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Section 7: Triggering
Model 6517B Electrometer Reference Manual
Semi-synchronous operation
In the Semi-synchronous trigger link mode, all triggering (input and output) is controlled by a single
line. When the normally high (+5 V) trigger line is pulled low (0 V), a trigger occurs on the negative-
going edge. When the trigger line is released, a trigger occurs on the positive-going edge. See the
following figure for an example. The advantage of this single line trigger is that as long as one of the
instruments in the system holds the line low, the trigger is suppressed. In other words, the trigger
does not occur until all instruments in the system are ready.
Figure 85: Semi-synchronous trigger link specifications
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6517B-901-01 Rev. C / August 2015
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