Timers - Keithley 2651A Reference Manual

Model 2651A High Power System SourceMeter® Instrument Reference Manual
DIGITAL
I/O
(line 2)
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
3-56).

Timers

A timer is a trigger object that performs a delay when triggered. Timers can be used to create delays
and 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 8 independent timers.
Timer attributes
Each timer has four attributes that can be configured.
Count
Configures the number of events to generate each time the timer is triggered. Each event is
separated by a delay.
To configure the count, use the following attribute: trigger.timer[N].count
Set the count number to 0 (zero) to cause the timer to generate trigger events indefinitely.
2651A-901-01 Rev. A / March 2011
Figure 47: External instrument triggering
SMU A
Trigger event:
digio.trigger[2].EVENT_ID
Hardware triggers
Stimulus input:
smua.trigger.source.stimulus
Trigger event:
smua.trigger.SWEEP_COMPLETE_EVENT_ID
DIGITAL
I/O
(line 4)
Section 3: Functions and features
Legend:
= Trigger object
= Trigger events
= External output trigger
= Stimulus input
= External input trigger
Stimulus input:
digio.trigger[4].stimulus
Hardware trigger modes
®
line is
(on page
3-43