Tektronix Keithley 2651A Reference Manual page 166

Section 3: Functions and features
Action overruns on hardware lines
An action overrun occurs when a trigger event is received before the digital I/O or TSP-Link
ready to process it. The generation of an action overrun is dependent upon the trigger mode selected
for that line. For more details on the causes of action overruns, see
3-65). Use the status model to monitor for the occurrence of action overruns. For details, see
model (on page 15-1).
Timers
A timer is a trigger object that performs a delay when triggered. You can use timers to create delays,
to start measurements, and step the source value at timed intervals. When a delay expires, the timer
generates a trigger event. The Model 2651A has eight independent timers.
Timer attributes
Each timer has attributes that you can configure. These attributes are described in the following
sections.
Count
The count sets the number of events to generate each time the timer generates a trigger event. Each
event is separated by the delay set by the trigger.timer[N].delay command.
To configure the count, use the trigger.timer[N].count command.
Set the count number to 0 (zero) to cause the timer to generate trigger events indefinitely.
Timer delays
You can configure timers to perform the same delay each time or set up a delay list that allows the
timer to sequence through an array of delay values. All delay values are specified in seconds.
A delay is the period after the timer is triggered and before the timer generates a trigger event. The
programming example below illustrates how to configure timer 3 for a 10 s delay:
trigger.timer[3].delay = 10
You can configure a custom delay list to allow the timer to use a different interval each time it
performs a delay. Each time the timer generates a trigger event, it uses the next delay value in the list.
The timer repeats the delay list after all the elements in the delay list have been used. The
programming example below illustrates how to configure timer 3 for delays of 2, 10, 15, and 7
seconds:
-- Configure timer 3 to complete delays of 2 s, 10 s,
-- 15 s, and 7 s.
trigger.timer[3].delaylist = {2, 10, 15, 7}
3-48
Model 2651A High Power System SourceMeter® Instrument Reference Manual
®
Hardware trigger modes
2651A-901-01 Rev. C October 2021
line is
(on page
Status