High resolution display 06058 pressure calibration

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  • Updated 2 months ago
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Barometric pressure needs to be adjusted for station elevation. I am at about 175' above MSL.  Local airport about 2 miles away shows pressure at 30.06 mmHg, but I can only calibrate mine +0.1 mmHg upward giving a reading of 29.87.  A little wider adjustment range would be nice.  Certainly not a professional weather station but it is what it is.  Guess the trend is more what you are interested in.
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Miwalk

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Posted 4 months ago

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AcuRite Rachell, Employee

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Hello Miwak,

If your barometric pressure is reading inaccurately, we would recommend restarting your learning mode.  To restart your learning mode, enter display menu by pressing the gear button all the way on the left then arrow down to Factory Reset in the Menu settings. Change the next option to "YES" then the display will tell you to press the "Check mark" twice. Please let us know if this issue continues. Thank you. 
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Miwalk

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That helped.  Had to calibrate -0.10 this time but it is right on now. I'll check it for a few days and see how it compares.
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Miwalk

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If it can be off by +/- 0.15, then the calibration range should be at least +/- 0.15. 
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AcuRite Jennifer, Employee

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Hello Miwalk,

The display will only let you calibrate +/- 10.  It is the way the product was designed. What is your pressure currently reading without calibrations once the learning mode is complete, and what do you think it should be reading?
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Miwalk

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My pressure reading is 30.07 with no calibration offset.  With max calibration offset of +0.10 it shows 30.17.  Pressure at the airport 2 miles away is 30.22.  Therefore it is has been 0.05 consistently low with maximum calibration offset.  I realize it is designed for a maximum offset of +/- 0.10.  Seems like a poor design if the sensor tolerance is +/-0.15 and a calibration range of +/-0.10 won't cover the tolerance range.
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George D. Nincehelser

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Actually, that's not the tolerance of the sensor.  It's just what Acurite is going to guarantee for their digital barometer products in general.  The actual hardware sensor tolerance is going to be tighter than that, and the actual hardware sensor itself may vary from model to model.

The calibration is actually there to compensate for what statistical error there might be from the "learning period" algorithm.  If you re-started the learning period, chances are you'll fall better within the calibration limits they chose.

Acurite used to publish the formula used for the "learning period" in their early spec sheets.  Unfortunately I don't have one handy.  The formula is interesting in that it actually eliminates any consistent error due to the hardware itself... that kind of error washes out in the math.

What "error" you are left with is generally due to unusual pressure patterns that didn't happen to average out over the 33-day period.  Typically 33 days is good enough, but if you happened to be locked into a extended high or low period, it could throw off the calculated average.  I suppose hurricane season could also throw off the average, too.
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Miwalk

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I appreciate the information.  Doesn't really tell me much.  I haven't seen any unusual pressure patterns since I restarted the learning mode, but guess some could have occurred. Hurricane season is over so there haven't been any hurricanes or extreme lows that I have seen.   I guess I'll just accept the fact that it is always 0.05 low and live with it since that has been very consistent.  Seems like if Acurite guarantees +/- 0.15 they would have made the calibration range +/- 0.15 to compensate.