Keithley 2601B Reference Manual page 193

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 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.
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Series 2600B System SourceMeter® Instrument Reference Manual
Figure 72: Falling edge input trigger
Figure 73: Falling edge output trigger
2600BS-901-01 Rev. B / May 2013