[time-nuts] HP E3610A Power supply

[Didier Juges]

Tom,

I just started getting messages again today after almost a week of getting nothing.

This account is on gmail

No idea what happened...

Didier KO4BB


On June 18, 2014 10:42:25 PM CDT, Tom Van Baak <tvb at LeapSecond.com> wrote:
>Paul,
>
>The E3610A posting was a good one. This explains why some high-end
>oscillator sockets have a fuse, series diode, and zener shunt -
>protects the expensive oscillator from both reverse- and over-voltage.
>
>I'll look into the spam issue. If there's more than a couple contact me
>off-list and we'll debug it.
>We've been having issues with aol, yahoo, comcast postings recently.
>Might be related.
>
>When in doubt, you can always read messages at:
>    http://www.febo.com/pipermail/time-nuts/
>
>Sometimes it's actually more convenient to read them there by author or
>thread than by inbox.
>
>/tvb
>
>----- Original Message ----- 
>From: "paul swed" <paulswedb at gmail.com>
>To: "Discussion of precise time and frequency measurement"
><time-nuts at febo.com>
>Sent: Wednesday, June 18, 2014 7:41 PM
>Subject: Re: [time-nuts] HP E3610A Power supply
>
>
>> Bert just finding out that google mail is treating your emails as
>spam!
>> Not sure if the message appears but as you can see it questions who
>you are.
>> I found numbers of missing emails a few minutes ago.
>> Regards
>> Paul
>> WB8TSL
>> 
>> 
>> On Thu, May 22, 2014 at 7:59 AM, <EWKehren at aol.com> wrote:
>> 
>>> This may be off topic but I did check with Tom and many time nuts
>may have
>>> HP E3610A power supplies on their bench and mine smoked a ublox GPS
>so that
>>>  makes it topic related..
>>> The reference section has some 1 uF 50V capacitors and in my unit
>one
>>> shorted. The reference section has fuses on the board but they did
>not
>>> open. The
>>>  7912 overheated and shorted out,  traces are discolored the op amp 
>shows
>>> signs of overheating and burned out. The result was the output went 
>to
>>> 30V+
>>>  and next morning the ublox chip plastic showed where the chip 
>smoked. As
>>> a minimum I recommend replacing the 1 uF capacitors with new quality
> caps,
>>> I also ordered 15 V 5 W zeners and 0.5 A 20 mm glass fuses.
>>> Bert Kehren
>
>
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-- 
Sent from my Motorola Droid Razr HD 4G LTE wireless tracker while I do other things.