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Kenneth S
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Joined: 31-July 10
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Last Seen: 11th May 2016 - 11:40 PM
Local Time: Sep 23 2017, 05:57 AM
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Kenneth S

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30 Apr 2016
I've been having some trouble with the barometer on my weather station (VP2) drifting. I have two consoles which rarely agree with each other, and usually differ from surrounding airports. With my closest airport about fifty miles away, accurate calibration can be difficult. I do not wish to make a bad name for Davis, as they are the most accurate and reliable station I know of in all ways besides pressure. I would like to put my data on CWOP, and I do not wish to provide inaccurate data. A meteorologist acquaintance has offered to come calibrate my barometer with an extremely accurate calibrated device, but I'm sure he does not wish to drive 200 miles every month to check my Davis.

Does anyone have a suggestion for an accurate barometer which could be used to check/recalibrate my Davis as needed.

What about mechanical? The Maximum Proteus specifies accuracy of +- .08"Hg. Does anyone have experience with this, or similar? If these specs are to say +.07" in the morning -.07" in the afternoon is a common error, I need something better. If it is still within .08" after 20 years it is far superior to my Davis which sometimes gains .10" in a month (rarely needs to be adjusted "up").

In searching for "accurate barometer" online I've found some electronic instruments in the $2,000 to $4,000 range that are supposed to be good, but I can't afford such at this time. Any experience/suggestions would be much appreciated.
31 Oct 2015
Finally got my Vantage Pro 2 online and successfully uploading to the Weatherlink network.
When logged on to my account at Weatherlink.com, I see Wunderground as a site to which
I can upload data. If I choose to upload to the Wunderground network, will the Weatherlink
network send my data to Wunderground, or will my computer do the upload? The fact that
the upload settings are on the Weatherlink webpage as opposed to the Weatherlink software
would suggest that the network is sending data to Wunderground, but just wanted to be sure.

Why does it matter? I do not have unlimited internet at the time, and I do not wish to double data
usage by having my computer uploading to two different websites unnecessarily. I've also noticed
that my weatherlink software tends to stall (anemometer "wait" icon appears and I cannot click)
when uploads are taking place. The latter is not a huge issue, but certainly makes use of the
software less smooth, and is not something I wish to compound.
31 Jul 2010
Are there any special tricks to getting an accurate reading with a sling psychrometer? The instructions provided with the instrument seem quite basic: saturate the wet bulb wick, whirl the instrument until no thermometer movement is detected, and compare with a chart.

AccuWeather, my Vantage Pro, and a digital handheld psychrometer all suggest I should be getting more wet bulb depression, usually about 3 degrees F. What could I possibly be doing wrong? I avoid touching the wick, use reverse osmosis water and read the wet bulb first. Even refrigerating the instrument before using it makes no difference; the wet bulb temp will rise to the same (too high) reading. I usually whirl the instrument at about 2 revolutions per second, have tried faster/slower, but didn't see much difference. It seems the wet bulb has reached it's minimum temperature after about two minutes regardless how fast I spin it. I hold the psychrometer at arms length and upwind from myself. Wet days, dry days, hot, or cold, I always measure humidity higher than it really is.

Someone suggested spirit filled psychrometers are less accurate than the mercury type, so I purchased a mercury filled psychrometer as well. The two agree precisely.

Any suggestions would be greatly appreciated.
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