moving to a new VP2 (19.5yo one is twitching in its last throes), i have taken
the opportunity to re-think everything from first principles
please check my thinking on rainRate calibration in weewx.conf[[Corrections]]:
#GE 2025-08-20 new VP2 - rain calibration.
# 500ml water sample read as 21.082mm but 23.4mm expected.
# rain reading low - normal for a new VP2.
# 'weectl device' has no way to define a gain for rain, so have to
# apply it as a Correction here
rain = rain * 1.1101
#
# the following rain-related values also come directly uncalibrated
# from VP2 so we have to apply same gain here
stormRain = stormRain * 1.1101
dayRain = dayRain * 1.1101
monthRain = monthRain * 1.1101
yearRain = yearRain * 1.1101
#
# the following can be derived in [[Calculations]] from
# Corrected rain (prefer_software) but instead we choose to take
# them uncalibrated (prefer_hardware) and apply the gain here
# for simplicity and consistency
rainRate = rainRate * 1.1101
cheers
⊣GE⊢
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