From: ???????????????
Subject: Radio Shack Calibration !!!

Hello Fellow Puffers:

Well hells bells... I read the #183 Pipe Digest and was very impressed with
the posting concerning "How to Re-Callibrate Your Radio Shack 63-855
Hygrometer." It was difficult to determine who created this posting
originally, (Peter Shanken? Bob Curtis? Both?) but THANK YOU !!!!!

I would like to add some new information. I have one of the older Radio Shack
hygrometers #63-844, but do you think that stopped me? You give me an
opportunity to take something I know nothing about apart, I'm there! Plus, my
Dad was a quality assurance engineer and he wouldn't have put up with that
much of a error factor.

Well the salt portion of this whole procedure is sweet indeed - so simple, I
felt like I was watching "Mr. Wizard" again. After doing this I found that my
hygrometer was a whopping +8% off. Now... I'm not great with math, so I
decided to correct the problem instead of just knowing how much it's off by.
The problem was, which "pot" screws to adjust, since the instructions were
for a #63-855. Well for those of you that have the same model as I do, there
are two circut boards in it, the top one is for the temperature and the
bottom is for the humidity. The "pot" screw CLOSEST to the battery
compartment is the one you need to adjust. And yes, as was mentioned in the
first posting, it does take some fiddling!!! There were times I'd adjust the
screw, and see no change.  But I finally got that puppy within + -1%. 

Let it be known that I tinkered where no person in their right mind should,
and this is no guarantee that it'll work for you (especially knowing Radio
Sahck stuff - yours could be laid out differently?) But if your bold, go
where no man has gone before and make it right!

Thanks Gang!
Steven Banks


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