An interesting set of comparisons;
Lattitude 55.34o N 4.69oW
Apogee Clear Skys Model: (http://clearskycalculator.com/pyranometer.htm)
24/April/2017 Day 114 @ 12.75 hours (12hours 45minutes)
@ 12:45 hours: Max solar insolation possible 750 W/m2
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Reading from Davis Groweather 1999 model; (www.ayrshireweather.org )
@ 12:45 hrs: 781 W/m2
https://www.wunderground.com/personal-we...R8#history
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Reading from Weatherduino using Didcot Pyranometer; (www.ayrshireweather.org/weatherduino )
@12:44 Hrs 1045 W/m2.
https://www.wunderground.com/personal-we...E2#history
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I always thought the Didcot read very generously and altered the op amp gain using the potentiometer to reduce this reading. However when I did this I began to lose early morning and late evening readings altogether. The sensor does not seem to respond in a straight line to altering the op amp gain.
Any ideas??
Lattitude 55.34o N 4.69oW
Apogee Clear Skys Model: (http://clearskycalculator.com/pyranometer.htm)
24/April/2017 Day 114 @ 12.75 hours (12hours 45minutes)
@ 12:45 hours: Max solar insolation possible 750 W/m2
================================================================
Reading from Davis Groweather 1999 model; (www.ayrshireweather.org )
@ 12:45 hrs: 781 W/m2
https://www.wunderground.com/personal-we...R8#history
================================================================
Reading from Weatherduino using Didcot Pyranometer; (www.ayrshireweather.org/weatherduino )
@12:44 Hrs 1045 W/m2.
https://www.wunderground.com/personal-we...E2#history
================================================================
I always thought the Didcot read very generously and altered the op amp gain using the potentiometer to reduce this reading. However when I did this I began to lose early morning and late evening readings altogether. The sensor does not seem to respond in a straight line to altering the op amp gain.
Any ideas??