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Models 2500 and 2502 User’s Manual Triggering 10-17

Remote triggering

Trigger model (remote operation)

The trigger model ﬂowchart in Figure 10-9 summarizes remote trigger operation. Opera-

tion is controlled by SCPI commands from the Trigger Subsystem. Key remote commands

are included in the trigger model. Also note that the GPIB defaults are denoted by the “✛”

symbol.

The primary actions of the trigger model are Source, Delay, and Measure. The source

action outputs the programmed voltage or current value, and the programmed delay pro-

vides a settling period for the source before the measurement is performed.

The trigger model consists of two layers (Arm Layer and Trigger Layer) to provide versa-

tility. Programmable counters allow operations to be repeated, and various input and out-

put trigger options are available to provide source-measure synchronization between the

Model 2500 and other instruments (via the Trigger Link).

Idle and initiate

The instrument is considered to be in the idle state (ARM annunciator off) when it is not

operating within the trigger model layers. While in the idle state, the instrument cannot

perform any measurements. An initiate command is required to take the instrument out of

idle. The following commands perform an initiate operation:

• :INITiate

• :READ?

• :MEASure?

Conversely, if the unit is taking readings, most commands (except DCL, SDC, IFC, and

ABORt) are queued up and will not be executed until the unit returns to idle.

The :MEASure? command will automatically turn the output on. Note that after the instru-

ment returns to the idle state, the output will remain on.

When auto output-off is enabled (:SOURce[1]1:CLEar:AUTO ON or

:SOURce2:CLEar:AUTO ON), any of the above three commands can be used to initiate

operation. The source output will automatically turn on at the beginning of each SDM

(source-delay-measure) cycle and turn off after each measurement is completed.

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Keithley 2500 User Manual

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