Keithley 2651A Reference Manual page 170

Model 2651A High Power System SourceMeter® Instrument Reference Manual
Output characteristics:
•
In addition to trigger events from other trigger objects, the digio.trigger[N].assert() and
tsplink.trigger[N].assert() functions release the line if the line is latched low. The pulse
width is not used.
•
The physical line state does not change until all drives (internal and external) release the line.
•
Action overruns occur if the internal drive is not latched low and a source event is received.
Synchronous trigger mode
The synchronous trigger mode is a combination of SynchronousA and SynchronousM trigger modes.
Use the Synchronous trigger mode for compatibility with older Keithley Instruments products.
Keithley Instruments recommends using SynchronousA and SynchronousM modes only.
Input characteristics:
•
The falling edge generates an input event and latches the internal drive low.
2651A-901-01 Rev. A / March 2011
Figure 62: SynchronousA output trigger
External Drive
Internal Drive
Physical Line State
Event
Stimulus Event
Action Overrun
NOTE
Section 3: Functions and features
Output Trigger
3-63