Re: [time-nuts] HP10811 Oscillator Thermal Fuse

: [time-nuts] HP10811 Oscillator Thermal Fuse https://www.febo.com/pipermail/time-nuts/2017-May/date.html While I find traces of your article quoted, it seems to have vanished. It lead me to this interesting article of 16 pages on electronic fires by a fire investigator. There is a lot here

[time-nuts] HP10811 Oscillator Thermal Fuse

https://www.febo.com/pipermail/time-nuts/2017-May/date.html While I find traces of your article quoted, it seems to have vanished. It lead me to this interesting article of 16 pages on electronic fires by a fire investigator. There is a lot here for designers when it comes to preventing fires

Re: [time-nuts] HP10811 Oscillator Thermal Fuse

crowave instrument. > > πθ°μΩω±√·Γλ > WB0KVV > > -- Forwarded message -- > From: Bob kb8tq <kb...@n1k.org> > Date: Thu, May 11, 2017 at 4:28 PM > Subject: Re: [time-nuts] HP10811 Oscillator Thermal Fuse > To: Discussion of precise time and frequency measur

[time-nuts] HP10811 Oscillator Thermal Fuse

or and expensive microwave instrument. πθ°μΩω±√·Γλ WB0KVV -- Forwarded message -- From: Bob kb8tq <kb...@n1k.org> Date: Thu, May 11, 2017 at 4:28 PM Subject: Re: [time-nuts] HP10811 Oscillator Thermal Fuse To: Discussion of precise time and frequency measurement <time-nuts

Re: [time-nuts] HP10811 Oscillator Thermal Fuse

Hi A bit in jest:… that compares to 3,957 incidences of open fuses that had nothing to do with a thermal runaway. Of those, the majority 3,721 resulted in the 10811 being tossed in the garbage as “another junker”……(yes, those are estimates, but I’d bet they are close based on the number of

Re: [time-nuts] HP10811 Oscillator Thermal Fuse

On 5/11/2017 4:25 AM, Bob kb8tq wrote: Ultimately it all came to no good. The energy conservation rules simply took over. Shutting down everything during off hours became the way a lot of outfits did things. Don’t turn off all A couple of comments on this, probably no surprise to many time

Re: [time-nuts] HP10811 Oscillator Thermal Fuse

Hi > On May 11, 2017, at 11:22 AM, Bill Hawkins wrote: > > Labs could have used a common gas heater for the crystal ovens, with a > bit of rewiring. > > No fire hazard there - you've got a chimney. Also, flame safety is well > developed for gas heaters. > > Would have

Re: [time-nuts] HP10811 Oscillator Thermal Fuse

Labs could have used a common gas heater for the crystal ovens, with a bit of rewiring. No fire hazard there - you've got a chimney. Also, flame safety is well developed for gas heaters. Would have required throttling gas flow control. Bill Hawkins Another possibility is circulating hot water.

Re: [time-nuts] HP10811 Oscillator Thermal Fuse

Hi Ok, well since I was *asked* to say more :) Long ago heavy users of this sort of gear figured out that you wanted to keep the OCXO’s on all the time. That was the way to make the gear the most stable. That is the way you can use your counter / generator / whatever when you get to work in

Re: [time-nuts] HP10811 Oscillator Thermal Fuse

Hi You will get a lot of diversity of opinion on the topic of the thermal fuse on the 10811. My feeling is that they are a nuisance and contribute very little to the design. I’d just short it out and move on. In the era of failure prone heater transistors or faulty thermistors, the fuse may

[time-nuts] HP10811 Oscillator Thermal Fuse

https://www.febo.com/pipermail/time-nuts/2017-May/date.html We got a new beam tube for our #2 HP5061B cesium clock. When the tube was changed, it momentary locked for a couple of minutes but then unlocked. The oscillator had been set on frequency with our #1 HP5061B a while back but it was