Instrument Tour
R&S
®
ESW
56
User Manual 1177.6298.02 ─ 08
5.2.11
OCXO (Optional)
This optional OCXO generates a 10
MHz reference signal with a very precise fre-
quency. If installed, and if no external signal is used, this signal is used as an internal
reference. It can also be used to synchronize other connected devices via the REF
OUTPUT 10 MHz connector.
Warm-up time for OCXO
When the instrument is switched on, the OCXO requires an extended warm-up time
(see data sheet).
5.2.12
REF INPUT / REF OUTPUT
The REF INPUT connectors are used to provide an external reference signal to the
R&S
ESW.
The REF OUTPUT connectors can be used to provide an external reference signal (or
the optional OCXO reference signal) from the R&S
ESW to other devices that are con-
nected to this instrument.
Various connectors are provided for different reference signals:
Connector
Reference signal
Usage
REF INPUT
1...20 MHz
0...10 dBm
To provide an external reference signal on the
R&S
ESW.
REF OUTPUT
1...20 MHz
0...10 dBm
To provide the same external reference signal received
by the REF INPUT 1...20 MHz connector to another
device, when available.
REF OUTPUT
10 MHz
10 dBm
To provide the internal reference signal from the
R&S
ESW to another device continuously.
Also used to provide OCXO reference signal to another
device.
REF INPUT
100 MHz
0...10 dBm
To provide an external reference signal on the
R&S
ESW.
REF OUTPUT
100 MHz
6 dBm
To provide a 100 MHz reference signal from the
R&S
ESW to another device.
REF OUTPUT
640 MHz
16 dBm
To provide a 640 MHz reference signal from the
R&S
ESW to another device.
SYNC TRIGGER
The SYNC TRIGGER connector can also be used to synchronize the reference fre-
quency on several devices.
The Rear Panel
