The tipping bucket must be ut in a linear fashion as the only thing which can be wrong is the bucket size itself, assuming it is lubricated and moving freely. Have you ecperimented with dripping water into the gauge and measuring the number if tips for a fixed quantity of water? It must be a linear relationship as near as dammit.
Sent from my Windows 10 phone From: TheChoctlab Sent: 19 September 2017 08:49 To: weewx-user Subject: Re: [weewx-user] Re: Rain gauge errors Got it. Thank you. On Monday, September 18, 2017 at 10:48:05 PM UTC-7, Andrew Milner wrote: A single addition would work for the daily total in the daily rain table, but not fir the individual archive records in the archive table. Sent from my Windows 10 phone From: TheChoctlab Sent: 19 September 2017 08:44 To: weewx-user Subject: [weewx-user] Re: Rain gauge errors After re-reading your post, the following occurred to me: UPDATE archive SET rain = rain + yy WHERE dateTime > xxxxxxxxx; yy being the difference between the tipping bucket and manual gauges. On Monday, September 18, 2017 at 8:47:22 PM UTC-7, Andrew Milner wrote: I forgot to add 1. Take a copy of the database before manipulating/updating values 2. If you 'correct' the readings MAKE A NOTE OF THE DATE TO WHICH YOU DID THE UPDATE and then on subsequent manipulations it would be UPDATE archive SET rain = rain * 2 WHERE dateTime > xxxxxxxxx; On Tuesday, 19 September 2017 06:43:46 UTC+3, Andrew Milner wrote: Depends what you mean by 'manipulate'!! If you have a formula that would convert VP2 reading to match manual reading then the formula could be put into the calibration section of weewx. If you want to change existing readings already in the database then you can use SQLite to issue sql statements direcly eg to double all rain readings before epochdate xxxxxxxxx would be something like: UPDATE archive SET rain = rain * 2 WHERE dateTime < xxxxxxxxx; On Tuesday, 19 September 2017 06:02:13 UTC+3, TheChoctlab wrote: My VP2 rain gauge, not unlike other tipping bucket gauges, is often inaccurate. I have a Stratus RG202 manual gauge to compare it to. I understand that I will need to manipulate weewx.sdb to reflect the readings from the manual gauge. But, I am not sure what exactly to manipulate. Guidance please. -- You received this message because you are subscribed to a topic in the Google Groups "weewx-user" group. To unsubscribe from this topic, visit https://groups.google.com/d/topic/weewx-user/ygSQ1OzWV88/unsubscribe. To unsubscribe from this group and all its topics, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to a topic in the Google Groups "weewx-user" group. To unsubscribe from this topic, visit https://groups.google.com/d/topic/weewx-user/ygSQ1OzWV88/unsubscribe. To unsubscribe from this group and all its topics, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups "weewx-user" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
