7-12 Triggering Model 6485 Picoammeter Instruction Manual
Input trigger requirements
An input trigger is used to satisfy event detection for a trigger model layer that is using the
TLINK control source. The input requires a falling-edge, TTL compatible pulse with the
specifications shown in Figure 7-5.
Figure 7-5
Trigger link input pulse specifications
Output trigger specifications
Model 6485 can be programmed to output a trigger immediately after a measurement and/
or when operation leaves the trigger layer of the trigger model. The output trigger provides
a TTL-compatible output pulse that can be used to trigger other instruments. The specifi-
cations for this trigger pulse are shown in Figure 7-6. A trigger link line can source 1mA
and sink up to 50mA.
Figure 7-6
Trigger link output pulse specifications
Triggers on
Leading Edge
TTL High
(2V-5V)
TTL Low
(
<0.8V)
2 µs
Minimum
Meter
Complete
TTL High
(3.4V Typical)
TTL Low
(0.25V Typical)
5µs
Minimum
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