Operation And Measurement - Apogee SQ-640 Owner's Manual

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-640
White: Positive (signal from sensor)
Black: Negative (signal from sensor)
Clear: Shield/Ground