. Example of total
shortwave radiation measurement with an Apogee SP-
214 pyranometer. Full sunlight yields total shortwave
radiation on a horizontal plane at the Earth's surface of
approximately 1000 W m
of 16.82 mA. The signal is converted to shortwave
radiation by subtracting the 4.0 mA offset and then
multiplying by the calibration factor of 78 W m
mA.
Serial Numbers 9997 and above. Example of total
shortwave radiation measurement with an Apogee SP-
214 pyranometer. Full sunlight yields total shortwave
radiation on a horizontal plane at the Earth's surface of
approximately 1000 W m
of 12.0 mA. The signal is converted to shortwave
radiation by subtracting the 4.0 mA offset and then
multiplying by the calibration factor of 125 W m
mA.
1000
1000
-2
. This yields an output signal
-2
per
-2
. This yields an output signal
-2
per