R&S FSPN - Page 228

General Instrument Setup
R&S
®
FSPN
228User Manual 1179.4363.02 ─ 01
Reference Frequency Input.........................................................................................228
└ Behavior in case of missing external reference............................................ 229
└ Tuning Range............................................................................................... 229
└ Frequency.....................................................................................................229
└ Loop Bandwidth............................................................................................ 229
Reference Frequency Output......................................................................................229
Resetting the Default Values.......................................................................................230
Reference Frequency Input
The R&S FSPN 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 FSPN 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.
Note: The optional, and more precise OCXO signal can replace the internal reference
source.
The default setting is the internal reference. When an external reference is used, EXT
REF is displayed in the status bar.
Table 9-1: Available Reference Frequency Input
Setting Source Connector Frequency Tuning
Range
Loop Band-
width
Description
Internal (OCXO) 10 MHz - 1-100 Hz Internal reference signal
or optional OCXO
External Reference
10 MHz
REF INPUT
1..50 MHz
10 MHz +/- 6 ppm 1-100 Hz Fixed external 10 MHZ reference fre-
quency
Good phase noise performance
External Reference
1..50MHz
REF INPUT
1..50 MHz
1..50 MHz
in 1 Hz
steps
+/- 0.5 ppm 0.1 Hz (fixed) Variable external reference frequency
in 1 Hz steps
Good external phase noise suppres-
sion. Small tuning range.
+/- 6 ppm 1-30 Hz Variable external reference frequency
in 1 Hz steps
Wide tuning range.
External Reference
100 MHz
REF INPUT
100 MHz / 1 GHz
100 MHz +/- 6 ppm 1-300 Hz External reference
Good phase noise performance
External Reference
1 GHz
REF INPUT
100 MHz / 1 GHz
1 GHz +/- 6 ppm 1-300 Hz External reference
Sync Trigger SYNC TRIGGER
INPUT
100 MHz +/- 6 ppm 1-300 Hz External reference
Remote command:
[SENSe:]ROSCillator:SOURce on page 481
SOURce<si>:EXTernal<ext>:ROSCillator:EXTernal:FREQuency
on page 480
Reference Frequency Settings