Agilent Technologies 81101A - Page 71

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Using the Agilent 81101A
The Configuration Screen
PLL Reference
Set the frequency reference source for the PLL:

I
NTERNAL
The internal 5 MHz reference.

CLK-IN
An external reference signal at the CLOCK/REF INP. connector. You
can set the expected frequency of the external reference to 5 MHz or
10 MHz.