[time-nuts] HP5065A Rubidium 2nd Harmonic Readings

[paul swed]

John finally pulled out the manual on the 5065 and see the caps. You say
they are tantalums, those are always good for trouble. They are for a heck
of a lot of dampening from what I can see. When I get a moment will check
them out will be interesting if they to have failed.
Regards
Paul

On Fri, Oct 29, 2010 at 6:20 PM, John Miles <jmiles at pop.net> wrote:

> There are a couple of 20 uF axial tantalum electrolytics across the B-C
> junctions of the pass transistors for both the lamp and cell heaters.  They
> were open in my 5065A when I got it, and there was some overheating damage
> on the lamp driver PCB.  Correlation != causation, but since I'm not sure
> what those capacitors were actually supposed to do in the first place, I
> think they're worth checking.
>
> -- john, KE5FX
>
> > -----Original Message-----
> > From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com]On
> > Behalf Of paul swed
> > Sent: Friday, October 29, 2010 6:02 AM
> > To: Discussion of precise time and frequency measurement
> > Subject: Re: [time-nuts] HP5065A Rubidium 2nd Harmonic Readings
> >
> >
> > John,
> > Interested. How might you connect the oven controller to what he
> > is seeing?
> > Bad caps causing it to oscillate, 60 hz modulation, ......
> > I have a 5065 so am always interested in tid bits that I read.
> > Thanks
> >
> > On Fri, Oct 29, 2010 at 12:34 AM, John Miles <jmiles at pop.net> wrote:
> >
> > > How's the photo current?  Does it vary as well?  If not, I
> > don't think I'd
> > > be too worried about the physics package.
> > >
> > > I would, however, check the electrolytics on the oven controller board.
> > >  You
> > > don't want an oven controller failure.
> > >
> > > -- john, KE5FX
> > >
> > > > -----Original Message-----
> > > > From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com
> ]On
> > > > Behalf Of Brian Kirby
> > > > Sent: Thursday, October 28, 2010 9:15 PM
> > > > To: precise time
> > > > Subject: [time-nuts] HP5065A Rubidium 2nd Harmonic Readings
> > > >
> > > >
> > > > I recently had a long term power failure and ran out of UPS time.
>  The
> > > > power was out over a day and when I returned home, it had
> > been restored.
> > > >
> > > > The rubidium recovered, I hit the logic reset button and start and
> got
> > > > the green light.
> > > >
> > > > I made some meter readings, and noticed something I have not seen
> > > > before.  The 2nd Harmonic reading is showing 30 and its bouncing up
> to
> > > > 31 about every 2 to 3 seconds.
> > > >
> > > > Otherwise, the unit seems to be performing nominal.
> > > >
> > > > Anybody ever seen this ?  Hope its not trying to tell me
> > failure of the
> > > > cell is on the way...
> > > >
> > > >
> > > > Brian - KD4FM
> > > >
> > >
> > >
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