W dniu 31.08.2023 o 16:55, 'Rainer Lang' via weewx-user pisze:
to calibrate your WS-1001 (Ambient version of the FineOffset/EcowittWH24
outdoor array and the WH1080 console) you could just follow the
instructions in https://www.wxforum.net/index.php?topic=40730.0 chapter 6
determine the offset and enter it accordingly (either an offest of
change the value, whatever the console wants --> manual).
METAR, airport etc. are secondary approaches for refinements which you
may or may not want to follow. There are lengthy and complex treatises
on that topic in the same forum, from simple to highly complex.
[by the way, if you have a European or international "version" of the
Ambient WS-1001 and call this a clone version, then that's very strange
wording as Ambient is the clone and not Fine Offset/Ecowitt = the
manufacturer]
but true, weewx should come to a proper result - and unless your station
also reports wrong absolute pressure (= local pressure) - or you display
the wrong variable/observation in your skin, then something is wrong
with weewx. Rather unlikely.
Did you read the barometer topic in the weewx online documentation ?
I'm back and starting my reply from Rainer's last question. Yes, I've
read this topic:
https://github.com/weewx/weewx/wiki/Barometer,-pressure,-and-altimeter
on the very beginning. I use only 'pressure' and 'barometer' terms
below, according to definitions from wiki.
So, I'm even more confused than before. I've made the calculations with
the calculator listed in https://www.wxforum.net/index.php?topic=40730.0
(direct link: https://keisan.casio.com/exec/system/1224575267 - BTW they
will close at September 20) with my current conditions (pressure 944.5
hPa, temperature 20*C, height of sensor 560 m AMSL) and got result
1007.8 hPa - this is perfectly equal to what I see on my webpage -
1007.7 hPa calculated by Weewx algorithm (difference of 1/10th of hPa is
neglible). I recall that I use 'software' option in weewx.conf for
'barometer' but 'prefer_hardware' for 'pressure'.
But very accurate numerical forecast for my location *and* METAR for
EPWR airport shows 1015 hPa. So I need to "collect" additional ~7 hPa
(1015 from METAR minus 1007.8 from Weewx calculations). Does it mean I
should:
a) add whole calculated offset - ~70 hPa (1015 from METAR minus ~945 of
absolute pressure) - in my PWS console
or
b) add smaller offset - 63.3 hPa (1007.8 calculated by Weewx minus 944.5
read by sensor) PLUS use relevant section in weewx.conf:
# This section can adjust data using calibration expressions.
[StdCalibrate]
[[Corrections]]
# For each type, an arbitrary calibration expression can be given.
# It should be in the units defined in the StdConvert section.
# Example:
foo = foo + 0.2
to incorporate "rest" of offest (METAR value minus barometer value
calculated by Weewx):
[StdCalibrate]
[[Corrections]]
barometer = barometer + 7.2
I only need confirmation that I'm going in right direction - or opposite.
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