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confused regards pressure readings!

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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dane
Posts: 417
Joined: Wed 10 Sep 2008 2:15 pm
Weather Station: Rosenborg 68700
Operating System: Win10 Ult., 64-bit, RaspberryPi
Location: Gilleleje, Denmark

Re: confused regards pressure readings!

Post by dane »

If you take a look at one of the files in the Cumulus Diags folder (any text editor will do) you will probably find a line like the one below showing you the pressure values used by Cumulus (and any offsets you have applied).
Udklip.PNG
Ib
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RCE
Posts: 106
Joined: Sat 26 Dec 2009 7:59 am
Weather Station: WH1080
Operating System: Vista
Location: Sheffield UK

Re: confused regards pressure readings!

Post by RCE »

Could the confusion come from the adjustment of the 1081 internally using Easyweather and the adjustment in Cumulus (assuming similar to operation of 1080 model).

Try opening Easyweather and go to System/Setup, at the bottom is absolute pressure (can not be changed) and relative which can be changed. This allows you to enter the corrected pressure (the differential between absolute and relative will always be the value you enter in the relative data entry box minus the value of absolute when you click save).

I have found the easiest way to use the system is to first do a near enough correction in Easyweather, then do any fine trimming in Cumulus.

Hope that makes sense.
====
Alan
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RCE
Posts: 106
Joined: Sat 26 Dec 2009 7:59 am
Weather Station: WH1080
Operating System: Vista
Location: Sheffield UK

Re: confused regards pressure readings!

Post by RCE »

Oh and the 1080 can display either Absolute or Relative to change it touch the pressure reading then use the + or - button to change between abs or rel.
====
Alan
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steve
Cumulus Author
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Joined: Mon 02 Jun 2008 6:49 pm
Weather Station: None
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Location: Vienne, France
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Re: confused regards pressure readings!

Post by steve »

One possibility is that you hitting this problem: http://wiki.sandaysoft.com/index.php?ti ... et_console

You can check this in the diags folder as Ib suggests.
Steve
peter_randle
Posts: 2
Joined: Sat 12 Dec 2009 3:47 pm
Weather Station: WH1080
Operating System: Windows XP SP3

Re: confused regards pressure readings!

Post by peter_randle »

Hi there

I wrote to AWEKAS yesterday asking them how they made their decisions but in the meantime saw the Data Quality control pages used by AWEKAS for each PWS. http://www.awekas.at/de/qualcheck.php?art=baro&id=6186 This is my page for Air Pressure. A green line is used for the average of the nearby PWS air pressures and the blue line for my own station's air pressure. The difference is monitored and emails sent if this difference becomes "too great".

Kind regards,

Peter
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steve
Cumulus Author
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Re: confused regards pressure readings!

Post by steve »

They only allow you to be 0.6 hPa from the average? I'm not sure the Fine Offset stations are up to that level of accuracy. But I suppose it depends on who they're comparing you with - only 2 other stations, it seems, and both of those are using a VP2?
Steve
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steve
Cumulus Author
Posts: 26672
Joined: Mon 02 Jun 2008 6:49 pm
Weather Station: None
Operating System: None
Location: Vienne, France
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Re: confused regards pressure readings!

Post by steve »

steve wrote:They only allow you to be 0.6 hPa from the average?
Maybe not - I think I misunderstood the 'maximum' label.
Steve
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