[wxqc] Dew Point calibration

[Jack J. Mowers, CLU, ChFC]

Got it!  Thanks!!!  Jack

-----Original Message-----
From: wxqc-bounces at lists.gladstonefamily.net
[mailto:wxqc-bounces at lists.gladstonefamily.net] On Behalf Of Sam Drinkard
Sent: Wednesday, February 22, 2006 8:18 PM
To: Discussion of weather data quality issues
Subject: Re: [wxqc] Dew Point calibration

Jack,

    About the only reason I could think of for it to move the wrong 
direction would be for you to have gone the wrong way with the 
adjustment.  If the numbers on Phillip's graphing page are positive 
numbers, that means the sensor is reading too cold or too low.  You 
would want to make the temperature or humidity higher than it is, (as 
displayed on the console).  Yes, for now, just increase by 1 degree.  
You can get a feel for what is going to happen by doing that, then 
looking at the 3 day averages.  If still getting worse, back up the 
control opposite from the way you went the first time.  It's also 
possible the current wx system over you is too unstable to try any kind 
of tweaking.  Really, it's best done when you have little change in 
things, or at least more of a linear change, without a lot of drastic 
"jumps" in any parameter.

Sam

Jack J. Mowers, CLU, ChFC wrote:

>Sam, Should I tweak it up 1 point from where it is now?  Or just 1 point up
>from the beginning?  Is there any reason why the 3 day dew point number got
>worse when I moved it up 2 points?  Thanks.  Jack
>
>-----Original Message-----
>From: wxqc-bounces at lists.gladstonefamily.net
>[mailto:wxqc-bounces at lists.gladstonefamily.net] On Behalf Of Sam Drinkard
>Sent: Wednesday, February 22, 2006 7:43 PM
>To: Discussion of weather data quality issues
>Subject: Re: [wxqc] Dew Point calibration
>
>Hi Jack,
>
>Looking at your graphs, I'd say you should maybe tweak the humidity up 
>by one degree, let it settle in for a few days, or until you get a 
>semi-stable pattern over you. If things are still running low, tweak it 
>up a little bit more, depending on how far off, but in any event, what 
>you want to do is make changes in small increments, wait for a period, 
>check it, then if necessary, adjust again.
>
>I've got the WM-II, so I have nothing I can tweak exept via the console, 
>and that's what I do (I do cheat and use weatherlink's setup mode) then 
>just watch things. With such unstable conditions over me right now, I'm 
>seeing rather large changes from the std deviation, but I don't worry 
>about it. The long term averages are still very good in my book.
>
>Hope this helps some...
>
>Sam
>
>Jack J. Mowers, CLU, ChFC wrote:
>
>  
>
>>I'm trying to dial in my dew point calibration. I've had my station up 
>>and running for almost a month. I've got the barometer, and 
>>temperature calibrated pretty well. (I think) I just can't get the dew 
>>point figured out. I have a Davis Vantage PRO2. I can't calibrate the 
>>dew point, but I can calibrate the humidity. Yesterday, I moved the 
>>humidity up 2 points. Today I checked the quality control 3 day graphs 
>>and the numbers are slightly worse. I was wondering if anyone could 
>>tell me which way I need to move the humidity in order to get the dew 
>>point numbers in line. Below is a link to my 3 day numbers: Thanks. Jack
>>
>>http://weather.gladstonefamily.net/site/C5283?tile=10;days=3#Data
>>
>>Jack J. Mowers, CLU, ChFC
>>
>>Office: 949-454-2994
>>
>>Fax: 949-454-2997
>>
>>Email: jackmowers at hotmail.com <mailto:jackmowers at hotmail.com>
>>
>>Website: www.jackmowers.com <http://www.jackmowers.com/>
>>
>>26741 Portola Pkwy Ste 1E #514
>>
>>Foothill Ranch, CA 92610
>>
>>CA License # 0698078
>>
>>
>>    
>>
>
>  
>


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