Agilent Technologies 8935 Series Manual do Utilizador descarregar pdf (Página 106)

106 Chapter 5

O:\Manuals\E6380A_Progguid\Book\Trigmeas.fm

Triggering Measurements

Trigger Modes

The Trigger Mode is defined by two parameters: retriggering and

settling.

Retriggering

Retriggering refers to what a measurement does once it has completed

a measurement cycle. There are two options:

1. Single retriggering causes the measurement cycle to stop once a

valid measurement result has been obtained. A valid trigger

command must be received to start the measurement again. When a

measurement cycle is completed, the values for all active

measurements are held until another trigger command is received.

This allows the control program to query a group of measurements

that were triggered at the same time. This is the same functionality

as the front-panel HOLD function.

When the trigger mode is set to single retriggering, consecutive

queries of the same measurement (with no intervening trigger

event) will return the same value. Measurements that rely on

external signals or hardware-generated events (such as the DTMF

Decoder) must be re-armed with a new trigger command before

another measurement can be made.

2. Repetitive retriggering causes the measurement cycle to

immediately start over once a valid measurement result has been

obtained. No trigger event must be received to start the

measurement again. Repetitive retriggering will cause

measurements that rely on external signals or hardware generated

events (such as the DTMF Decoder) to be

re-armed upon completion of a measurement cycle (a valid

measurement result has been obtained). When the trigger mode is

set to repetitive retriggering, consecutive queries of the same

measurement return new measured values.

NOTE

If a measurement cycle does not successfully obtain a valid

measurement result, it will continue to try until it does or the

measurement trigger is aborted. This is true for both retriggering

modes.

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Agilent Technologies 8935 Series Manual do Utilizador Página 106