Rohde & Schwarz FSV3000, User Manual

Page: 738 / 1489

General instrument setup
R&S
®
FSVA3000/ R&S
®
FSV3000
738 User Manual 1178.8520.02 ─ 08
Table 10-2: Available Reference Frequency Input
Setting Source
Connector Frequency Loop Bandwidth Description
Internal (OCXO) 10 MHz 0.3 Hz Internal reference signal or optional OCXO
External Reference
1..100 MHz REF IN 1 10 MHz to 100 MHz
in 10
MHz steps
0.3 Hz to 100 Hz Variable external reference frequency
Good external phase noise suppression
External Reference
10..1280 MHz REF IN 2 10 MHz, 100 MHz,
128 MHz, 640 MHz,
1000 MHz, 1280 MHz
3 Hz to 3000 Hz Requires option R&S FSV3-K703
Variable external reference frequency
Good external phase noise suppression
Remote command:
[SENSe:]ROSCillator:SOURce
on page 1292
SOURce<si>:EXTernal<ext>:ROSCillator:EXTernal:FREQuency
on page 1291
Behavior in case of missing external reference ← Reference Frequency Input
If an external reference is selected but none is available, there are different ways the
instrument can react.
"Show Error
Flag" The error message "External reference missing" is displayed if no
valid external reference signal is available. Additionally, the flag "NO
REF" is displayed to indicate that no synchronization was performed
for the last measurement .
"Switch to
internal refer-
ence" The instrument automatically switches back to the internal reference
if no external reference is available. Note that you must re-activate
the external reference if it becomes available again at a later time.
Remote command:
[SENSe:]ROSCillator:EXTernal:FALLback
on page 1291
Frequency ← Reference Frequency Input
Defines the external reference frequency to be used (for variable connectors only).
Loop Bandwidth ← Reference Frequency Input
Defines the speed of internal synchronization with the reference frequency. The setting
requires a compromise between performance and increasing phase noise.
Remote command:
[SENSe:]ROSCillator:LBWidth
on page 1290
Reference Frequency Output
A reference frequency can be provided by the R&S FSV/A to other devices that are
connected to this instrument. If activated, the reference signal is output to the corre-
sponding connector.
"Output 640 MHz"
Provides a 640 MHz reference signal to the REF OUTPUT 640 MHz
connector.
Remote command:
[SENSe:]ROSCillator:O640
on page 1291
Reference frequency settings