[time-nuts] How long do ovens take to cool to ambient after power is removed?

Tim Shoppa tshoppa at gmail.com
Wed Oct 1 14:00:32 EDT 2014


Typical 10811 warm-up time is circa 10 minutes; cool-down time is actually
several times longer (since there is no active "cool-downer" in the case!)

More modern, smaller OCXO's will warm up and cool down more quickly.

If it's a double oven or user has added extra insulation around the basic
OCXO, the times have to get longer. I remember someone here wanting to put
his OCXO in a Dewar. As we used to say at Caltech, "Whatever fills your
Dewar!".

Not to be confused with "bake out" time!

Tim N3QE

On Wed, Oct 1, 2014 at 1:07 PM, Dr. David Kirkby (Kirkby Microwave Ltd) <
drkirkby at kirkbymicrowave.co.uk> wrote:

> Following on from my question the other day about the type of
> oscillator in the HP 8720D VNA, I finally got around to setting this
> up on the spectrum analyzer today. Luckily, some software I wrote back
> in 2008 for a friends HP 70000 system was easy to modify to grab the
> save the frequency. So I can now grab the data. I will post a plot
> later, once I have collected the data from a cold start. But it got me
> wondering, how long do ovens take to cool? I'm sure it must depend
> somewhat on the oven.
>
> According to someone on this list (sorry forget who), the option 1D5
> is an oven, but not a particularly good one. Unfortunately he can't
> share the data he has on it, which is a bit annoying, but I understand
> his reasons.
>
> Anyway, later today (tomorrow ??) I will post a plot of frequency vs
> time. The question is though, how long is thing thing likely to take
> too cool?
>
> My lab is air-conditioned, set at 23 deg C, though it varies about +/-
> 1.5 deg C from that.
>
> Dave
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