07-02-2016, 18:57
(07-02-2016, 18:56)Werk_AG Wrote: Hi Alan
Quote:Strange, I thought I'd posted a reply yesterday, but it appears to have "vanished".
I never delete a post. I will try to check what happened.
Quote:I was only confirming that I'd be looking for a "mechanical" issue. Since the fall looks to be close to 50% it could well be one (of 2) or 2 (of 4) of the PV panel diodes becoming "short-circuit" due to overheating.
I think you are right. Seems an internal failure in some of diodes.
Quote:I'm certainly not disputing that the sensor is optimised for "Ultra-Violet", just that without a UVA-blocking filter, it cannot produce a genuine "UV-Index", which is very heavily biassed (by up to 3 orders of magnitude) towards passing (only) the UVB wavelengths.
I understand your point, and obviously I agree with you. Strictly talking, as defined, the UV index is related to UVB radiation only.
Cheers, Werk_AG