4 Input/Output Functions
Input/Output
Sense
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
softkey), it will use this signal as an External Reference. If it senses a 1 pulse per second signal, it will use
this signal to adjust the internal reference by adjusting the User setting of the Timebase DAC. When no
signal is present, it automatically switches to the internal reference.
Key Path
Input/Output, Freq Ref In
Example :ROSC:SOUR:TYPE SENS
Couplings If set to SENSe and the analyzer senses a 1 pulse per second signal, it sets the System, Alignments,
Timebase DAC setting to “User”. This setting survives Preset and Power Cycle but is set to
“Calibrated” on a System, Restore Defaults, Align or a System, Restore Defaults, All
Readback Sense
Initial S/W Revision Prior to A.02.00
Modified at S/W Revision A.14.00
Internal
The internal reference is used. A 1 pps signal at the EXT REF IN port, or a signal there between 1 and 50
MHz, will cause a warning triangle to appear in the settings panel next to the word “INTERNAL”, but will
otherwise be ignored.
Key Path
Input/Output, Freq Ref In
Example :ROSC:SOUR:TYPE INT
Readback Internal
Initial S/W Revision Prior to A.02.00
Modified at S/W Revision A.14.00
External
The external reference is used.
Key Path
Input/Output, Freq Ref In
Example :ROSC:SOUR:TYPE EXT
Readback External
Initial S/W Revision Prior to A.02.00
Ext Ref Freq
This key tells the analyzer the frequency of the external reference. When the external reference is in use
(either because the reference has been switched to External or because the Reference has been switched
EMI Receiver Mode Reference 197
To Next Page
Loading...
Need help?
General
