Topic: WMR968 Wind Speed Adjustment

[Chummy57C]

Well, I was shocked and disappointed to discover the Ambient Weather support forum disappeared sometime this week.  After repairs and recovery work on my computer due to damage from a storm earlier this summer, I'm getting my WMR 968 weather station operational -- and I know there was information on that forum about what factor the wind speed needs to be adjusted with VWS to produce more accurate wind speed readings on this station.  I recall it was 1.1 but it may have been 1.25.  In other words, if the station is reporting a wind speed of 10, it's actually low and by calibrating with VWS software the correct reading would be 11 to 12.5 mph.

If anyone else has information on this please let me know.  Thank you in advance!

[jwyman]

Welcome abaord Chummy!

   The value I have seen on the old forum was 1.25... That is what I have mine set to and that seems to be correlating well with other units....


Jim

[Chummy57C]

Cool, thanks for the quick reply, Jim!

[sam2004gp]

Please someone elaborate more, I was not aware of this issue.

[jwyman]

The OSI WMR968 anemometer ( possibly other models of OSI)  seems to report ~ 25% lower readings than the Davis and other units. By putting a gain factor in the sensor for 1.25 , it brings it closer to the actual readings of others units.....


Jim

[sam2004gp]

Is there a way to verify your readings?

Or should I remove my anemometer  and hold it outside the car window while traveling at 65MPH.   

I wish there was a way to calibrate the numbers on the console.  I have two consoles(one for VWS, one in the family room) and one set of sensors. 

[jwyman]

You set the gain in VWS... That way, the data going out is correct. There is no gain offeset for the console.

Jim

[sam2004gp]

You set the gain in VWS... That way, the data going out is correct. There is no gain offeset for the console.

Jim

Yes, I was aware of that, but who knows perhaps others are not.

[W Thomas]

Welcome abaord Chummy!

   The value I have seen on the old forum was 1.25... That is what I have mine set to and that seems to be correlating well with other units....


Jim

I remember reading somewhere..may have been in the VWS manual about the wind speed correction and It seems it mentioned what Jim is saying and maybe somewhere else it mentioned if there are
trees obstructing the wind flow that a offset of 2 may help correct that.  My location is well blessed with trees,which I am working on getting rid of, so I settled on a +2 offset.
My wind speeds seem more realistic after that adjustment..

Glad you are getting everything closer to back up running 100% ! It is sure a bummer when the very thing you are monitoring takes out your ability to monitor it 

Wayne

www.smythweather.net

cw8217