There have been 'many' discussions about your question on the various optical sensors and reported measurements on the WeatherFlow forums. Far too many nuances there to reiterate here. They answered all the questions you asked above.
All the WF sensor data is basically the same as you'd expect. There are sensors that put out a signal. They convert it to a value. Sometimes there's some math involved based on how your gear is tuned, or located lat/lon, etc. There has been great 'religious view' type discussions there about sensors vs. reported values and how the reported values are derived. I try not to get into those threads, as I trust the vendor to know what they're doing. They kinda do this stuff large-scale for big companies and governments etc. on their many thousand dollar gear. I did reverse engineer one pair of measurements, I forget which, and found that it seemed the default was a simple multiplier. A few hours of research pointed me back at the reference documentation from NWS or the like that they derived their formula from. But they 'do' salt to taste via their CL algorithms, so you can't assume that an initial (untuned) multiplier is what they're using after your station has been up long enough to get tuned by them (which they do not reveal to us). Regardless, search the WF forums. The specific things you've asked have been asked+answered there with lots of detail. -- You received this message because you are subscribed to the Google Groups "weewx-user" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/weewx-user/495f0c3b-3713-4cd2-9454-714f60f1d66b%40googlegroups.com.
