Apogee SQ-100 Series Owner's Manual - Page 10

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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

-2

-1

Calibration Factor (5.0 µmol m

5.0

5.0 µmol m

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-1

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

-1

per mV.

-1

per mV

400

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-1

)

2000

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-1

. This

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