Keithley 2750, User Manual

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Model 2750 Multimeter/Switch System User’s Manual Triggering 8-7
External trigger
The EXT TRIG input requires a falling-edge, TTL-compatible pulse with the specifica-
tions shown in
Figure 8-4 . In general, external triggers can be used to control measure
operations. For the Model 2750 to respond to external triggers, the trigger model must be
configured for it.
Figure 8-4
Trigger link input pulse specifications (EXT TRIG)
Voltmeter complete
The VMC output provides a TTL-compatible output pulse that can be used to trigger other
instruments. The specifications for this trigger pulse are shown in
Figure 8-5 . Typically,
you would want the Model 2750 to output a trigger after the settling time of each
measurement.
Figure 8-5
Trigger link output pulse specifications (VMC)
Triggers on
Leading Edge
TTL High
(2V-5V)
TTL Low
(
≤
0.8V)
2
μ
s
Minimum
Meter
Complete
TTL High
(3.4V Typical)
TTL Low
(0.25V Typical)
10
μ
s
Minimum
2750-900-01.book Page 7 Wednesday, August 3, 2011 7:56 AM