Reference Oscillator
R&S
®
SMA100B
181
User Manual 1178.3834.02 ─ 03
Variable Reference Frequency
Requires R&S
SMAB-K704
Sets the variably settable external reference frequency.
Remote command:
[:SOURce]:ROSCillator:EXTernal:FREQuency:VARiable
Synchronization Bandwidth
Selects the synchronization bandwidth for an external reference signal.
The resulting bandwidth is indicated with the parameter
.
"Narrow"
The internal reference oscillator is synchronized to the external signal
with small bandwidth (< 1 Hz). This setting is recommended if the
phase noise of the external signal is worse than the phase noise of
the internal OCXO.
"Wide"
This mode is the recommended standard mode and for precise refer-
ence sources of high spectral purity.
Note:
If the frequency of the external reference signal is outside the
locking range of the internal reference oscillator, spurs due to the dif-
ference of the internal and external reference frequency are gener-
ated in the reference PLL.
An error message is displayed.
For more information, see data sheet.
Remote command:
[:SOURce]:ROSCillator:EXTernal:SBANdwidth
Nominal Synchronization Bandwidth
Indicates the nominal synchronization bandwidth for the selected external reference
frequency and synchronization bandwidth.
Minimum Locking Range
Indicates the minimum locking range, depending on the selected external reference
frequency and synchronization bandwidth.
External Tuning Active
For "Source > Internal", activates the EFC (external frequency control).
EFC is a function that transforms an external tuning voltage into frequency shift, where
the value range of the resulting frequency is a technical characteristic listed in the data
sheet.
See the data sheet also for information on the sensitivity, input voltage range, impe-
dance and maximum bandwidth for external tuning signal.
Remote command:
[:SOURce]:ROSCillator:INTernal:TUNing[:STATe]
External Tuning Slope
Sets the sensitivity of the external tuning volatge.
Reference Frequency Settings
