Apogee Instruments SQ-642 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 0-2.5 V (SQ-642) or 0-5 V (SQ-645) is
required to cover the entire range of PFD from the sun). To maximize measurement resolution and signal-to-noise
ratio, the input range of the measurement device should closely match the output range of the extended range
PFD sensor. DO NOT connect the sensor to a power source greater than 24 V DC.
Wiring for SQ-642 and SQ-645
White: Positive (signal from sensor)
Red: Input power (SQ-642 5-24 V DC, SQ-645 5.5-
24 V DC)
Black: Ground (for sensor signal and input power)
Clear: Shield/Ground