Agilent Technologies 53230A Guía de usuario descargar pdf (Pagina 67)

53220A/53230A User’s Guide 67

53220A/53230A Measurements 3

[SENSe:]ROSCillator:SOURce:AUTO {OFF|ON}

[SENSe:]ROSCillator:SOURce:AUTO? (query form)

- INTernal selects the counter’s internal 10 MHz oscillator. The signal is a

0.5 Vrms (into 50

Ω) sine wave. The internal oscillator signal is also present on

the counter’s rear panel Int Ref Out connector.

- EXTernal selects an external reference signal applied to the rear panel

Ext Ref In connector. The signal must be:

• 1 MHz , 5 MHz, or 10 MHz

• 100 mVrms to 2.5 Vrms

• sine wave

and the frequency must be specified by the SENSe:ROSCillator:EXTer-

nal:FREQuency command.

- :AUTO ON enables automatic selection of the reference oscillator source. If a

1, 5, or 10 MHz signal is present on the counter’s Ext Ref In connector, source

EXTernal is set. If a valid signal is not present or is lost, the source automat-

ically switches to INTernal.

Note that specifying an oscillator source (INTernal or EXTernal) using

[SENSe:]ROSCillator:SOURce disables automatic selection.

- :AUTO Off disables automatic selection of the oscillator source. The source

is then set by the [SENSe:]ROSCillator:SOURce command.

The reference oscillator source is set to INTernal with automatic selection

enabled (On) when the counter is shipped from the factory or following the

SYSTem:SECure:IMMediate command. Settings are stored in non-volatile

memory and are not changed after a reset (*RST) or instrument preset

(SYSTem:PREset or Preset key).

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Agilent Technologies 53230A Guía de usuario Pagina 67