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FAQ: Difference between revisions
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→Cumulus doesn’t show the same pressure as my Fine Offset console: Minor changes to reflect diagnostics
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== Cumulus doesn’t show the same pressure as my Fine Offset console == | == Cumulus doesn’t show the same pressure as my Fine Offset console == | ||
Cumulus displays pressure corrected to sea level. The console calls this ‘relative pressure’; it displays the letters "rel" when this is being displayed. First of all, check that you are comparing the Cumulus display with the ‘relative’ pressure on your console, and that you do not have a 'EWpressureoffset=x.y' line in the [Station] section of [[Cumulus.ini#Introduced_for_problems_with_Fine_Offset_family:| cumulus.ini]]. | Cumulus displays atmospheric pressure corrected to sea level. The console calls this ‘relative pressure’; it displays the letters "rel" when this is being displayed. First of all, check | ||
# that you are comparing the Cumulus display with the ‘relative’ pressure on your console, | |||
# that only one copy of Cumulus is accessing the weather station (and no other software), | |||
# and that you do not have a 'EWpressureoffset=x.y' line in the [Station] section of [[Cumulus.ini#Introduced_for_problems_with_Fine_Offset_family:| cumulus.ini]]. | |||
The Fine Offset stations only store absolute/station pressure readings in their weather memory locations updated with each transmission and read by Cumulus. Within Cumulus, the software applies the adjustment to sea level before any further processing. It does ''not'' use the altitude setting in the cumulus station configuration screen. | The Fine Offset stations only store absolute/station pressure readings in their weather memory locations updated with each transmission and read by Cumulus. Within Cumulus, the software applies the adjustment to sea level before any further processing. It does ''not'' use the altitude setting in the cumulus station configuration screen. | ||
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The support forum includes discussion on where to find isobar charts or other sources to determine what the pressure should be. Obviously after any adjustment you need to stop Cumulus, because it is when you restart it that Cumulus reads the new pressure offset. | The support forum includes discussion on where to find isobar charts or other sources to determine what the pressure should be. Obviously after any adjustment you need to stop Cumulus, because it is when you restart it that Cumulus reads the new pressure offset. | ||
Sometimes the offset that cumulus reads from the fixed block is clearly garbage, so Cumulus uses zero instead as a best effort. In this situation, Cumulus will display the same value as the 'absolute' pressure on the console (no "rel" is displayed on the console when it is displaying absolute pressure). Often, if you restart Cumulus, it will then be able to read the correct value. If the problem happens often, you can circumvent it by editing cumulus.ini (while Cumulus is stopped), and in the [Station] section add an entry: | Sometimes the offset that cumulus reads from the fixed block is clearly garbage, so | ||
# the cumulus error light is set, | |||
# an error message suggests you check the station, and | |||
# Cumulus uses zero offset instead as a best effort. | |||
In this situation, Cumulus will display the same value as the 'absolute' pressure on the console (no "rel" is displayed on the console when it is displaying absolute pressure). Often, if you restart Cumulus, it will then be able to read the correct value. If the problem happens often, you can circumvent it by editing cumulus.ini (while Cumulus is stopped), and in the [Station] section add an entry: | |||
EWpressureoffset=x.y | EWpressureoffset=x.y | ||