I still have not fully understood all that you have done!!

a.  You have added a dictionary definition to say that Extra3 is a 
radiation field.

what process/service is reading the radiation which has been ftpd from 
elsewhere into weewx?  Do you have a service which is reading a file and 
does it add the data to loop or record packets - or are you doing something 
else to get the data into weewx??

where is the calculation put - is it in calibration, in the reading 
service, or where??

Sorry - but you appear to be very short on detail (or I am totally 
misunderstanding)!!!  Maybe it would be useful for you to give original 
radiation value, ftp'd value, value put into loop/record packet, value in 
Extra3 field of database.



On Thursday, 26 April 2018 09:08:32 UTC+3, Jan Commandeur wrote:

> In extensions.py I add the line :   
> weewx.units.obs_group_dict['Extra3']            = 'group_radiation'   # sun 
> warming up 1 sqr meter in 1/12 hour
>
> so I made a calculation:  zon5min = radiation / 12
>
> radiation is from a second weatherstation and with ftp send to the server.
> When I looks to the radiation also with ftp send to the server, that are 
> right numbers.
> these numbers are, if it is sunny weather, equal to maxsolarrad.
>
>
> Op woensdag 25 april 2018 21:18:28 UTC+2 schreef Jan Commandeur:
>>
>> I add nubers to the weewx_mysql database with       
>> event.record['Extra3']            = zon5min
>>
>> When I look some later to the numbers in the database, then they are 
>> different from the input.
>> How can this be caused.
>>
>> Jan Commandeur
>>
>

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