R&S ESCI Configuration/Setup
1166.6004.12 4.205 E-3
External Reference Oscillator
The R&S ESCI 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 default setting (internal reference), this frequency is available as output signal
at rear-panel connector REF OUT, eg to synchronize other instruments to the reference of the R&S
ESCI.
In the setting REFERENCE EXT, the connector REF IN is used as input connector for an external
frequency standard. In this case all internal oscillators of the R&S ESCI are synchronized to the external
reference frequency (also 10 MHz).
SETUP menu:
REFERENCE
INT EXT
The REFERENCE INT / EXT softkey switches between the internal and
external reference.
Note: If the reference signal is missing when switching to external
reference, the message "EXREF" appears after a while to
indicate that there is no synchronization.
On switching to internal reference please ensure that the
external reference signal is de-activated to avoid interactions
with the internal reference signal.
IEC/IEEE-bus command: ROSC:SOUR INT
External Noise Source
SETUP menu:
NOISE SRC
ON OFF
The NOISE SRC ON/OFF softkey switches on or off the supply voltage for an
external noise source which is connected to the NOISE SOURCE connector
on the rear panel of the instrument.
IEC/IEEE-bus command: DIAG:SERV:NSO ON
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