Agilent Technologies 8935 Series Manual de usuario descargar pdf (Pagina 105)

Chapter 5 105

Triggering Measurements

The measurement cycle is started (triggered) by the occurrence of a

trigger event. The reliability and accuracy of the measurement result,

as well as the speed of the measurement cycle are influenced by the

trigger mode in effect at the time the trigger event occurs. Some modes

are faster than others; some modes provide settling for signals that may

contain transients. The best triggering mode to use will depend upon

the measurement requirements (repeatability, accuracy and speed).

Trigger Event

The Test Set starts a measurement cycle when a valid Trigger Event is

received. A Trigger Event is analogous to telling the Test Set to “start

the measurement now.” There are three commands that can be used to

issue a Trigger Event to the Test Set through HP-IB:

• A Group Execute Trigger Command (GET) as defined by IEEE

488.1-1987

• A Trigger Common Command (*TRG) as defined by IEEE

488.2-1987

• A :TRIGger:IMMediate Test Set command.

All three commands are equivalent and have the same effect when

received by the Test Set. The Test Set responds to the three commands

by triggering all currently active measurements. A measurement is

defined as active if

• it is on the currently displayed screen

• it is in the ON state

From a programming perspective this means that the screen which

contains the measurement of interest must be made available using the

DISPlay command and that the measurement STATe must be ON.

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Agilent Technologies 8935 Series Manual de usuario Pagina 105