Understanding Synchronous Triggering Modes - Keithley 2651A Reference Manual

Section 3: Functions and features
Output characteristics:
•
In addition to trigger events from other trigger objects, the digio.trigger[N].assert() and
tsplink.trigger[N].assert() commands generate a low pulse that is similar to the falling
edge trigger mode.
•
An action overrun occur if the physical line state is low while a stimulus event occurs.

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 (SynchronousM)
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
Instruments equivalent.
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Model 2651A High Power System SourceMeter® Instrument Reference Manual
Figure 58: Either edge output trigger
External Drive
Internal Drive
Physical Line State
Event
Stimulus Event
Action Overrun
Pulse Duration
Output Trigger
2651A-901-01 Rev. A / March 2011