Campbell HC2S3, Product Manual, Page: 16 / 42

Model HC2S3 Temperature and Relative Humidity Probe
8
TABLE 7-1. Wire Color, Function, and Datalogger Connection for
Single-Ended Measurement
Wire
Color Wire Function Datalogger Connection Terminal
Brown
Temperature
signal
U configured for single-ended analog input 1 ,
SE
(single-ended, analog-voltage input)
White
Relative
humidity signal
U configured for single-ended analog input,
SE
Yellow Signal reference
⏚
(analog ground)
Gray Power ground
⏚
Clear Shield ⏚
Green Power 12V or SW12V
1 U channels are automatically configured by the measurement instruction.
When measuring the HC2S3 with single-ended
measurements, the yellow and gray leads must both be
connected to ⏚ on the datalogger. Doing otherwise will
connect the datalogger’s analog and power ground planes
to each other, which in some cases can cause offsets on
low-level analog measurements. To avoid 2 mA flowing into
analog ground, switch power on/off for its measurement.
TABLE 7-2. Wire Color, Function, and Datalogger Connection for
Differential Measurement
Wire Color Wire Function Datalogger Connection Terminal
Brown Temperature signal
U configured for differential
analog input H 1 ,
Diff H
Jumper to
Yellow
Temperature signal
reference
U
configured for differential
analog input L, Diff L
White
Relative humidity
signal
U configured for differential
analog input H, Diff H
Yellow Signal reference
U configured for differential
analog input L, Diff L
Gray Power ground G
Clear Shield ⏚
Green Power 12V or SW12V
1 U channels are automatically configured by the measurement instruction.
CAUTION