[time-nuts] HP10811 problem - wrong frequency

[John Miles]

Yes, I don't think a broken oven controller is going to pull the frequency
off by 890 kHz. :-)

-- john, KE5FX

> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com]On
> Behalf Of Tim Shoppa
> Sent: Sunday, January 13, 2008 12:13 PM
> To: time-nuts at febo.com
> Subject: Re: [time-nuts] HP10811 problem - wrong frequency
>
>
> Jim Miller schrieb:
> >> i have a problem with my HP10811 ocxo. I connected it properly
> to 24V, 12V
> >> and to my counter to measure its frequency. The measured
> frequency is 10.887
> >> MHz, but it should be 10MHz (also noted on the 10811). A 5MHz tcxo is
> >> measured correctly, so i think the counter is okay. Can anyone
> help me ?
> >
> > There is a thermal fuse on the oven control board which sometimes
> > blows due to age, or it vibrates out, or otherwise fails.  This causes
> > the oven to not operate and the unit is guaranteed to be off frequency
> > by a large amount.
>
> Wow, it's interesting to see what "large amount" means to different
> folks.
>
> To some, it's a few parts per billion.
>
> To others, it's nearly 10% (umm, ninety million parts per billion).
>
> Tim.
>
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