Advantech Carbon Monoxide Alarm PCI-1718 Series User Manual

When you use PCI-1718 cards 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-1718 card.

•  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. 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 

quality of the cable. In order to ensure better signal quality, we recom-
mend that you use the PCL-10137 shielded cable.