[wxqc] VP2 Hygrothermometer

[Gerry Creager]

Most of these, that I've played with, use a gold foil RH sensor and then 
calculate dew point via either a simplified implementation of the 
partial differential equation, or via a modified table lookup.

A long time ago, when computational power was expensive, findu made the 
decision to do a detailed table lookup for T, RH, Pb -> Td rather than 
the complete calculation.

I'll see if I can get the real answer.  I suspect Davis is using a 
simplified form of the more complex equation.  I suspect I would.

gerry

Philip Gladstone wrote:
> 
> 
> Evan Bookbinder wrote:
> 
>> Does anyone know how the Davis Vantage Pro 2 measures the outdoor 
>> dwpt/humidity?
> 
> 
> Some of the commercial sensors actually measure RH directly using an IC 
> sensor. This is then converted to dewpoint using the standard formula 
> (given temperature).
> 
> Philip
> 
> 
> ------------------------------------------------------------------------
> 
> _______________________________________________
> wxqc mailing list
> wxqc at lists.gladstonefamily.net
> http://pond1.gladstonefamily.net:8080/mailman/listinfo/wxqc
> 
> The contents of this message are the responsibility of the author.

-- 
Gerry Creager -- gerry.creager at tamu.edu
Texas Mesonet -- AATLT, Texas A&M University	
Cell: 979.229.5301 Office: 979.458.4020  FAX 979.862.3983
MAIL:  AATLT, 3139 TAMU
Physical: 1700 Research Parkway, Suite 160,
College Station, TX 77843-3139