GB/T 20485.32-2021 Methods for the calibration of vibration and shock transducers—Part 32:Resonance testing—Testing the frequency and the phase response of accelerometers by means of shock excitation

Scope

This part of GB/T 20485 specifies in detail the instruments and procedures for testing the frequency and phase response of accelerometers using impact excitation.
This part is applicable to piezoelectric, piezoresistive, and variable capacitance accelerometers with a damping ratio less than 1, with a frequency range up to 150 kHz.
The accelerometers tested by this method must have excellent mechanical installation characteristics as stated in ISO 5348, and the reference impact ball mass must be at least three times greater than the mass of the accelerometer being tested.
The phase response of the accelerometers tested by this method assumes that there is zero phase shift between the input and output signals of the accelerometer at a frequency of 0 Hz.
Note 1: Users may notice that the frequency and phase response of the same accelerometer used in the field may vary, depending on the quality, consistency, and installation method of the test structure. This method can only provide a qualitative evaluation of the frequency and phase response of the accelerometer.
Note 2: Compared to focusing on sufficient dynamic range characteristics, users may pay less attention to obtaining a better resolution of the initial part of the frequency and phase response of the accelerometer being tested. The greatest advantage of obtaining the frequency and phase response of the accelerometer by this method is to obtain the best number of spectral lines in the initial part of the above-mentioned characteristics.

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