Hello, If you look in the driver, you'll see this note:
Illuminance and Radiation The 30xx stations include a sensor that reports illuminance (lux). The conversion from lux to radiation is a function of the angle of the sun and altitude, but this driver uses a single multiplier as an approximation. Apparently the display on fine offset stations is incorrect. The display reports radiation with a lux-to-W/m^2 multiplier of 0.001464. Apparently Cumulus and WeatherDisplay use a multiplier of 0.0079. The multiplier for sea level with sun directly overhead is 0.01075. This driver uses the sea level multiplier of 0.01075. Use an entry in StdCalibrate to adjust this for your location and altitude. The ratio of multipliers is 0.01075 / 0.001464 or 7.34. This is the same as the ratio of the values: 93 / 12.7 = 7.32. So, the difference is entirely due to the different multipliers used. -tk On Wed, Jun 28, 2017 at 10:17 AM, Massimiliano Neri <[email protected]> wrote: > > Tom, can I ask you how to calculate solar radiation? I on the console for > example I have these three readings: > - 809 in Fc > - 8.70 in Klux > - 12.7 in W/M2 > > Why did I find the value converted to 93 W/M2? > > > Il giorno martedì 27 giugno 2017 22:34:45 UTC+2, Massimiliano Neri ha > scritto: > >> Hello... >> >> I have a FineOffset (Froggit) WH3080 connected with weewx. I would like >> to know how the software calculates the relative pressure from the absolute >> pressure. In fact I found that weewx calculates me at least 2hpa more than >> the weather stations in my area .... >> Can anyone tell me if you can take the relative pressure from the wh3080 >> console? >> > -- > You received this message because you are subscribed to the Google Groups > "weewx-user" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "weewx-user" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
