[Test-Equipment] Phase lock on military version of HP 8640B generator?

[Jerry Mulchin]

According to the 1983 HP data book, the 8640B has the locking ability. If you have
6 pushbuttons upper dead center of the control panel, then you have the locking
option as well as counter X10/X100 setting, and +1/2 digit setting. Otherwise,
if you don't have these pushbuttons, then you don't have the locking option. The
locking option allows for 5 x10-8/hr frequency stability

That is what I know.

Jerry Mulchin - N7EME
JWM Engineering Group
http://jwmeng.com


At 11:48 PM 12/6/2005 -0500, Mike Czuhajewski wrote:
>I have one of the big, yellow AN/USM-323 signal generators, also known as
>the HP 8640B with option 323. I read that the commercial version has a front
>panel control that allows phase locking the output to an internal reference
>oscillator for stability. The question is how this relates to the yellow
>military version. In some places I've read that it does not have the
>external control and that the phase lock is on all the time, and elsewhere I
>read that it does not even have the phase lock. I don't know which is
>correct.
>
>My unit drifts slowly for several hours before finally settling in. Is that
>normal for this unit, not having the phase lock circuitry, or perhaps it
>does have it but it's broken?
>
>73 DE WA8MCQ
>
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Jerry Mulchin