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USB-Serial
Converter
Optical testload
connects to
Optical port on
instrument to
simulate optical
readings to test
instrument
Figure 15
String Pot #SC160
String Pot Cable
Connects stringpot to
instrument
Figure 14
EC testload
connects to EC port
on instrument to
simulate EC readings
to test instrument
2-9
OM Reference block
Used to simulate light
and dark readings for
optical sensor
EC Dipole tester
connects between
the brass pin and EC
tip to simulate EC
readings
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