[time-nuts] 5065A - Looking for AC XFMR PAECO 9100-2742 specification

paul swed paulswedb at gmail.com
Fri Jul 28 11:21:51 EDT 2017

I looked at your site and the power supply. That makes a lot of sense.
Though I have not lost my transformer as Ulf has at least I see an answer
that I can use. I would have come up with the same approach but you did the
thinking for me.

On Thu, Jul 27, 2017 at 3:58 PM, Poul-Henning Kamp <phk at phk.freebsd.dk>

> --------
> In message <675538475.428966.1501176257165 at mail.yahoo.com>, Ulf Kylenfall
> via t
> ime-nuts writes:
> >Removing that board I discovered that the "24-32V" raw DC was some
> >40 Volts.
> That's a bit on the high side, but not excessively so.
> HP tended to let the linear regulators shave a big slice in
> precision instruments, probably to make sure that absolutely
> no ripple makes it through.
> If I were you, I would ditch the transformer entirely, and go with
> an external DC PSU and put a high-quality DC/DC converter in the
> HP5065A
> See:
>         http://phk.freebsd.dk/hacks/HP5065A/20150930_dcdc/index.html
> --
> Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
> phk at FreeBSD.ORG         | TCP/IP since RFC 956
> FreeBSD committer       | BSD since 4.3-tahoe
> Never attribute to malice what can adequately be explained by incompetence.
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