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72 Chapter 5

Starting a Measurement (Trigger) and Detecting the Completion of a Measurement

(End of Sweeps)

Triggering a Measurement (Starting a Measurement)

Trigger system

The trigger system of the Agilent 4294A has three states: “Idle,” “Waiting for Trigger,” and

“Measurement” as shown in

Figure 5-1.

Figure 5-1 Trigger system

The state transitions in the trigger system are described below.

Executing the following command causes a transition to the “Idle” state.

• “HOLD” on page 318

Setting the number of sweeps with the following commands causes a transition to the

“Waiting for Trigger” state.

Generating a trigger in the “Waiting for Trigger” state causes a transition to the

“Measurement” state and initiates a measurement (one or more sweeps). The method used

to generate a trigger varies with the trigger source setting. To set the trigger source, use the

following command.

• “TRGS” on page 459

Command Number of measurements

“SING” on page 437 Once

“NUMG” on page 364 Specified number of times

“CONT” on page 282 Continuous (until “HOLD”, “SING”, or “NUMG” is executed)

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