[time-nuts] Bad batch of HP10811's

[Richard (Rick) Karlquist]

The oscillator and oven run on separate power supplies.
Your posting is ambiguous.  I don't know whether you
are talking about the oscillator or the oven.

Rick 

> -----Original Message-----
> From: Jason Rabel [mailto:jason at extremeoverclocking.com]
> Sent: Tuesday, January 16, 2007 3:15 PM
> To: richard at karlquist.com; 'Discussion of precise time and frequency
> measurement'
> Subject: RE: [time-nuts] Bad batch of HP10811's
> 
> 
> Here's one for you guys...
> 
> What would the cause be when you power one up, and it seems to try to
> oscillate, but then powers down (current consumption drops way down)?
> 
> Thermal fuse again or just toast?
> 
> Jason
> 
> 
> > I'll apolgize on behalf of HP for putting in that stupid thermal
> > fuse.  It cannot be soldered in for the obvious reason that the
> > soldering temperature exceeds the fusing temperature.  Therefore,
> > it must be socketed.  It does NOT have gold plated leads, and
> > hence the reliability of the contact with the socket is poor.
> > I think the reason for it was that if the oven ran away, the
> > thermal foam would burn up and out-gas toxic fumes.  Ovens very
> > rarely run away.
> > 
> > The unit that is 500 Hz off is not due to a cold oven.  There isn't
> > that much tempco in the crystal.
> > 
> > Rick Karlquist N6RK
>