Apogee Instruments SQ-620 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 0-200 mV is required to cover the
photon flux density range the sensor is capable of measuring). In order to maximize the measurement resolution
and signal-to-noise ratio, the signal input range of the measurement device should closely match the output range
of the PFD sensor.
Wiring for SQ-620
Black: Negative (signal from sensor)
Clear: Shield/Ground
White: Positive (signal from sensor)