Rainfall calibration factor.

[dc1500]

It's ok Steve - I don't need a change! Just wondered if the calibration factor is simply applied to each 0.3mm tip and then rounded to nearest 0.1mm and then added to running total. It's just that I have now got quite a good correlation with my standard rain gauge. Unfortunately it's about 0.85 which makes 0.3 = 0.258mm which would be rounded back to 0.3 and thus have no effect, if that's how it works.
Dave C

[steve]

The calibration factor is applied to the running total, not individual tips. All of the rainfall figures are calculated from the total number of tips recorded by the station since it was reset (or possibly since the start of the year, if that was earlier than the last reset). For the sake of argument, let's say it's the total this year. The total this year is multiplied by 0.3 to get a total in mm. This is then converted to inches if necessary by multiplying by 0.0393700787. The calibration multiplier is then applied to this, and this is the figure that Cumulus remembers and compares each time a new total is read from the station.

When it's displayed, or written to log files, it's rounded to 1 decimal place (for mm, 2 for inches).

So, with your multiplier of 0.85, 1 tip would come out as 0.3, but 2 tips would come out as 0.5. That's the theory, anyway.

Steve

[dc1500]

Thank you Steve. That's good news.
Dave