2680A/2686A
Users Manual
2-10
Master Alarm
Master Alarm uses terminals Master Alarm and GND. It is a TTL signal that goes
to a logic low when any channel is in alarm while the instrument is scanning. This
TTL signal output can interface with external equipment such as warning lights,
alarms, paging systems, etc. See Table A-5 in Appendix A for complete
specifications.
External Trigger Wiring for a Group
External Trigger Wiring for a group instrument refers to the triggering
configuration in which you connect the Trigger Out line on the master instrument
to the Trigger In line on each other instrument in the group and provide a common
connection to the GND line for each instrument. This configuration provides
improved synchronization of the group of instruments when the scanning intervals
are 1 second or less.
Figure 2-4 shows a typical wiring connection for a group of instruments. Use the
Fluke DAQ software to configure the group of instruments as described in Chapter
3 of this manual.
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