By means of the principle of measuring velocity of incremental encoder, this paper analyzed many factors which cause the measuring error and the width error of pulse.

The influence of random position error of zones,width error of zones,interdiffusion and roughness on the efficiency and resolution of X-ray zone plates(ZP) is analyzed by adding the analytic expression of the diffraction field of every ring.

Analysis of linear error of magnetoelectric phase difference type torque rotate speed transducer;

The linear error compensation of the resistance respond senor with the polynomial mathematic model is investigated The mathematic compensation model is established, and the error of the simulation vale to the sample is less than 0 02% by 4 times power polynomial, the simulating precision is high The difference between calculation result and actual data is very little after compensatio

This paper introduces the programme for processing the linear error data of the torquemeter with C language,and points out that the computed result of the programme is accurate and can avoid the faults caused by the manual calculation.

The theoretical errors between the beeline method and the design equation were calculated by using Matlab mathematic software,the error curve was drawn,the errors between two design methods were analyzed and discussed.

It is to measure error and error curve of gear′s major specifications, using modularized designing soft ware system and gear′s composition measuring instrument of computer controlling.

The optimum scheme of steering trapezium of four-wheel vehicle is investigated, the steering trapezium is optimized by using three kinds of optimum schemes, a parametric optimum program is developed, the approximation error curves of various schemes is put forward, the optimum results are compared.