Instrument Setup and Interface Configuration - SETUP Key R&S FSL
1300.2519.12 4.494 E-11
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Reference Int/Ext
Switches between the internal and external reference signal source. The default setting is
internal reference. It is important, that the external reference signal is deactivated when
switching from external to internal reference to avoid interactions.
If the reference signal is missing when switching to external reference, the message EXREF is
displayed to indicate that no synchronization is performed.
The R&S FSL can use the internal reference source or an external reference source as
frequency standard from which all internal oscillators are derived. A 10 MHz crystal oscillator is
used as internal reference source. In the external reference setting, all internal oscillators of the
R&S FSL are synchronized to the external reference frequency (also 10 MHz). For details on
connectors refer to the Quick Start Guide, chapter 1 "Front and Rear Panel".
Remote: ROSC:SOUR INT
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