Trigger Link Operation - Keithley 7002-HD User Manual

Model 7002-HD User's Manual
Figure 4-5
Trigger Link output pulse specifications
(3.4V Typical)
TTL Low
(0.25V Typical)
Figure 4-6
Trigger Link input pulse specifications
TTL High
(2V-5V)
TTL Low
(£0.8V)

Trigger Link operation

In general, Trigger Link input triggers to the Model 7002-HD are used to control
scan operation. In order for the Model 7002-HD to respond to Trigger Link compat-
ible triggers, the appropriate layers of the scan must be properly programmed. For
example, if you want Trigger Link input triggers to control the channel scan pro-
cess, you must program Channel Spacing for TRIGLINK trigger events. Typically,
a Trigger Link output trigger from the Model 7002-HD would be used to trigger
another instrument to measure the currently selected channel.
There are two modes of operation for Trigger Link: asynchronous and
semi-synchronous. In the asynchronous mode, separate lines are used for input
and output triggers, and in semi-synchronous mode, the same line is used for both
input and output triggers.
Channel
Ready
TTL High
10ms
Minimum
Triggers on
Leading Edge
2ms
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Section 4 topics
Front Panel Operation 4-27