Preparing for Operation
Instrument Preparation
2
2-13
Complete the following procedure to make a connection to the
ALARM/TRIGGER I/O connector:
1. Remove the ALARM/TRIGGER I/O connector from the rear panel.
2. Loosen the wire clamp screw for the associated terminal.
3. Feed the wire into the gap between the connector body and the wire clamp.
4. Tighten the wire clamp; do not overtighten and crush the wire.
5. Repeat steps 2 through 4 for each wire.
6. Insert the connector in the rear panel.
Trigger Input 2-16.
Trigger Input uses terminals TI and GND. A contact closure or a TTL low signal
input between TI and GND triggers instrument scanning when you select External
Trigger as a scan parameter. (See "Scan Parameters" in Chapter 3) A TTL signal
input triggers on the falling edge of the signal. A contact closure input triggers on
the "close" portion of the switch sequence, open-close-open. Scanning continues
at the Interval 2 rate while TI is held low. See Table A-4 in Appendix A for
specifications.
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