RF Reference Frequency - Reference Oscillator R&S SMB
1407.0806.32 4.30 E-2
RF Reference Frequency - Reference Oscillator
In the internal reference mode the internal reference signal is available at the REF OUT connector (rear
of instrument). The frequency of the internal reference signal is fixed to 10 MHz.
External impairment is possible in both Adjustment State states (On or Off).
For EFC (Electronic Frequency Control), e.g. in phase noise measurement systems external FM
modulation (DC coupling) in low noise mode is used. FM-DC mode yields a fixed tuning sensitivity
which is independent from the set RF output frequency. The tuning sensitivity is equal to the set FM
deviation.
In the external reference mode an external signal with selectable frequency and defined level must be
input at the REF IN connector . This signal is output at the REF OUT connector. The EXT REF status
message appears in the display header.
Reference Oscillator Menu
The Reference Oscillator menu is opened in the RF function block or using the MENU key under RF.
The menu is used to select the source, to enter the frequency of an external reference signal and to
adjust the reference frequency. This mode corresponds to EFC mode (Electronic Frequency Control).
Source - Reference
Oscillator
Selects the source of the reference frequency.
Internal
The internal reference signal of 10 MHz is used.
Remote-control command:
SOUR:ROSC:SOUR INT
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