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Error in downloading wind gust from Instromet datalogger

Discussion and questions about Cumulus weather station software version 1. This section is the main place to get help with Cumulus 1 software developed by Steve Loft that ceased development in November 2014.
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northantsweather
Posts: 26
Joined: Thu 14 Jul 2016 6:08 pm
Weather Station: Instromet
Operating System: Windows 7
Location: Pitsford
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Error in downloading wind gust from Instromet datalogger

Post by northantsweather »

I notice that when Cumulus downloads data from the Instromet datalogger, the maximum wind gust values are less than the average wind speed values. There is no problem when Cumulus is running live, only when it needs to download archive data.

Is this a Cumulus problem, or a datalogger problem?

The attached graph shows the mismatch between wind gusts and wind speed.
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steve
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Re: Error in downloading wind gust from Instromet datalogger

Post by steve »

It's presumably because of the lack of data points for calculating the average (if Cumulus is calculating it). Do you have Cumulus set to calculate the average speed, and if so, do you have it set to use the 'speed'' for the average calculation? What is your station's logging interval (looks to be 10 minutes)?

The relevant diags file would show the figures used for the wind speeds.
Steve
northantsweather
Posts: 26
Joined: Thu 14 Jul 2016 6:08 pm
Weather Station: Instromet
Operating System: Windows 7
Location: Pitsford
Contact:

Re: Error in downloading wind gust from Instromet datalogger

Post by northantsweather »

Hi Steve

Yes, Cumulus is set to calculate the average speed. Do you suggest I uncheck this? The logging interval is 10 minutes.

Mike
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steve
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Joined: Mon 02 Jun 2008 6:49 pm
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Re: Error in downloading wind gust from Instromet datalogger

Post by steve »

I think you will get better results using logger data if you use the average calculated by the station.
Steve
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