Analog Input Connections - Advantech PCI-1713 User Manual

In addition to pacer triggering, the PCI-1713 card also allows external
triggering for A/D conversions. A low-to-high edge coming from
EXT_TRG will trigger an A/D conversion on the PCI-1713 board.
Note!: Don't connect any signal to the EXT_TRG pin when the
external trigger function is not being used.
Note!: If you use external triggering for A/D conversions, we
recommend you choose differential mode for all analog
input signals, so as to reduce the cross-talk noise
caused by the external trigger source.
When you use the PCI-1713 card to acquire outside data, environ-
mental noise can seriously affect the accuracy of your measurements
if you don't provide any protection. The following suggestions will be
helpful when running signal wires between signal sources and the
PCI-1713 card.
• Please make sure that you have carefully routed signal cables to the
card. You must separate the cabling from noise sources. Try to keep
video monitors far away from the analog signal cables, because
these are a common noise source in a PCI data acquisition system.
• If you want to reduce common-mode noise, try to use differential

analog input connections.

• If you do not want your signals to be affected when travelling
through areas with high electromagnetic interference or large
magnetic fields, try the following routing techniques: Use
individually shielded, twisted-pair wires to connect analog input
signals to the board, i.e. the signals connected to the High and Low
inputs are twisted together and covered with a shield. Finally,
connect the shield only to one point at the signal source ground.
Chapter 3 Signal Connections 17