HP 53150A Series Programming Manual page 130

Chapter 4 Command Reference
[:SENSe]:FUNCtion Subtree
[:SENSe]:ROSCillator Subtree
This subtree controls the Reference Oscillator.
[:SENSe]:ROSCillator:SOURce . . . <character_program_data>
COMMAND
Sets or queries the current reference timebase to INTernal or EXTernal.
A sequence of ASCII-encoded bytes: INT or EXT
QUERY RESPONSE
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COMMENTS
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•
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Shift + Menu (REF OSC > INT | EXT)
RELATED
FRONT-PANEL
KEYS
4-30
*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 toEXT, 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.
Programming Guide