Agilent Technologies 53150A Manual de Instruções Página 126

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Chapter 4 Command Reference
[:SENSe]:FUNCtion Subtree
4-30 Programming Guide
4
[:SENSe]:ROSCillator Subtree
This subtree controls the Reference Oscillator.
COMMAND [:SENSe]:ROSCillator:SOURce . . . <character_program_data>
Sets or queries the current reference timebase to INTernal or EXTernal.
QUERY RESPONSE A sequence of ASCII-encoded bytes: INT or EXT
COMMENTS *RST: INT
INTernal indicates the timebase is the internal reference. EXTernal
indicates the signal at the external reference input (located on the rear
panel of the Counter; Reference connector) is the reference timebase.
The Counter does not switch to EXTernal unless a suitable 1, 2, 5, or
10 MHz signal is present on the “Reference” connector on the back panel.
Execution of the command (that is, explicitly selecting internal or
external timebase) sets [:SENS]:ROSC:SOUR:AUTO to OFF.
If this is set to EXT, and no valid external signal is available at the
back-panel Reference connector, the front-panel frequency display may
show an error message.
If this is set to INT, the 10 MHz signal generated by the internal
reference oscillator is available as an output on the back-panel
Reference connector.
RELATED
FRONT-PANEL
KEYS
Shift + Menu (REF OSC > INT | EXT)
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