Advantech MIC-3723, User Manual

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MIC-3723/3723R User Manual 34
3.4 Field Wiring Considerations
When you use the MIC-3723/3723R to acquire data from external
sources, noises in the environment could significantly affect the accuracy
of your measurements if due cautions are not taken. The following mea-
sures will be helpful to reduce possible interference running signal wires
between signal sources and MIC-3723/3723R.
• The signal cables must be kept away from strong electromagnetic
sources such as power lines, large electric motors, circuit breakers or
welding machines, since they may cause strong electromagnetic inter-
ference. Keep the analog signal cables away from any video monitor,
since it can significantly affect a data acquisition system.
• If the cable travels through an area with significant electromagnetic
interference, you should adopt individually shielded, twisted-pair wires
as the analog output cable. This type of cable has its signal wires
twisted together and shielded with a metal mesh. The metal mesh
should only be connected to one point at the signal source ground.
• Avoid running the signal cables through any conduit that might have
power lines in it.
• If you have to place your signal cable parallel to a power line that has a
high voltage or high current running through it, try to keep a safe dis-
tance between them. Or, you should place the signal cable at a right
angle to the power line to minimize the undesirable effect.
• The signals transmitted on the cable will be directly affected by the
quality of the cable. In order to ensure better signal quality, we recom-
mend that you use the PCL-10168 shielded cable.