Keithley 2651A Reference Manual page 164

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() commands generate a low pulse for the programmed pulse
duration.
•
An action overrun occurs if the physical line state is low and a source event occurs.
Rising edge master trigger mode
Use the rising edge master (RisingM) trigger mode (see the figure titled "RisingM output trigger") to
synchronize with non-Keithley instruments that require a high pulse. Input trigger detection is not
available in this trigger mode. You can use the RisingM trigger mode to generate rising edge pulses.
The RisingM trigger mode does not function properly if the line is driven low by an external drive.
2651A-901-01 Rev. A / March 2011
Figure 52: Falling edge input trigger
External Drive
Internal Drive
Physical Line State
Event
Stimulus Event
Action Overrun
Figure 53: Falling edge output trigger
External Drive
Internal Drive
Physical Line State
Event
Stimulus Event
Action Overrun
NOTE
Section 3: Functions and features
Input Trigger
Pulse Duration
Output Trigger
3-57