[Weather] conversion help

[Matt]

I took down my rain gauge over the weekend and ran 2 liters of water through
it.
It registered 385 tips.
The collection aperture is 5.5cm x 12.5cm

So that 5.2 ml per tip for an area of 68.75cm

How do I figure out how many mm rainfall 1 tip is ?

Thanks

-----Original Message-----
From: weather-bounces+mjoyce=iinet.net.au at buoy.com
[mailto:weather-bounces+mjoyce=iinet.net.au at buoy.com] On Behalf Of C. Dennis
Jones
Sent: Friday, 17 November 2006 5:16 AM
To: 'List for 1 Wire Weather Stations and devices'
Subject: Re: [Weather] conversion help

The area of the collector opening DOES affect calibration.  Think about any
straight sided bucket or vessel.  1" of rainfall is 1" deep in any size
vessel whether it's a test tube or a swimming pool.

Certainly not the same volume of water.  So calibration would be necessary
by ratioing the area of the openings for a known volume of water (tips of
the bucket.)

Dennis

-----Original Message-----
From: weather-bounces+dennisj=universaldata.com at buoy.com
[mailto:weather-bounces+dennisj=universaldata.com at buoy.com] On Behalf Of
Bitson Tim
Sent: Thursday, November 16, 2006 12:42 PM
To: List for 1 Wire Weather Stations and devices
Subject: Re: [Weather] conversion help

Steinar,

I'm not sure opening the orifice changes the calibration. The tipping  
buckets still measure the same amount of water, they just fill faster.

Tim Bitson
Weather Toys - The Book
http://www.weathertoys.net


On Nov 16, 2006, at 8:34 AM, Steinar Midtskogen wrote:

> [Bitson Tim]
>
>> How odd. I just opened up my LaCrosse rain gauge I got from AAG -
>> you're right! It doesn't have any adjusts either. I never used this
>> one so I didn't notice before.
>> Since the count is low, you could try to "shim" the stops to increase
>> the count. On mine, there is a flat plastic piece that the tipper
>> hits on both sides. If you raise that a bit, the tipper doesn't
>> travel as far and may tip easier (giving you more tips for the same
>> amount of water). What comes to mind is a long screw attached to the
>> base with back-to-back nuts. The head of the screw hits the bottom of
>> the bottom of the tipper about where the plastic stop is. Adjust the
>> screw up and  see if the counts increase.
>
> A better way is to increase the orifice.  I did this by using a petrol
> funnel leading into the LaCrosse.  I have a description how it may be
> done here:
>
>  http://voksenlia.net/met/prec.php
>
> -- 
> Steinar
>
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