Sandaysoft

Correcting humidity simply by adding a multiplier or offset results in distortions at the top end of the scale i.e approaching 99% (where I want it to be about right, assuming the instrument isn't too far off there)
I've been playing with a correction factor that is manually applied via spreadsheet using the difference beween 99% and the instrument reading, so the greater corrections occur when humidity is low, and disappear at 99%. Improvements have been gained to my F.O. readings (compared to a sling psychrometer), but it'll never be 'right', as the humidity data of these stations would only be really correctable by using lookup tables individual to every station.
Having said that, I'd still like to see a correction offset provided for internal humidity, which consistently reads about 10% low (over the relatively narrow range of internal conditions)

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My in-accurate humidity reading seems fairly apparent today compared with those stations around me if you look at this site: http://www.awekas.at/en/qualcheck.php?art=hum&id=8883

At least the plotline is the right shape....just abit too high on the scale

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Richard

A multiplier of 0.78 will get you pretty close, most reading within +/- 1, with a couple of outliers (max 3.26)

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Mark
Wilmslow Astro Weather