thanks for the comments. I will be digesting all of the replies and CWOP data and coming up with a cal plan.
"[email protected]" <[email protected]> writes: > For a Davis VP2, SLP is already calculated for you in the console so all > you need is the elevation of your sensor. Hwever you still need to check if > your barometric sensor is accurate or not, Agreed. > The BMP280, BME680 are accurate > to 1 hPa and so is the VP2 barometric sensor. The newer Bosch barometric > sensor (BMP390) is accrate to 0.5 hPa. My data so far indicates that a BME280 and a BME680. BME680 is +2.4 hPa from VP2. BME280 is +1.4 hPa from VP2 Brunton ADC is -0.1 hPa from VP2. So I don't believe those claimed accuracies. I am tentatively believing that VP2 and Brunton ADC are correct until I can take the ADC to visit other barometers. > You could calibrate your VP2 with the higher spec BMP390. Just match the > pressures and you are done! or alternatively you can match Altimeter with a > close-by METAR. I am going to try to compare my barometric and altimeter pressures with NWS stations on a day with a low rate of change. > So no, we will not be achieving 0.05 to .10 hPa accuracy WMO standards with > our consumer grade personal weather stations! VP2 seems pretty stable so I think 0.2 hPa is not crazy. > Keep in mind that different countries use different pressures. Most > countries don't use SLP or Altimeter - they use QNH in whole integer > amounts which makes matching difficult as you would have to match 1013, > 1014, 1015, etc. If you luck out, some countries publish decimal QNH like > the BOM in Australia. I thought QNH was Altimeter. The US uses that in aviation and SLP or barometric pressure for weather. But yes, roudning to whole hPa makes it hard. -- 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/rmiv8tjymtu.fsf%40s1.lexort.com.
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