19
Chapter 3
3.6 Field Wiring Considerations
• When you use USB-4711A to acquire data from outside, noises in the
environment might significantly affect the accuracy of your measure-
ments if due cautions are not taken. The following measures will be
helpful to reduce possible interference running signal wires between
signal sources and the USB-4711A.
• 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 input 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 place the signal cable in a right angle to the
power line to minimize the undesirable effect.
Summary of Contents for USB-4711A
Page 1: ...USB 4711A 150 kS s 12 bit USB Multifunction Module User Manual...
Page 6: ...USB 4711A User Manual vi...
Page 10: ...USB 4711A User Manual 4...
Page 19: ...13 Chapter3 Figure 3 1 I O Connector Pin Assignment...
Page 26: ...USB 4711A User Manual 20...
Page 27: ...2 APPENDIX A Specifications...
Page 30: ...USB 4711A User Manual 24...