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MEASure Commands SCPI Commands Reference

Agilent 81133A/81134A Pulse Generator Programming Guide, March 2007 37

:MEASure:FREQuency?

Syntax

:MEAS:FREQ?

Form Query

Description This command is used to measure the operating frequency of the

instrument.

In internal mode (

:TRIGger:SOURce IMMediate

) the frequency

returned is the measured internal clock frequency (not the

programmed value).

In external mode (

:TRIGger:SOURce EXTernal

) the frequency returned

is that measured at the Clock Input connector. If an invalid signal,

or no signal, is present at the Clock Input connector, a value of

zero is returned.

The query does not return a value immediately, but waits for the

internal frequency counter to complete its next measurement cycle.

This can take about half a second.

NOTE The instrument is stopped when this command is executed. Thus,

during the measurement, no signals will be output.

NOTE When working in an automated test system, if the clock frequency

is known, it is better to set it directly instead of reading it from

the instrument. This is because:

• This method is faster since it eliminates the measurement time.

• The instrument is not stopped.

Parameter –

*RST value –

Example

:MEAS:FREQ?

1 2 ... 32 33 34 35 36 37 38 39 40 41 42 ... 103 104

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Agilent Technologies 81134A Manuel de service Page 37