Advantech PCI-1723 Manual de usuario descargar pdf (Pagina 34)

PCI-1723 User Manual 28

3.4 Field Wiring Considerations

When you use the PCI-1723 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 help-

ful to reduce possible interference running signal wires between signal

sources and the PCI-1723.

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 interference.

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 inter-

ference, 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 con-

nected 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 distance

between them. Alternatively, you can 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 qual-

ity of the cable. In order to ensure better signal quality, we recommend

that you use the PCL-10168 shielded cable.

1 2 ... 29 30 31 32 33 34 35 36 37 38 39 ... 59 60

Sin comentarios

Advantech PCI-1723 Manual de usuario Pagina 34