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    BMP Datasheet accuracy

    BMP Datasheet accuracy

    user2
    New Poster

    Hello,

    I have a question about the "Relative pressure accuracy" value in BMP280 and BMP581 datasheets.  The value is given in +- Pascal.

    Can someone give some information on the percentage of measurement values that fall within that range? Is it like a 3-, 4- or 5-sigma range?

    Thank you in advance!

    3 REPLIES 3

    BSTRobin
    Community Moderator
    Community Moderator

    Hi user2,

    The indicator for measuring relative accuracy is not a percentage, its unit is Pa.
    Relative accuracy means the maximum error when you travel from one height to the other height.

    Hi,

    thank you for the answer. 

    Is there any information about the statistical variance / standard deviation of the measurement? In real measurements no value comes even close to being +- 6 Pa off, usually it's like +- 1-2 Pa, so the sensor seems much more reliable most of the time.

    I was looking for a statistical information like "68 % (1 sigma) of measurements have an error of +- 2 Pa or less" or "95 % of values (2 sigma) have an error of +- 4 Pa or less" because the maximum error of 6 Pa is way bigger than the average error I see in measurements.

     

    Thank you in advance!

    BSTRobin
    Community Moderator
    Community Moderator

    Hi user2,

     

    ±6 Pa is a typical value, as described in the data sheet.

    You can refer to the public document. If the public document does not describe the information you need, you can contact our official distributor and sales representative to apply for the information you need with providing your project information and signed NDA.

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