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

[J. Forster]

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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