[Premium-Rx] HP8640B Manual - Includes the 8649B variant ;>)

[John Miles]

"The 8640B does not do true phase-locking when the "Lock" button is pressed.
It's a frequency-locking scheme: they latch the value of the counter LSD
when you hit Lock, and from that point on, any output frequency deviation
that would result in LSD drift is corrected. So you will definitely see FM
sidebands with deviation related to your current counter resolution. You can
hit the 'X10' or 'X100' buttons to raise the LSD resolution and reduce the
FM in lock mode, but it'll never go away entirely."

Although, to be fair, this ended up being debated endlessly, so what I wrote
back then shouldn't be taken as gospel.  (Frequency lock or phase lock?
Only Carly Fiorina knows for sure.)

-- john KE5FX
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