Rohde & Schwarz FSW43 - Page 569

General Instrument Setup
R&S
®
FSW
569User Manual 1173.9411.02 ─ 19
└ Frequency.....................................................................................................570
└ Loop Bandwidth............................................................................................ 570
Reference Frequency Output......................................................................................570
Resetting the Default Values.......................................................................................571
Reference Frequency Input
The R&S FSW can use the internal reference source or an external reference source
as the frequency standard for all internal oscillators. A 10 MHz crystal oscillator is used
as the internal reference source. In the external reference setting, all internal oscillators
of the R&S FSW are synchronized to the external reference frequency.
External references are connected to one of the REF INPUT or the SYNC TRIGGER
connectors on the rear panel. For details see the "Getting Started" manual.
Note: Optionally (R&S FSW-B4), the more precise OCXO signal can replace the inter-
nal reference source.
The default setting is the internal reference. When an external reference is used, "EXT
REF" is displayed in the status bar.
The following reference inputs are available:
Table 9-1: Available Reference Frequency Input
Source Frequency Tuning
Range
Loop Band-
width
Description
Internal 10 MHz - 1-100 Hz Internal reference signal
or OCXO (option R&S FSW-B4)
External Reference
10 MHz
10 MHz +/- 6 ppm 1-100 Hz External reference from REF INPUT
1..20 MHZ connector;
Fixed external 10 MHZ reference fre-
quency.
Good phase noise performance
External Reference
1..20 MHz
1..20 MHz
in 1 Hz
steps
+/- 0.5 ppm 0.1 Hz (fixed) Variable external reference frequency
in 0.1 Hz steps from REF INPUT
1..20 MHZ connector;
Good external phase noise suppres-
sion. Small tuning range.
+/- 6 ppm 1-30 Hz Variable external reference frequency
in 0.1 Hz steps from REF INPUT
1..20 MHZ connector;
Wide tuning range.
External Reference
100 MHz
100 MHz +/- 6 ppm 1-300 Hz External reference from REF INPUT
100 MHZ connector
Good phase noise performance
Sync Trigger 100 MHz +/- 6 ppm 1-300 Hz External reference from SYNC
TRIGGER INPUT connector
Remote command:
[SENSe:]ROSCillator:SOURce on page 1020
SOURce:EXTernal:ROSCillator:EXTernal:FREQuency on page 1019
General Instrument Settings