Keysight x-series Instruction Manual

6 Input/Output
6.6 Freq Ref Input
Compatibility
Notes
reference the instrument was using. The instrument automatically switched to the ext ref if it was
present
In PSA (which had no sensing), [:SENSe]:ROSCillator:SOURce set the reference (INT or EXT),
so again its query returned the actual routing
Thus, the query is 100% backwards compatible with both instruments
Backwards Compatibility Command
Notes For PSA compatibility the command form is provided and is directly mapped to [:SENSe]:ROSCil-
lator:SOURce:TYPE
Note: In EXM, the command does nothing for non-controlling instances
Backwards
Compatibility
SCPI
[:SENSe]:ROSCillator:SOURce INTernal | EXTernal
More Information
When the frequency reference is set to internal, the internal 10MHz reference is
used even if an external reference is connected.
When the frequency reference is set to external, the instrument will use the external
reference. However, if there is no external signal present, or it is not within the
proper amplitude range, a condition error message is generated. When the external
signal becomes valid, the error is cleared.
When the frequency reference is set to Pulse, the instrument expects a 1 pulse per
second signal at the EXT REF IN input. The instrument uses this signal to adjust the
frequency of the internal reference.
If Sense is selected, the instrument checks whether a signal is present at the
external reference connector. If it senses a signal within 5 ppm of the External Ref
Freq (as set on the External Ref Freq control), it will automatically switch to the
external reference. If it senses a 1 pulse per second signal, it enters Pulse mode,
wherein the signal is used to adjust the internal reference. When no signal is
present, it automatically switches to the internal reference. No message is
generated as the reference switches between pulse, external and internal. The
monitoring of the external reference occurs approximately on 1 millisecond
intervals, and never occurs in the middle of a measurement acquisition, only at the
end of the measurement (end of the request).
If for any reason the instrument’s frequency reference is not able to obtain lock,
Status bit 1 in the Questionable Frequency register will be true and a condition error
message is generated. When lock is regained, Status bit 1 in the Questionable
Frequency register will be cleared and the condition error will be cleared.
2145 Short Range Comms & IoT Mode User's &Programmer's Reference

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)