4
CONNECTING SENSORS
GS3
Figure 3: Wiring Diagram
NOTE: The acceptable range of excitation voltages is from 3.6 to 15
VDC. If you wish to read the GS3 with the Campbell Scientific Data.
Loggers, you need to power the sensors off of the 12 V port (switched
if you use TTL serial).
If your GS3 is equipped with the standard 3.5 mm plug, and you
wish to connect it to a non-Decagon data logger, you have two op-
tions. First, you can clip off the plug on the sensor cable, strip and
tin the wires, and wire it directly into the data logger.
This has the advantage of creating a direct connection with no chance
of the sensor becoming un-plugged; however, it then cannot be eas-
ily used in the future with a Decagon readout unit or data logger.
The other option is to obtain an adapter cable from Decagon. The
3-wire sensor adapter cable has a connector for the sensor jack on
one end, and three wires on the other end for connection to a data
logger (this type of wire is often referred to as a “pigtail adapter”).
Both the stripped and tinned adapter cable wires have the same ter-
mination as seen above; the white wire is excitation, red is output,
and the bare wire is ground.
Note: Be extra careful to secure your stereo to pigtail adapter con-
nections to ensure that sensors do not become disconnected during
use.
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