Keysight PXA X Series User Manual

4 Input/Output Functions
Input/Output
External Reference Lock BW
This control lets you adjust the External Reference phase lock bandwidth. This control is available in some
models of the X-Series.
The PXA variable reference loop bandwidth allows an external reference to be used and have the analyzer
close-in phase noise improved to match that of the reference. This could result in an improvement of tens
of decibels. The choice of “Wide” or “Narrow” affects the phase noise at low offset frequencies, especially
4 to 400 Hz offset. When using an external reference with superior phase noise, we recommend setting the
external reference phase-locked-loop bandwidth to wide (60 Hz), to take advantage of that superior
performance. When using an external reference with inferior phase noise performance, we recommend
setting that bandwidth to narrow (15 Hz). In these relationships, inferior and superior phase noise are with
respect to −134 dBc/Hz at 30 Hz offset from a 10 MHz reference. Because most reference sources have
phase noise behavior that falls off at a rate of 30 dB/decade, this is usually equivalent to −120 dBc/Hz at
10 Hz offset.
Key Path
Input/Output, Freq Ref In
Scope Mode Global
Remote Command
[:SENSe]:ROSCillator:BANDwidth WIDE|NARRow
[:SENSe]:ROSCillator:BANDwidth?
Example ROSC:BAND WIDE
Dependencies Still available with Internal or Pulse selected, to allow setup for when External is in use. However,
the setting has no effect if the Internal Reference is in use (Freq Ref In set to Internal, Pulse, or
SENSE:INT or SENSE:PULSE).
This key only appears in analyzers equipped with the required hardware.
Preset This is unaffected by a Preset but is set to Narrow on a "Restore Input/Output Defaults" or "Restore
System Defaults -> All"
State Saved Saved in Input/Output state.
Initial S/W Revision A.04.00
Modified at S/W Revision A.14.00
Output Config
Accesses keys that configure various output settings, like the frequency reference output, trigger output
and analog output.
Key Path
Input/Output
Backwards Compatibility
Notes
In ESA there was not a user interface to enable the Video Output (Analog Output), Trigger Output, or
Gate Output. In the X-Series each of these physical connectors requires configuration, thus the
user interface has been added for X-Series, along with the potential for an output you think is
always on to be switched off.
Initial S/W Revision Prior to A.02.00
EMI Receiver Mode Reference 199

Keysight PXA X Series Specifications

General

Brand	Keysight
Model	PXA X Series
Category	Measuring Instruments
Language	English