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Input/Output
present, it automatically switches to the internal reference. No message is generated as the reference
switches between 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 2 in the
Questionable Frequency register will be true and a condition error message is generated. When lock is
regained, Status bit 2 in the Questionable Frequency register will be cleared and the condition error will
be cleared.
If an external frequency reference is being used, you must enter the frequency of the external reference if
it is not exactly 10 MHz. The External Ref Freq key is provided for this purpose.
Key Path: Input/Output
Remote Command: [:SENSe]:ROSCillator:SOURce:TYPE
INTernal|EXTernal|SENSe
[:SENSe]:ROSCillator:SOURce:TYPE?
Preset: This is unaffected by a Preset but is set to SENSe on a "Restore Input/Output
Defaults" or "Restore System Defaults->All".
State Saved: Saved in instrument state.
Status Bits/OPC dependencies: STATus:QUEStionable:FREQuency bit 2 set if unlocked.
Backwards Compatibility Notes: 1. Freq Ref In was not saved in state in the legacy instruments. It is a part of
state in the X-Series.
Initial S/W Revision: Prior to A.02.00
Remote Command: [:SENSe]:ROSCillator:SOURce?
Notes: The query [SENSe]:ROSCillator:SOURce? returns the current switch setting.
This means:
1. If it was set to SENSe but there is no external reference so the instrument
is actually using the internal reference, then this query returns INTernal
and not SENSe.
2. If it was set to SENSe and there is an external reference present, the query
returns EXTernal and not SENSe.
3. If it was set to EXTernal, then the query returns "EXTernal"
4. If it was set to INTernal, then the query returns “INTernal”
Preset: SENSe