Apogee SQ-300 Series Kullanıcı El Kitabı - Sayfa 10

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Ayrıca Apogee SQ-300 Series için: Kullanıcı El Kitabı (2 sayfalar)

OPERATION AND MEASUREMENT

Connect the sensor to a measurement device (meter, datalogger, controller) capable of measuring and
displaying or recording a millivolt signal (an input measurement range of approximately 0-500 mV is
required to cover the entire range of PPF from the sun). In order to maximize measurement resolution
and signal-to-noise ratio, the input range of the measurement device should closely match the output
range of the quantum sensor. DO NOT connect the sensor to a power source. The sensor is self-
powered and applying voltage will damage the sensor.
All Apogee un-amplified quantum sensor models (SQ-100 and SQ-300 series) have a standard PPF
calibration factor of exactly:
Multiply this calibration factor by the measured mV signal to convert sensor output to PPF in units of µmol
m
-2
s
-1
:
Calibration Factor (5.0 µmol m
5.0
5.0 µmol m
-2
-2
-1
s
per mV) * Sensor Output Signal (mV) = PPF (µmol m
*
Example of PPF measurement with an Apogee quantum
sensor. Full sunlight yields a PPF on a horizontal plane at
the Earth's surface of approximately 2000 µmol m
yields an output signal of 400 mV. The signal is converted to
PPF by multiplying by the calibration factor of 5.00 µmol m
s
-1
per mV.
s
-1
per mV
400
-2
-1
s
)
=
2000
-2
s
-1
. This
10
-2