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→Cumulus read some invalid figures from my station
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== Cumulus read some invalid figures from my station ==
If you have:
*just started using Cumulus,
Over successive versions of Cumulus more and more code has been incorporated to deal with the way some stations are prone to reporting rogue readings.
*Ensure you are using the latest Cumulus build, if you are using an old version you will not have any enhancements made since the earlier build that might improve the way Cumulus reads from your station type.
In general, if Cumulus 1.x.x identifies an odd value for up to 6 times, it will reuse the last good value instead
up to 5 minutes. That is designed to be long enough for you to spot the problem and deal with it. Sometimes the problem will right itself within that time. After that time, a problem with reading temperature, humidity, wind, or pressure, means Cumulus cannot calculate derived values, the last successful read is considered too stale to reuse, and by default Cumulus will stop any further processing.
'''Fine Offset stations''' are prone to reporting the odd
*From the '''Configuration''' menu select [[Cumulus_Screenshots#Configuration_Menu_Screens|''Calibration'']] and in the '''Spike removal''' frame you can specify "the maximum '''differences''' between successive values" that Cumulus is to tolerate. See the '''Help''' for that screen, and note that spike removal applies while Cumulus is running, not to catch-up readings from the station's logger.
The purpose of the backup files is to allow Cumulus to be 'rewound' to a particular point in time. It simulates the situation where someone had closed Cumulus down at that point, and is only now starting it up again, and needs data to be downloaded from the station's logger to catch up to the present time. Obviously this cure will not work if your station type does not have a logger (one is needed for Cumulus to read old readings again).
*If you have only installed Cumulus a few days ago, or have just re-started Cumulus after it was stopped and encounter multiple ''rogue readings in the catch-up from the station logger''; '''one possibility''' is to stop Cumulus and find the [[#On_restarting_Cumulus.2C_it_did_not_successfully_read_all_data_from_when_it_last_ran|backup files]] that it took when you started it up (or just after the previous roll-over time), copy those files into the data folder, overwriting the ones that are there, then when you start it up again it will rewind back to the time in that back-up, and could sort itself out.
The Cumulus 1 [[Diags|Diagnostic]] log often contains useful information for sorting out what has been read, which values have been ignored, and which highs or lows may have been updated incorrectly. Note that automatic backups are made just after roll-over time because restarting Cumulus when there are no logger records to read before roll-over has been known to cause problems. Therefore, the backup to choose might be one with the date before when the problem
== How to restore a corrupted log file ==
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