Section 3: Functions and features Model 2657A High Power System SourceMeter® Instrument Reference Manual
3-60 2657A-901-01 Rev. B/December 2012
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.
Use the SynchronousM trigger mode to receive notification when the triggered action on all nodes is
complete.
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 is not detected until all external drives release the line and the line floats high.
Figure 57: SynchronousM input trigger
Output characteristics:
• In addition to trigger events from other trigger objects, the digio.trigger[N].assert() and
tsplink.trigger[N].assert() functions generate a low pulse that is similar to the falling
edge trigger mode.
• An action overrun occurs if the physical line state is low while a stimulus event occurs.
NOTE
External Drive
Internal Drive
Physical Line State
Event
Stimulus Event
Action Overrun
Input Trigger
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