If you truly believe that your tipping gauge is inaccurate, why not just use the StdCalibrate <http://weewx.com/docs/usersguide.htm#StdCalibrate> facility? That's what it's there for.
How much of an error are we talking about? -tk On Mon, Sep 18, 2017 at 10:56 PM, Andrew Milner <[email protected] > wrote: > 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 <[email protected]> > *Sent: *19 September 2017 08:49 > *To: *weewx-user <[email protected]> > *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. > -- 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.
