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:[EMAIL PROTECTED] > Sent: Tuesday, January 16, 2007 3:15 PM > To: [EMAIL PROTECTED]; '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 > _______________________________________________ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts