OK, thanks. 
A good "offline" comparison of your sunshine sensor with the formula will be 
difficult, since with your archive data the fomula will produce only one 
estimation for a 5 min period, based of the archive radiation measurement , 
which is the mean radiation measured over of archive period .
When used "online", as an installed weewx extension, the evaluation is done on 
the basis of the instantaneous radiation LOOP data, and is updated as soon as a 
new radiation value is sent by the Davis radiation sensor (about every 50 
seconds). 

> Le 10 mai 2024 à 20:48, Karen K <kk4468...@gmail.com> a écrit :
> 
> The sensor sends a pulse every 36 seconds if the sun shines. 8 pulses are 288 
> seconds, 9 pulses are 324 seconds. If the sun shines continuously, sometimes 
> you get 8 pulses within one archive interval and sometimes 9. That is the 
> reason for those values. So you may add those additional 24 seconds to the 
> previous or next archive interval.

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