Apogee SQ-100X Series Owner's Manual - Page 12

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Sensor Calibration
All Apogee unamplified quantum sensor model (SQ-100X) have a standard PPFD calibration factor of exactly:
Multiply this calibration factor by the measured mV signal to convert sensor output to PPFD in units of µmol m
Calibration Factor (10.0 µmol m
10.0
Full Sunlight
(2000 µmol m
-2
10.0 µmol m
-2
-1
s
per mV) * Sensor Output Signal (mV) = PPFD (µmol m
*
s
-1
)
Sensor Output
200 mV
-2
-1
s
per mV
200
=
Example of PPFD measurement with an Apogee
quantum sensor. Full sunlight yields a PPFD on
a horizontal plane at the Earth's surface of
approximately 2000 µmol m
output signal of 200 mV. The signal is
converted to PPFD by multiplying by the
calibration factor of 10.00 µmol m
-2
-1
s
:
-2
-1
s
)
2000
-2
-1
s
. This yields an
-2
-1
s
per mV.