Apogee SQ-215 Manual del usuario - Página 12
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Sensor Calibration
Apogee amplified quantum sensor models 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 (0.5 µmol m
0.5
Full Sunlight
(2000 µmol m
-2
s
-1
)
SQ-212, SQ-222: 1.0 µmol m
SQ-215, SQ-225: 0.5 µmol m
s
per mV) * Sensor Output Signal (mV) = PPFD (µmol m
-2
-1
*
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
yields an output signal of 4000 mV for the 0-5 V option or an output signal of 2000 mV for
the 0-2.5 V option. The signal is converted to PPFD by multiplying by the calibration
factor.
Sensor Output: 4 V
SQ-215/225
Conversion Factor: 0.5 µmol m
Sensor Output: 2 V
SQ-212-222
Conversion Factor: 1.0 µmol m
-2
s
-1
per mV
s
per mV
-2
-1
4000
=
2000
-2
s
-1
per mV
-2
s
-1
per mV
s
:
-2
-1
s
)
-2
-1
-2
s
-1
. This
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