Specifications
OWNER’S GUIDE SIGNAL CONNECTIONS | 8149
8
Signal Connections / Counters
Analog input connections
Because DEWETRON systems are compatible with so
many different DAQ, MDAQ, PAD, EPAD, CPAD, and other
Dewetron modules, please refer to those signal conditioners in
the Appendix for complete details about how to connect your
signals to them.
Choice of Cables
Voltage cables should be instrumentation grade 50 Ω cables
with a braided shield. Using good quality cables can make
the difference between making a good measurement and not.
Why spend thousands of dollars on a powerful data acquisition
system, and then apply low quality cables?
Long cable runs should use twisted pairs, where each pair
is individually shielded. Then the entire cable should have a
shield around all of the pairs, and a high quality insulation.
Thermocouple cables should be instrumentation grade
thermocouple wires with a high quality insulation. It is not
necessary to shield thermocouple cables.
Shielding Best Practices
Normally a cable’s main shield will drain into the ground pin
on the Dewetron side. It is a best practice NOT to connect the
cable drain shield on both sides. This will help you to avoid
ground loops (voltage potential differences which can adversly
influence the measurements.