Programming Triggering; More Information On Triggering; How Do I Generate A Service Request; Setting Up A Service Request - Keithley 2651A Reference Manual

High power system sourcemeter instrument

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Model 2651A High Power System SourceMeter® Instrument Reference Manual Section 9: Frequently asked questions (FAQs)

Programming triggering

The programming example below illustrates how to set up triggering. The example sets the output

pulse width on line 1, then programs both lines 1 and 2 for falling edge triggers. Digital I/O line 1

trigger asserts and then line 2 waits for the input trigger up to the timeout period specified.

-- Set line 1 pulse width to 10 us.

digio.trigger[1].pulsewidth = 10e-6

-- Set line 1 mode to falling edge.

digio.trigger[1].mode = digio.TRIG_FALLING

-- Set line 2 mode to falling edge.

digio.trigger[2].mode = digio.TRIG_FALLING

-- Assert trigger on line 1

digio.trigger[1].assert()

-- When complete Wait for trigger on line 2.

digio.trigger[2].wait(timeout)

For additional information, see

For detailed information on this topic, see the

The exact programming steps necessary to generate a GPIB service request (SRQ) will vary

somewhat depending on the event(s) intended to generate the SRQ. In general, the steps used will

be as follows:

1. Clear all status registers to prevent anomalous events from generating an SRQ.

2. Set bits in the appropriate operation: questionable, measurement enable, or transition register(s).

3. Set the proper summary bit in the service request enable register. At least one bit in this register

must always be set, but the exact bit(s) to be set will depend on the desired SRQ event(s).

2651A-901-01 Rev. A / March 2011

Figure 110: Triggering a scanner

(on page 3-32).

Status Model

(on page E-1) section of this manual.

= Trigger object

= External output trigger

= External input trigger