Reference Oscillator
R&S
®
SMA100B
268User Manual 1178.3834.02 ─ 05
8 Reference Oscillator
The R&S SMA100B is equipped with an internal reference oscillator that generates a
reference frequency of 10 MHz. It is used as internal reference source for the synthe-
sizer. Alternatively, you can apply an external reference signal. If equipped with the
required options, the R&S SMA100B can process external reference frequency in the
range 1 MHz to 100 MHz and the 1 GHz reference frequency.
Regardless of the used reference source (internal or external), the R&S SMA100B
always outputs the reference frequency at the output connector. You can use it, for
example to synchronize further connected instruments.
See:
●
Data sheet, for a comprehensive description of the possible reference frequency
inputs and outputs, their characteristics and the required options
●
Chapter 8.2, "Using the Reference Frequency for Instruments Synchronization",
on page 268, for an overview of typical test situations
The reference oscillator settings are not affected by an instrument preset ([Preset] key
or *RST) and the "Save/Recall" function. They are reset only by factory preset.
The remote commands required to define these settings are described in Chap-
ter 13.16.12, "SOURce:ROSCillator Subsystem", on page 637.
8.1 Required Options
R&S SMA100B base unit equipped with the following options:
●
Reference frequencies 1 MHz to 100 MHz (R&S SMAB-K704)
●
Ultra low noise 1 GHz (R&S SMAB-K703)
For more information, see data sheet.
8.2 Using the Reference Frequency for Instruments Syn-
chronization
Test setups with two or more instruments often require that the instruments use a com-
mon reference frequency. Depending on the availability of external reference frequency
source and its quality, the instruments are connected and configured in different ways.
This section gives an overview of the possible test setups and the related settings. The
following situations are considered:
●
External reference source is not available or the built-in reference oscillator is of
better quality than the external source
(see "Distributing the internal 10 MHz reference signal to further instruments"
on page 269)
Using the Reference Frequency for Instruments Synchronization
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