二阶测量装置性能评价的依据和方法的讨论

DISCUSSION ABOUT BASIS AND METHOD TO ESTIMATE THE PERFORMANCE OF SECOND ORDER MEASUREMENT INSTRUMENT

动态测量装置性能评价的依据和方法是测试技术中最基本的问题之一．文中对此问题进行讨论后指出：应将实际测量装置的幅、相频率特性和理想的无畸变测量装置的幅、相频率特性相比较作为评价的依据．在此基础上给出了二阶测量装置最佳阻尼比ζｂ的计算方法及其合适的变化范围．并指出二阶测量装置ζｂ不可大于０．７０７．

The basis and method used to estimate the performance of dynamic measurement instrument is one of the most foundamental problems of Measurement Technology, and it is discussed in this paper. It is indicated that comparison of the amplitude and phase frequency characteristics of actual measurement instruments should be conducted with ideal and non deforming ones which can be used as the estimating basis. On the basis, the calculation of the optimal damping coefficient ζ b and its appropriate changeable range to the second order measurement instruments are presented and it is indicated that theoretlically the value of ζ b can not be greater than 0 707. This basis and method could be applied to the n order dynamic measurement instruments.