3 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
116
Sequence Analyzer User's & Programmer's Reference
Содержание E6650A EXF
Страница 34: ...1 About the Test Set Mouse and Keyboard Control 34 Sequence Analyzer User s Programmer s Reference...
Страница 94: ...2 Programming the Test Set Common Commands 94 Sequence Analyzer User s Programmer s Reference...
Страница 129: ...4 Mode Functions Undefined variable Primary ProductName Sequence Analyzer User s Programmer s Reference 129...
Страница 145: ...5 System Functions Undefined variable Primary ProductName Sequence Analyzer User s Programmer s Reference 145...
Страница 206: ...5 System Functions System 206 Sequence Analyzer User s Programmer s Reference...
Страница 214: ...6 List Sequence Measurements File File See File on page 146 214 Sequence Analyzer User s Programmer s Reference...
Страница 474: ...6 List Sequence Measurements Mode Mode See Mode on page 130 474 Sequence Analyzer User s Programmer s Reference...
Страница 478: ...6 List Sequence Measurements Print Print See Print on page 151 478 Sequence Analyzer User s Programmer s Reference...
Страница 642: ...6 List Sequence Measurements System System See System on page 152 642 Sequence Analyzer User s Programmer s Reference...