I found this at our forum.

J question whether the area 214 or 240 cm2

I'll be more on the subject in 2010. Did the calibration raingauge Davis Vantage Pro 2 I count all the newly found and that your calibration and instructions were not very inaccurate. Begin by order. We know that the engagement surface raingauge Davis 240 cm2 precisely 240.52 cm2. First, calculate the how much should be "ml" of water to reach 1 mm of precipitation relative to the catchment area of 240.52 square centimeters. Radius receiving area raingauge is 8.75 cm, so we'll have some výslodok for "x" to "x" is the result of many "ml" of water required to reach 1 mm of rainfall. So x = 3.14159 * 8,75_2 = 240.52, we divide the 10-Timi and the result is 24.0 ml, ie x = 24.0 ml - tolkoto water should be 1 mm of rain. Thus, the logic should be 0.2 mm 5x less ie 24/5 = 4.8 ml = 0.2 mm = 1 flip. If the claim by

http://www.novapec.cz from Aug 19. 2010 a report and the 544 ml. should nerovanlo but only 25.4 mm 23.6 mm. As well as to the proportion of seats, ie 544 ml = 25.4 mm so the engagement surface raingauge 240.52 cm2 but not just 214.08 cm2, however, as I wrote at the beginning, we all know that it is not so. This implies that you just slashed by + 6% and I think that is not a negligible number.

I'm station DAVIS calibrated in the summer and I put only 500 ml of water, according to the equation would equal 20.8 mm rainfall respectively. 104 tilting. In September came the big test when the present station napršalo 26.4 mm from analogue and varied tolerance of 1% is not around for me a huge success.