Keysight x-series Instruction Manual

6 Input/Output
6.6 Freq Ref Input
If you set this to External and no External Reference is sensed:
Freq Ref: External (in amber, as a warning sign)
When set to Pulse and a 1 pps signal is plugged in:
Freq Ref: Pulse
If you set this to Pulse and no Pulse Reference is sensed:
Freq Ref: Pulse (in amber, as a warning sign)
When set to Sense and neither a signal between 1 and 50 MHz nor a 1 pps signal is detected at the
EXT REF IN input, "Sense:Int" is displayed:
Freq Ref: Sense,Int
When set to Sense and a signal within 5 ppm of the External Ref Freq (as set on the Ext Ref Freq
control) is detected at the EXT REF IN input:
Freq Ref: Sense,Ext
When set to Sense and a 1 pps signal is detected at the EXT REF IN input, "Sense:Pulse" is displayed:
Freq Ref: Sense,Pls
Status Bits/OPC
dependencies
STATus:QUEStionable:FREQuency bit 1 set if unlocked
Note: In EXM, the status bit is not set for non-controlling instances. To determine if the frequency
reference is unlocked, the controlling instance must be queried
Backwards
Compatibility
Notes
Freq Ref In was not saved in state in the legacy instruments. It is part of state in the X-Series
Remote Query
Remote
Command
[:SENSe]:ROSCillator:SOURce?
Notes Returns the current switch setting. This means:
1.
If it was set to SENSe but there is no external reference nor 1pps signal, so the instrument is
actually using the internal reference, then this query returns INTernal, not SENSe
2.
If it was set to SENSe and there is an external reference present, the query returns EXTernal,
not SENSe
3.
If it was set to SENSe and there is a 1 pps signal present, the query returns PULSe, not SENSe
4.
If it was set to EXTernal, then the query returns EXTernal
5.
If it was set to INTernal, then the query returns INTernal
6.
If it was set to PULSe, then the query returns PULSe
Note: In EXM, the SCPI query always returns INTernal for non-controlling instances
Preset For VXT models M9420A/10A/11A/15A: EXTernal
For E7760B, M8920A/20B: INTernal
All other models: SENSe
Backwards [:SENSe]:ROSCillator:SOURce? was query-only in ESA which always returned whichever
Short Range Comms & IoT Mode User's &Programmer's Reference 2144

Keysight x-series Specifications

General

Analysis Bandwidth	Up to 1 GHz (depending on model)
Real-Time Bandwidth	Up to 1 GHz (depending on model)
Form Factor	Benchtop
Connectivity	LAN, USB, GPIB
Resolution Bandwidth	1 Hz to 10 MHz (depending on model)