Pneumatic measurement condition error mainly includes: standard ring gauge error, reading error and measuring temperature error.
    1.Standard ring gauge error
    Pneumatic measurement is a kind of comparative measurement, the error of standard ring gauge will directly affect the accuracy of pneumatic measurement. The error of the standard ring gauge is determined by the limit error of the method used to verify the standard ring gauge, which can be obtained by verifying the ring gauge.
    2.Measurement reading error
    The reading error is the error caused by the deviation of the reading effect of the indicated value. It is a random variable, and its size is difficult to be calculated by specific formulas. Most of them are selected by empirical formulas.
    3.Measurement temperature error
    The temperature error of pneumatic measurement consists of two parts, that is, the temperature error of the standard part and the temperature error of the measured part.

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