Here is how to calibrate a Rain Gauge of any description.
https://www.meteocercal.info/forum/Threa...07#pid2607
and here:
https://www.meteocercal.info/forum/Threa...alibration
The simplest and best way to do this is to measure the cross sectional area of the rain collector of your gauge and then do the arithmetic and calibration outlined in posts above. It is unlikely to be 1mm per tip. Most gauges run between FO gauges at .280mm/tip to Davis and a multitude of others at at 0.254 and 0.200 mm per tip depending on the buckets used. The amount of water in the bucket at the point of tip is related to the amount of rainfall only through the maths in the links above.
Interesting numbers 1mm of rain over 1 sq.metre = 1 litre of water, and 1mm rain over a hectare = 10 cubic m. of water.
https://www.meteocercal.info/forum/Threa...07#pid2607
and here:
https://www.meteocercal.info/forum/Threa...alibration
The simplest and best way to do this is to measure the cross sectional area of the rain collector of your gauge and then do the arithmetic and calibration outlined in posts above. It is unlikely to be 1mm per tip. Most gauges run between FO gauges at .280mm/tip to Davis and a multitude of others at at 0.254 and 0.200 mm per tip depending on the buckets used. The amount of water in the bucket at the point of tip is related to the amount of rainfall only through the maths in the links above.
Interesting numbers 1mm of rain over 1 sq.metre = 1 litre of water, and 1mm rain over a hectare = 10 cubic m. of water.