[time-nuts] Re: HP-10811B thermal fuse

[Bob Camp]

Hi

Yup

That’s how everybody else does it ….

The MTBF of the fuse is horrible compared to the rest of the OCXO. The price of the fuse is non-trivial compared to what an entire OCXO costs on eBay. Even if HP didn’t suggest it, there still are very good reasons to go that way. 

Bob

> On Jan 20, 2024, at 5:29 AM, Taka Kamiya via time-nuts <time-nuts at lists.febo.com> wrote:
> 
> I seem to recall HP's official recommendation is to remove the fuse and substitute it with a simple jumper.  I think there is a bulletin for this.  (which I cannot find now)
> --------------------------------------- 
> (Mr.) Taka Kamiya
> 
> 
> 
>    On Saturday, January 20, 2024 at 01:19:58 AM EST, John or Susan via time-nuts <time-nuts at lists.febo.com> wrote:  
> 
> The thermal fuse in my 10811B oscillator has opened. Troubleshooting 
> results say that the oven is ok, but I do need to replace the fuse and 
> cannot find any information about it. The manual says the Mfg. number 
> was 2110-0617, and the HP part number was 10811-80008. I am guessing 
> something on the order of either 1/2 A slow-blow or 1 A regular fuse. 
> Can anyone provide any guidance as to the proper fuse? Also any thoughts 
> as to why it failed would be appreciated. It is part of a home-brew 
> GPSDO, mounted in a case right next to ventilation slots.
> 
> John W2TX
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