![background image](http://html1.mh-extra.com/html/omega/usb-4750/usb-4750_user-manual_4190588021.webp)
3.4 Field Wiring Considerations
• When you use USB-4750 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-4750.
• 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.
USB-4750 User Manual
16
Содержание USB-4750
Страница 3: ...USB 4750 32 Channel Isolated Digital I O USB Data Acquisition Module User Manual...
Страница 5: ...USB 4750 User Manual vi...
Страница 6: ...1 2 Introduction Sections include Hardware Features Software Overview...
Страница 9: ...USB 4750 User Manual 4...
Страница 10: ...2 2 Installation Sections include Unpacking Driver Installation Hardware Installation Hardware Uninstallation...
Страница 16: ...3 2 Signal Connections Sections include Overview Isolated Digital I O Connections Field Wiring Considerations...
Страница 22: ...A 2 Specifications...