Reference Oscillator
The R&S SMC is equipped with an internal reference oscillator that generates a reference frequency of 10 MHz. It is used as internal reference source for the synthesizer and the local oscillator. Alternatively, you can apply an external reference signal.
Regardless of the used reference source (internal or external), the R&S SMC always provides the configured reference frequency at the output. You can use it, for example to synchronize several interconnected instruments.
![]() | The settings of the reference oscillator are not affected by an instrument preset ("PRESET" key). |
The following examples briefly explain the possible test setups and the settings to be considered.
- Internal fref = 10 MHz (10 MHz REF OUT)Synchronizing a subsequent instrument using the internal 10 MHz reference signal of the R&S SMC
The internal reference oscillator supplies the reference frequency.Settings:– "Source": "Internal" - External fref = 10 MHz (10 MHz REF OUT)
If you have a clean external reference signal with 10 MHz frequency, you can directly pass it to the output. The signal quality remains the same.Synchronizing instruments by means of an externally applied reference signal having 10 MHzSettings:– "Source": "External" – "External Reference Frequency": "10 MHz"
Set the additionally provided parameters, as for example the synchronization bandwidth according to the requirements of the application.
The appropriate connectors are located at the rear panel, see "REF IN" and "REF OUT".
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