R&S SMA100B - Using the Reference Frequency for Instruments Synchronization

Reference oscillator
R&S
®
SMA100B
300User Manual 1178.3834.02 ─ 09
Adjustment Value
Sets a user-defined adjustment value for the internal reference frequency. This value
takes effect when it is activated with Adjustment Active.
●
"0" represents the calibrated state.
●
The setting range depends on the reference oscillator type and its factory calibra-
tion value.
Note:
The setting is not affected by an instrument preset ([Preset] key or *RST) and the
"Save/Recall" function. It is reset only by factory preset.
Remote command:
[:SOURce]:ROSCillator[:INTernal]:ADJust:VALue on page 696
9.5 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 300)
●
Clean external reference source with quality exceeding the quality of the built-in
reference oscillator
(see "Using external reference source" on page 302)
●
Interfered or noisy external reference signal
(see "Deriving 10 MHz from the external reference frequency" on page 302)
●
1 GHz reference coupling for phase coherence of the RF signals with enhanced
long-term phase stability
(see "Sharing the 1 GHz reference frequency to obtain phase-coherent signals"
on page 301)
Connectors overview
Use the "Show Connector" function to indicate the connector on the front/real panel:
●
"Ref In/Ref Out" on page 45
●
1GHz "Ref In/Ref Out" on page 45
●
"EFC" on page 45
Distributing the internal 10 MHz reference signal to further instruments
The internal reference oscillator provides the reference frequency:
●
Internal f
ref
= 10 MHz (10 MHz at connector Ref Out)
Using the reference frequency for instruments synchronization