The accuracy requirements of the gas gauge are very high, and the stability must also meet the standards, otherwise the measurement data will be inaccurate and affect the production standards of the workpiece. In terms of manufacturing, there are three main reasons for affecting the stability of the gas gauge:
    1The structure design is unreasonable
    The unreasonable mechanical structure design of the gas gauge is easy to cause the instability of the gauge. Its shape design is very important, first of all to consider the rigidity of the meter, if the mechanical structure rigidity is poor, once the external micro-influence, such as the foundation micro-vibration, will cause the high-precision gas momentum meter instability.
    2Component materials do not match
    The main component is the mismatch between the sensor and the control box. Because the impedance and sensitivity of different sensor materials are different, the corresponding circuit is also different. In the same way, the two secondary windings of the excitation power transformer formed by the bridge of the sensor two coils are also impossible to complete|Full symmetry. Therefore, if the sensor and the input circuit do not match the impedance, its residual voltage is very large, the nonlinear error increases, and the signal measured near the zero position is very unstable. Some manufacturers, because they do not have the conditions to do sensors, borrow others' sensors and only make simple magnification adjustments on the circuit, without making impedance matching adjustments. In this way, it seems that the whole machine can be measured, but its stability is not good.
    3The control line is unstable
    The stability of the electrical control circuit itself will directly affect the stability of the whole gas gauge. Generally, the circuit of the high-precision air momentum meter consists of the input bridge; Oscillating line; Phase sensitive detection or pulse clamped detection; It consists of four parts: filter amplification, display and record. The voltage of the oscillation line is used as the input bridge of the excitation power supply meter, and the instability of the oscillation voltage will cause the instability of the input signal.

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