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 Post subject: Pressure drift
PostPosted: Tue Jan 17, 2012 5:14 pm 
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Joined: Thu Jan 07, 2010 9:44 pm
Posts: 2506
Location: Wilmslow, Cheshire, UK
Weather Station: Davis VP2
Operating System: XP SP3, Win 7
Oh dear, my pressure sensor has been giving a freaky absolute reading for some time, but putting a big offset in Cumulus.ini has been fine. But over the last couple of weeks it seems to have developed a drift against Rays Davis. I added 0.5hPa via the Cumulus calibration screen (so I do not have to stop/restart Cumulus) last Friday, now it looks like it is nearly 1hPa low again.

I've not seen other people reporting drift before, is it just my FO?

It's looking increasingly like I need to start saving for a Davis :cry:

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 Post subject: Re: Pressure drift
PostPosted: Tue Jan 17, 2012 9:04 pm 
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Joined: Mon May 30, 2011 1:34 pm
Posts: 43
Location: newtownards, N.I.
Weather Station: WH3080
Operating System: Win XP sp3
console batteries good, contacts clean?


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 Post subject: Re: Pressure drift
PostPosted: Tue Jan 17, 2012 9:26 pm 
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Joined: Thu Jan 07, 2010 9:44 pm
Posts: 2506
Location: Wilmslow, Cheshire, UK
Weather Station: Davis VP2
Operating System: XP SP3, Win 7
Thanks, but it runs off USB power 24x7

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 Post subject: Re: Pressure drift
PostPosted: Wed Jan 18, 2012 7:24 am 
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Joined: Mon May 30, 2011 1:34 pm
Posts: 43
Location: newtownards, N.I.
Weather Station: WH3080
Operating System: Win XP sp3
might be worth putting a voltmeter on the 5v rail of the PC before condemning the console, then.


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 Post subject: Re: Pressure drift
PostPosted: Wed Jan 18, 2012 9:02 am 
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Joined: Thu Jan 07, 2010 9:44 pm
Posts: 2506
Location: Wilmslow, Cheshire, UK
Weather Station: Davis VP2
Operating System: XP SP3, Win 7
It seems to be converging again now. The drift wasn't big this time, but I'll keep an eye on it.

Won't the console have a 3V internal voltage regulator though? In which case fluctuations in the USB 5V supply shouldn't matter.

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 Post subject: Re: Pressure drift
PostPosted: Fri Jan 20, 2012 2:37 am 
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Joined: Mon Dec 20, 2010 12:12 pm
Posts: 446
Location: Palmerston, NT, Australia
Weather Station: WS-1081 with rain gauge mod
Operating System: Windows 7 & 1.9.3 b1059
Hey Mark, I get the same. Probably every month I need to calibrate it in Cumulus. Around 1hPa every time. My station keeps reading lower and lower and have to add in Cumulus. I'm OK with that, but feel eventually it's going to die. :(

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 Post subject: Re: Pressure drift
PostPosted: Sat Jan 21, 2012 4:49 am 
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Joined: Mon Dec 20, 2010 12:12 pm
Posts: 446
Location: Palmerston, NT, Australia
Weather Station: WS-1081 with rain gauge mod
Operating System: Windows 7 & 1.9.3 b1059
Calibration was at +4.5hPa, have just added another 1.3hPa. I think I'll start noting when I apply these changes. :roll:

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 Post subject: Re: Pressure drift
PostPosted: Sat Jan 21, 2012 9:25 am 
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Joined: Thu Jan 07, 2010 9:44 pm
Posts: 2506
Location: Wilmslow, Cheshire, UK
Weather Station: Davis VP2
Operating System: XP SP3, Win 7
Mine seems to have stabilised again after that 0.5hPa correction.

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 Post subject: Re: Pressure drift
PostPosted: Sat Jan 21, 2012 9:51 am 
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Joined: Mon Dec 20, 2010 12:12 pm
Posts: 446
Location: Palmerston, NT, Australia
Weather Station: WS-1081 with rain gauge mod
Operating System: Windows 7 & 1.9.3 b1059
It's never a sudden jump, it happens really slowly that you don't know it's happened until you do a check.

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 Post subject: Re: Pressure drift
PostPosted: Sat Jan 21, 2012 2:08 pm 
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Joined: Fri Jun 03, 2011 2:58 am
Posts: 57
Location: Ballston Lake New York
Weather Station: F/O
Operating System: XP SP4
I've put the calibration offset into the console directly. It went haywire when my computer received a Windows update and it locked up and was dead for 2 days. Coincidence? Not sure. Fail over from USB power to batteries? Brand new Duracells that hardly ever been used - always plugged in to USB.

Tracks along nicely now with the local airport pressure.

Scott

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