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I'm a software engineer by trade... so I decided to make my own digital hygrometer for my build effort. Long story short, I got my sensor circuit working and a short program to read the relative humidity. Now I needed to calibrate it. I did a search and found a method that is supposed to work. I'm curious if you guys have ever heard of it.

1 Put salt in the lid of a milk jug.
2 Put a few drops of water in the salt. Just enough for it to look like wet sand.
3 Put top and hygrometer into a baggie
4 Seal baggie at let it set for 6-8 hours (6-8 is the only variation in the story I've found)
5 After wait, hygrometer should read 75% humidity. If not then calibrate acccordingly.

You guys ever heard of this? and if so, WHY does it work? I work in true/false all day long. How on Earth is it garaunteed to be 75% in that baggie?

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nay

My blogs
Hand Made Gutar
Woodworker++

guess who didn't use the SEARCH FUNCTION!

Thanks Hesh, you da man.

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nay

My blogs
Hand Made Gutar
Woodworker++

Yes. I have calibrated 3 abbrelons (sp) that way it worked very well.

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Brock Poling
Columbus, Ohio
http://www.polingguitars.com