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 Post subject: Rain Collector Measurement
PostPosted: Thu Feb 23, 2012 11:49 am 
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Joined: Tue Jun 28, 2011 2:06 pm
Posts: 293
Location: Harwich, Essex
Weather Station: Oregon WMR-88
Operating System: Windows XP SP3,
Any La Crosse owners know what 1 tip of the rain collector measures, I have the WS-2350 model

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 Post subject: Re: Rain Collector Measurement
PostPosted: Thu Feb 23, 2012 11:56 am 
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Joined: Mon Jun 02, 2008 6:49 pm
Posts: 20341
Location: Sanday, Orkney
Weather Station: Davis VP2
Operating System: Windows Home Server 2011
It's 0.518 mm, inexplicably. It's not even the metric equivalent of a sensible imperial value: 0.02 in = 0.508 mm

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 Post subject: Re: Rain Collector Measurement
PostPosted: Thu Feb 23, 2012 12:01 pm 
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Joined: Tue Jun 28, 2011 2:06 pm
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Location: Harwich, Essex
Weather Station: Oregon WMR-88
Operating System: Windows XP SP3,
Many thanks Steve :D

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 Post subject: Re: Rain Collector Measurement
PostPosted: Tue Feb 28, 2012 12:55 pm 
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Joined: Tue Jun 28, 2011 2:06 pm
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Location: Harwich, Essex
Weather Station: Oregon WMR-88
Operating System: Windows XP SP3,
Hi Steve, Do I just put the 0.518 mm into the multiplier section?

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 Post subject: Re: Rain Collector Measurement
PostPosted: Tue Feb 28, 2012 1:58 pm 
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Joined: Mon Jun 02, 2008 6:49 pm
Posts: 20341
Location: Sanday, Orkney
Weather Station: Davis VP2
Operating System: Windows Home Server 2011
What do you want achieve by doing that? It would roughly halve your rain figures. The rain gauge tip size is not a logical figure to be using as a calibration multiplier - have you modified your gauge to make it tip with a different amount?

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 Post subject: Re: Rain Collector Measurement
PostPosted: Tue Feb 28, 2012 2:04 pm 
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Joined: Tue Jun 28, 2011 2:06 pm
Posts: 293
Location: Harwich, Essex
Weather Station: Oregon WMR-88
Operating System: Windows XP SP3,
Hi Steve, No, I have done no mods, it was just that after the last drop of rain we had the total seemed a bit low, that was why I asked what the one tip figure would be to try and get a more true figure

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 Post subject: Re: Rain Collector Measurement
PostPosted: Tue Feb 28, 2012 3:01 pm 
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Joined: Mon Dec 20, 2010 12:12 pm
Posts: 469
Location: Palmerston, NT, Australia
Weather Station: WS-1081 with rain gauge mod
Operating System: Windows 7 & 1.9.3 b1059
The tip measurement it makes is what it sends, and should be fine. This of course is only good if it is correct, and should be. But some are not Calibrated correctly or just not made fantastic. You could "guess" how much more it should be which sounds like what you are intending to do, but you'll end up more wrong than what the initial "error %" is (assuming there is one).
Best to get a good manual rain gauge. Do some comparisons over a few days of rain (fair amounts, not piddly .2mm/1.3mm etc), and find a good medium. With this "average" worked out, if there is a difference with the averages from your manual rain gauge to your weather station rain gauge, then it would be safe to put in a calibration multiplyer.
Then in the future your manual rain gauge can serve as a check to see that your WX rain gauge is still operating correctly. If you see changes, then it's time to check for spiders webs, leaves, rust, loose conections, water in conections, flat batteries etc.

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 Post subject: Re: Rain Collector Measurement
PostPosted: Tue Feb 28, 2012 3:10 pm 
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Joined: Tue Jun 28, 2011 2:06 pm
Posts: 293
Location: Harwich, Essex
Weather Station: Oregon WMR-88
Operating System: Windows XP SP3,
Thanks for that Mike, I have a proper calibrated rain guage so will check it over the next few rainfalls :D

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