6 Input/Output
6.6 Freq Ref Input
6.6 Freq Ref Input
Lets you configure the External Frequency Reference input on the rear panel.
6.6.1 Freq Ref Input
Specifies the frequency reference as being the internal reference, an external
reference at the rear panel input labeled EXT REF IN, a 1 pulse per second signal at
the EXT REF IN input, or automatically sensing the appropriate reference.
See "More Information" on page 2450
Remote Command
[:SENSe]:ROSCillator:SOURce:TYPE INTernal | EXTernal | SENSe | PULSe
[:SENSe]:ROSCillator:SOURce:TYPE?
Example
:ROSC:SOUR:TYPE SENS
:ROSC:SOUR:TYPE INT
:ROSC:SOUR:TYPE EXT
:ROSC:SOUR:TYPE PULS
Dependencies The PULSe parameter, and support of the 1 pps signal at the EXT REF IN input, are not available in
some models. If not available, the choice does not appear, and sending the PULSe parameter via SCPI
generates an error
For VXT models M9420A/10A/11A/15A and M9410E/11E/15E/16E the only available selection is
EXTernal, unless M9420A/10A/11A/15A is configured in MIMO mode as Primary module. If
configured in MIMO mode as Primary module, the available selection is INTernal | EXTernal
| SENSe
For EXM the only available selections are INTernal | EXTernal | SENSe
For E7760B and M8920A/20B the only available selections are INTernal | EXTernal
Not available in UXM
Preset Unaffected by Preset, but set to EXTernal in VXT models M9420A/10A/11A/15A, INTernal for
E7760B, and SENSe for other models, by Restore Input/Output Defaults or Restore System Defaults-
>All
State Saved Saved in instrument state
Annunciation In the Meas Bar:
If you set this to Internal and no external reference is plugged in:
Freq Ref: Internal
If you set this to Internal and an external reference between 1 and 50 MHz, or a 1 pps signal, IS
plugged in:
Freq Ref: Internal (in amber, as a warning sign)
If you set this to External and an External Reference between 1 and 50 MHz is plugged in:
Freq Ref: External
2448 Spectrum Analyzer Mode User's &Programmer's Reference
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