The error of pneumatic measuring device includes the position error of pneumatic probe, the size error of measuring nozzle and the nonlinear error of measuring device.
    1.Pneumatic probe position error
    The position error of the pneumatic probe refers to the error caused by the position error of the probe itself, the installation error of the probe and other reasons that the measured dimension line does not coincide with the measuring line of the instrument.
    2.Measuring nozzle size error
    The dimensional error of the measuring nozzle refers to the error of the instrument indicating value caused by the deviation of the inner diameter and subsidence of the measuring nozzle from the ideal size. The size error not only varies with the size of nozzle diameter and dip deviation, but also depends on the relative position of probe and measuring position.
    3.The nonlinear error of the measuring device
    The measuring device is treated according to the nozzle baffle mechanism. However, when the measuring device needs to use a throttling mechanism(Such as small hole measuring device, cone and spherical measuring device)It is shown that the aerodynamic measurement characteristic equation will produce errors, which are caused by the nonlinear characteristics of the measuring device.

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