[time-nuts] HP 5370B low frequency modulation

Björn Gabrielsson bg at lysator.liu.se
Mon Jul 23 03:34:35 EDT 2007

Hej Magnus,

Did you consider switching the 5370 and the 5372 oscillators? Putting the
blame either with the osc or the hosting 5370.



On Mon, July 23, 2007 5:10, Magnus Danielson said:
> ); SAEximRunCond expanded to false
> Errors-To: time-nuts-bounces+bg=lysator.liu.se+bg=lysator.liu.se at febo.com
> From: "Mike Feher" <mfeher at eozinc.com>
> Subject: Re: [time-nuts] HP 5370B low frequency modulation
> Date: Sun, 22 Jul 2007 22:58:00 -0400
> Message-ID: <00b101c7ccd5$490ae6a0$0201a8c0 at gsmacdq14es>
> Mike,
>> Highly unlikely, but, possible, especially if it was in a corrosive
>> atmosphere. Of course then I would expect to see evidence of corrosion
>> on
>> other components. When we do not know the answer we can come up with so
>> many
>> possibilities and not have one of them correct. I have run across a lot
>> of
>> those defective fuses over the years as HP has been using them forever.
>> There was no real evidence as to why they opened, and that is why before
>> I
>> guessed at just plain ageing and the wax eventually getting soft. I just
>> checked the current flow within the oscillator where the fuse used to be
>> plugged in, which was at least nice of them, and always found it to be
>> normal. I just took a piece of buss wire and plugged it into the same
>> two
>> pins were the fuse used to be and never had a problem again. The
>> situation
>> Magnus describes of course is very unusual, and, in reality would only
>> be
>> found by a time nut as it is so miniscule. There is also some
>> periodicity to
>> it, which does suggest some control loop problem, but, I would hate to
>> even
>> take a guess. - Mike
> May I also point out that there may be as low as short low period per 1000
> s or
> about 3-8 (rought estimate).
> I am considering all kinds of possible reasons for it. The group certainly
> has
> more experience shared among them than I have on these, so I concentrate
> on
> observations.
> I wonder if it may be some form of initial shock burnout that I am
> witnessing.
> I have no idea how they are suppposed to look. It is not like you want to
> toss
> your 10811s to the floor just to see how they behave as a result, now is
> there?
> If I where making them I would, but with a thad more of science attached
> to it.
> Cheers,
> Magnus
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