[time-nuts] HP E3610A Power supply

[Tom Van Baak]

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