Understanding Synchronous Triggering Modes - Keithley 2601 Reference Manual

Section 10: Digital I/O and Triggering

Understanding synchronous triggering modes

Use the synchronous triggering modes to implement bidirectional triggering, to wait for one node,
or to wait for a collection of nodes to complete all triggered actions.
All non-Keithley instrumentation must have a trigger mode that functions similar to the
SynchronousA or SynchronousM trigger modes.
To use synchronous triggering, configure the triggering master to SynchronousM trigger mode or
the non-Keithley equivalent. Configure all other nodes in the test system to SynchronousA trigger
mode or a non-Keithley equivalent.
Synchronous master trigger mode
Use the Synchronous master trigger mode (SynchronousM) to generate falling edge output
triggers, to detect the rising edge input triggers, and to initiate an action on one or more external
nodes with the same trigger line.
In this mode, the output trigger consists of a low pulse. All non-Keithley instruments attached to the
synchronization line in a trigger mode equivalent to SynchronousA must latch the line low during
the pulse duration.
To use the SynchronousM trigger mode, configure the triggering master as SynchronousM and
then configure all other nodes in the test system as Synchronous, SynchronousA, or to the
non-Keithley equivalent.
NOTE Use the SynchronousM trigger mode to receive notification when the
Figure 10-13: SynchronousM input trigger
Input characteristics:
• All rising edges are input triggers
• When all external drives release the physical line, the rising edge is detected as an input
trigger
• A rising edge cannot be detected until all external drives release the line and the line floats
high
10-20
triggered action on all nodes is complete.
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Series 2600 System SourceMeter® Instruments Reference Manual
2600S-901-01 Rev. C / January 2008