SENSe:ROSCillator:SOURce
Syntax
[SENSe:]ROSCillator:SOURce {INTernal | EXTernal}
[SENSe:]ROSCillator:SOURce?
Description
This command selects the reference oscillator source.
l INTernal selects the internal 10 MHz oscillator
l EXTernal selects the Ext Ref In BNC. A valid 1, 5, or 10 MHz signal, as specified by SENSe:ROSCil-
lator:EXTernal:FREQuency, must be present, or error +2009, "No valid external timebase" will be gen-
erated when a measurement is started.
Remarks
l CONFigure and MEASure? do not affect the reference oscillator source.
l Selecting the reference oscillator source will disable automatic selection of the reference oscillator
(SENSe:ROSCillator:SOURce:AUTO set to OFF).
l When SENSe:ROSCillator:SOURce:AUTO ON is set, you can send the query form of this command to
determine whether the internal or an external reference oscillator is being used.
l The reference oscillator source is stored in non-volatile memory, and is unchanged after a Factory
Reset (*RST command) or an Instrument Preset (SYSTem:PRESet command).
l The reference oscillator source is set to INTernal with automatic selection of the reference oscillator
source enabled when the instrument is shipped from the factory or after a SYSTem:SECurity:IMMediate
command.
Return Format
The query returns the gate source: INT or EXT.
Examples
The following example makes a frequency measurement with an external reference oscillator:
ROSC:SOUR EXT
MEAS:FREQ? 1.2E6
Typical Response: +1.21513398300000E+006
See Also
SENSe:ROSCillator:EXTernal:FREQuency
SENSe:ROSCillator:SOURce
362 Keysight 53220A/53230A Programmer's Reference
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