Discussion:
time-nuts Digest, Vol 156, Issue 35 (5065A Pwr Xfmr - Too high output voltage)
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Ulf Kylenfall via time-nuts
2017-07-29 08:13:21 UTC
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Yepp.
That was a brilliant idea...
...until I realized that I needed 115V for the XO quick-heaterand we use 230V in Europe...
So the SMPS splution will not work for me.
I will use an old (dual primary winding) linear supply which has the advantage of providinga regulated 24V that can be used for the heater windings of the rubidiumcavity.
Ulf - SM6GXV


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Today's Topics:

  1. Re: 5065A - Looking for AC XFMR PAECO 9100-2742    specification
      (paul swed)


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Message: 1
Date: Fri, 28 Jul 2017 11:21:51 -0400
From: paul swed <***@gmail.com>
To: Discussion of precise time and frequency measurement
    <time-***@febo.com>
Subject: Re: [time-nuts] 5065A - Looking for AC XFMR PAECO 9100-2742
    specification
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Poul
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.
Thanks
Paul
WB8TSL
--------
via t
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
        http://phk.freebsd.dk/hacks/HP5065A/20150930_dcdc/index.html
--
Poul-Henning Kamp      | UNIX since Zilog Zeus 3.20
FreeBSD committer      | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.
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Poul-Henning Kamp
2017-07-29 09:05:28 UTC
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Post by Ulf Kylenfall via time-nuts
That was a brilliant idea...
...until I realized that I needed 115V for the XO quick-heaterand we use 230V in Europe...
The quick-heater isn't that important, unless you are a very impatient
person.

It is also, as I understand it, the primary reason for fried out
OCXOs...

See also:

http://phk.freebsd.dk/hacks/HP5065A/20150925_ocxo_preheat/index.html
--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
***@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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