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Pressure Measurement: Difference between revisions
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→Setting the Datum: Remove description of setting sea level pressure in cumulus, replace with setting in weather station
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==Setting the Datum== | ==Setting the Datum== | ||
All weather stations allow you to adjust the pressure for sea level. You should not make the adjustment within Cumulus. | |||
For Fine Offset see [[FAQ#Cumulus_doesn.E2.80.99t_show_the_same_pressure_as_my_Fine_Offset_console]]. | |||
The best way to get MSL pressure at your location is to go to a site like [http://www.wunderground.com/ Weather Underground] and enter your location. It will find a weather station nearby and give you the current MSL pressure. It's a good idea to choose an airport site because you can be sure that it has been accurately reduced to MSL pressure. | The best way to get MSL pressure at your location is to go to a site like [http://www.wunderground.com/ Weather Underground] and enter your location. It will find a weather station nearby and give you the current MSL pressure. It's a good idea to choose an airport site because you can be sure that it has been accurately reduced to MSL pressure. | ||
Alternatively, look at a isobar chart at a site like [http://www.meteorologica.info/UKisobars.htm weather superstore], and interpolate for your location. | |||
The best time to set your datum is when the pressure is | The best time to set your datum is when the pressure is not changing either with time or between nearby locations. Note most sites only give pressure to the nearest hPa, so you can be 0.5 hPa out if you use that, whereas most personal weather stations give pressure with 0.1 hPa precision. | ||
== Calibration == | |||
If you find that your sensor is inaccurate, it may be possible to apply a calibration within cumulus (configuration menu). | |||
==Locating the Barometer== | ==Locating the Barometer== | ||