Randy, hi again,
My idea sounds crude but it worked very well. The outer box was made out
of small squares of aluminum drilled and taped with small aluminum angle
pieces. I have two references in this oven, a fluke circuit based on the
731b, and one of Doug’s 10 volt references. I run the oven at 45°C. The
gray board for the inner cover is ‘GATOR Board’ used to mount prints, it
has a foam core. You should also have a guarded transformer, got mine
from scrape fluke 510,
Dallas
On 7/6/2015 10:09 PM, Dallas Smith wrote:
Hi Randy,
I used a box in a box then shot yellow window or gap fill insulation from your
hardware store, use minimal expanding type. Fill around the spaces between the
boxes with the tube but very slowly. You will get this on your hands so use
your gloves because you will have to hold the boxes in place as it expands.
After it dries cut the top off with a bread knife. May take a couple of tries
to get what you want.
Dallas
Date: Mon, 6 Jul 2015 17:43:45 -0700
From: [email protected]
To: [email protected]
Subject: [volt-nuts] Oven thermal insulation
I am working on a voltage reference deisgn that will go into an oven for
the highest stability. I am looking for a good insulation material that
can stand high temperatures safely (up to 80C). Looking at some HP
frequency standard ovens I see a hard, light-weight insulation material of
some type that looks like it would work really well, but I have no idea
what it is. Does anyone have any suggestions?
Thanks,
Randy Evans AE6YG
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