Agilent Technologies 53181A, Руководство по эксплуатации

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Chapter 2 Operating Your Frequency Counter
Using the Utility Menu
Operating Guide 2-55
2
To Choose the Timebase Source
The menu choices (AUTO, INT, and EXT) in the timebase menu item (TIMEBAS:)
allows you to choose to which timebase source the Counter synchronizes its
operations.
AUTO allows the Counter to be synchronized to the external reference if present, or
to the internal 10 MHz oscillator if no external reference is present.
INT allows the Counter to be synchronized to the internal 10 MHz oscillator.
EXT allows the Counter to be synchronized to an external 1, 5, or 10 MHz house
standard (or reference); this reference signal must be connected to the Counter’s rear-
panel Ref In connector.
Perform the following procedures to choose the timebase source:
1 Press and hold Recall (Utility) key, then cycle POWER key.
2 Press Recall (Utility) key until TIMEBAS: is displayed.
3 Press any one of the arrow keys until desired choice (that is, AUTO , INT , or EXT )
is displayed.