Keithley 2461 Reference Manual page 273

Section 3: Functions and features Model 2461 Interactive SourceMeter® Instrument Reference Manual
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 SCPI :TRIGger:TIMer<n>:DELay or TSP
trigger.timer[N].delay command.
To configure the count, use the SCPI command :TRIGger:TIMer<n>:COUNt or the TSP command
trigger.timer[N].count.
If count is set to a number greater than 1, the timer automatically starts the next trigger timer delay
at the expiration of the previous delay.
Set count to zero (0) to cause the timer to generate trigger events indefinitely.
If you use the trigger timer with a trigger model, make sure the count value is the same or more than
any count values expected in the trigger model.
Timer delays
You can set up the timers to perform delays. A delay is the period after the timer is triggered and
before the timer generates a trigger event. All delay values are specified in seconds.
Delay lists, which are only available through TSP, allow the timer to sequence through an array of
delay values. Delay lists 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 in the list. The timer repeats the delay
list after all of the elements in the delay list have been used.
Using SCPI commands:
To set up a 50 µs trigger timer delay for timer 2, send the command:
TRIGger:TIMer2:DELay 50E-6
Using TSP commands to create a reading buffer:
To set up a 50 µs trigger timer delay for timer 2, send the command:
trigger.timer[2].delay = 50e-6
To set up a delay list for timer 3 for delays of 2, 10, 15, and 7 s, send the command:
trigger.timer[3].delaylist = {2, 10, 15, 7}
Define when to generate a timer event
You can specify when timer events are generated using the SCPI
:TRIGger:TIMer<n>:STARt:GENerate or TSP trigger.timer[N].start.generate
command.
When this is set to on, a trigger event is generated immediately when the timer is triggered.
When it is set to off, a trigger event is generated when the timer elapses.
You can also watch for a stimulus before starting the timer by using the SCPI
:TRIGger:TIMer<n>:STARt:STIMulus command or trigger.timer[N].start.stimulus
command.
You can also set an alarm or time in the future when the timer will start using the seconds and
fractional seconds commands. (SCPI commands :TRIGger:TIMer<n>:STARt:SEConds and
:TRIGger:TIMer<n>:STARt:FRACtional; TSP commands
trigger.timer[N].start.seconds and trigger.timer[N].start.fractionalseconds.)
3-102 2461-901-01 A/November 2015