Advantech PCI-1742U handleiding
Handleiding
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27 Chapter 3
3.4 Trigger Source Connections
3.4.1 Internal Pacer Trigger Connection
PCI-1742U includes one 82C54 compatible programmable Timer/
Counter chip which provides three 16-bit counters connected to a 10
MHz clock, each designated specifically as Counter 0, Counter 1 and
Counter 2. Counter 0 is a counter which counts events from an input
channel or outputting pulse. Counter 1 and Counter 2 are cascaded to cre-
ate a 32-bit timer for pacer triggering. A low-to-high edge from the
Counter 2 output (PACER_OUT) will trigger an A/D conversion on the
PCI-1742U. At the same time, you can also use this signal as a synchro-
nous signal for other applications.
3.4.2 External Trigger Source Connection
In addition to pacer triggering, the PCI-1742U also allows external trig-
gering for A/D conversions. A low-to-high edge coming from
EXT_TRG will trigger an A/D conversion on the PCI-1742U. When
DGND is connected to TRG_GATE, the external trigger function is
thereby disabled.
3.5 Field Wiring Considerations
When you use the PCI-1742U 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-1742U.
• 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.
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Productinformatie
| Merk | Advantech |
| Model | PCI-1742U |
| Categorie | Niet gecategoriseerd |
| Taal | Nederlands |
| Grootte | 5110 MB |
