When the measuring power of the air momentum meter changes and the indicating value is unstable, it should be adjusted as follows:
    1, magnification nailOThe ring is worn and needs to be replacedOType rubber ring;
    2The end face of the thimble is worn and dented, and the chromium oxide is ground on the grinding plate, and the flatness of the thimble is checked with a knife edge flat rule0.002μm;
    3The measuring head wear causes the magnification to decrease, and the measuring head should be replaced;
    4The lock nut and the magnification nail are adjusted to the appropriate position to achieve no obvious movement and swing.

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