Hi, Not sure why Google took so long, but I've only just come across this forum after quite a while of searching. Compared to other sites I've tried there also seems to be a fair number of pundits around so I'm hopeful I might get further with my queries this time!
I acquired a VP2 kit a few months back and have had some questions about the sun sensor ever since, but I'll start with just a couple of simple ones to do with the archived sun sensor data (WeatherLink). The documentation says that for the temperature sensor (with archive intervals <= 10 mins) the samples are taken every 5 secs and averaged over the required archive interval. It also says the sun sensor data are averaged (if averaging is selected), but as far as I can see gives no further details about sampling rate.
I am using an archive interval of 1 minute and was intrigued by the archived sun sensor data when compared to the console values. The latter are described as the "current value" in the documentation and can indeed be seen to change in a matter of seconds if the irradiance is changing rapidly. I would therefore have expected the archive data to be an average over the archive interval. However, that seems not to be the case and the archived value is simply the sensor reading at the one-minute time-stamp (see attached plot - particularly the 11:30 - 11:31 interval). For longer archive intervals it may well average over the "on the minute" values and that definition of averaging would of course also fit my one-minute archive - except I suggest an average of one value is not making full use of the data! Is this interpretation of what the software is doing correct?
Also as a supplementary question - when and if it averages the 5-sec temperature data samples correctly to what interval does a one-minute archive interval time-stamped for example as 08:01 refer? Is it
08:00:00 - 08:01:00
08:00:30 - 08:01:30 or
08:01:00 - 08:02:00 or none of these?!
PS apologies if the plot is not inserted or attached but I can't seem to get any indication from the message composing page, even in preview mode, that anything has happened or been accepted when I select an image to attach.