[time-nuts] HP quality... a HP5065A experience

[paul swed]

Other thing I have noticed is that some wires simply rot off. I think it may
be the flux that eats the wires after 20 years or so.

On Sat, Sep 10, 2011 at 1:26 PM, J. Forster <jfor at quikus.com> wrote:

> That is not a unique incident.
>
> I'm interested in LASER Interferometry. Attached is a pic I took of an HP
> 5529A LASER head.
>
> (Aside: If anybody is interested, there is a Yahoo Group for LASER
> Interferometer fans)
>
> Note the two leads to CR5 near the top, center of the pic. They go to a
> feedback photocell and obviously have never been trimmed or soldered.
>
> The unit ran fine that for several months before suddenly failing.
> Soldering the leads fixed the LASER head.
>
> Best,
>
> -John
>
> =========
> > Dear time-nuts,
> >
> > As I am trying to bring a HP5065A back into operational mode, I have
> > been looking at the Cell oven and Lamp oven readings, but it has been
> > jump. While looking at it with a friend (a true soldering master) I
> > popped the lower lid and he found that one of the wires was not
> > soldered. Sure enough this was one of the taps from the A11 board for
> > the front panel. It has been like this when it was assembled, so the HP
> > quality checks didn't catch it.
> >
> > I do beleive that the other end have the same problem, the selector
> > switch shows the same unstable behaviour, but is harder to check. I have
> > not yeat figured out how I pop the front end off so I can access the
> > rotary switch properly.
> >
> > So be aware of wires. A bad solder joint doesn't seem to be there, but
> > lacking solder joints was a bit surprising.
> >
> > I have trouble with this old beast, it does not lock so caring about
> > basics like ovens and oscillator tunings has been my starter approach.
> > The rubidium Cell and Lamp ovens (pin 2 and 14) seems to stabilize at
> > 15,75 V rather than the 18 V which the manual indicates should be the
> > normal.
> >
> > I cannot honestly say I spent quality time on it yet. Hope to get up to
> > speed on it.
> >
> > Cheers,
> > Magnus
> >
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>
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