R&S FSPN - Page 482

Remote Control
R&S
®
FSPN
482User Manual 1179.4363.02 ─ 01
[SENSe:]ROSCillator:TRANge <Range>
Defines the tuning range. The tuning range is only available for the variable external
reference frequency. It determines how far the frequency may deviate from the defined
level in parts per million (10
-6
).
Parameters:
<Range> WIDE | SMALl
The possible values depend on the reference source (see
Table 9-1).
SMALl
With this smaller deviation (+/- 0.5 ppm) a very narrow fixed loop
bandwidth of 0.1 Hz is realized. With this setting the instrument
can synchronize to an external reference signal with a very pre-
cise frequency. Due to the very narrow loop bandwidth, unwan-
ted noise or spurious components on the external reference
input signal are strongly attenuated. Furthermore, the loop
requires about 30 seconds to reach a locked state. During this
locking process, "NO REF" is displayed in the status bar.
WIDE
The larger deviation (+/- 6 ppm) allows the instrument to syn-
chronize to less precise external reference input signals.
Example:
ROSC:TRAN WIDE
Manual operation: See "Tuning Range" on page 229
[SENSe:]ROSCillator:EXTernal:FALLback <State>
Defines how the instrument reacts if an external reference is selected but none is avail-
able.
Parameters:
<State> ON | OFF | 0 | 1
OFF | 0
If no valid external reference signal is available, the error mes-
sage "External reference missing" is displayed. Additionally, the
flag "NO REF" is displayed to indicate that no synchronization
was performed for the last measurement.
ON | 1
If no external reference is available, the instrument automatically
switches back to the internal reference. Note that you must re-
activate the external reference if it becomes available again at a
later time.
*RST:
0
Manual operation: See "Behavior in case of missing external reference"
on page 229
Configuring the R&S FSPN