[wxqc] Sensor drift

[dr.]

Davis claims if you do not put in the elevation and cal to a local standard
then all should be just fine. Horse hockey!!!
N5IHE




On 5/22/2006 10:25:27 AM, spamfree (spamfree at pensom.org) wrote:
> Hi,
> 
> It will. The Vantage Pro console measures the actual pressure (sensor
> pressure) internally, but calculates a sea level reduced pressure 
> value which is what is displayed on the console, and passed on to 
> connected weather programs. Their algorithm uses elevation as well as 
> temperature and humidity in their calculation. The problem is that 
> CWOP only wants altimeter for the pressure which is calculated from 
> the sensor pressure and elevation only. The result is that if you are 
> above around 500 ft elevation, your CWOP submitted pressure will 
> appear to drift when compared to other non-vantage pro stations as the 
> average temperature and humidity change. This is especially noticable 
> after passage of a front and as the seasons change.
> 
> I wrote a freeware tool to address this called VPLive 
> http://www.pensom. org/weather/vptools/vplive.html . VPLive reverses 
> the VP barometer calculation to get the sensor pressure, and then 
> calculates the altimeter from that and sends that to APRS/CWOP.
> 
> You can also play around with the whole pressure calculation issue 
> with this other freeware tool http://www.pensom. 
> org/weather/vptools/vppressurecalc.html
> 
> Steve
> 
> ======= At 2006-05-22, 10:12:44 you wrote: =======
> 
> >I am