[time-nuts] HP10811 dual oven

Dan Kemppainen dan at irtelemetrics.com
Mon Aug 3 15:40:14 EDT 2015


Hi,

If you search the internet, you should come across a design by Warren S. 
It's basically the same type of oven controller that is used in the 
internal oven for that oscillator.

I did a surface mount version of his design a while back. I've been 
running it for quite a while now. IMO it is helping to reduce the 
thermal drift of the oscillator.

Bob has pointed out in the past that the outer oven was not intended to 
be active all of the time. This is probably true. That said it seems to 
help in my setup.

If you are unable to find the documentation, please let me know. I can 
try to dig it up when I get home.

Dan




On 8/3/2015 12:00 PM, time-nuts-request at febo.com wrote:
>
> Hi
>
> The “external” heater on the Z3801 OCXO is only needed if you are regularly running below -20C in your environment. Other than
> the alarm signal, there is no harm in letting it simply shut off forever.
>
> Bob
>
>> >On Aug 2, 2015, at 8:56 AM,timeok at timeok.it  wrote:
>> >
>> >
>> >Hi,
>> >I have seen, but I do not remember where, someone have rebuilt the external oven controller to complete a stand alone OCXO removed from an HPZ3801A.
>> >Can you hep me to find the document?
>> >
>> >Luciano
>> >timeok


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