Abstract:A method and definition to evaluate the dynamic accuracy of data acquisition system is introduced in this paper. By the curve fitting method, the effective bits, the errors of offset, the errors of gain are evaluated. The dynamic accuracy of data acquisition system is determined finally. Accuracy results using the method in test are given in the end.

Abstract:This paper proposes a new method for studying the single valley characteristic of the cylindricity objective function which is seldom studied up to now. It is very important to computing its extreme value correctly by optimization principle to make sure that a cylindricity objective function is a single valley one or not. By means of a computer, we can rapidly determine whether any cylindricity objective function is a single valley one or not by the method proposed in the paper. Therefore, the problem which is very difficult to solve by pure mathematical method is solved.

Abstract:The operational principle, the kinds and the error characteristics for the volumetypeflowmeter are described. An effect of a differential pressure and fluid on error characteristics is analyzedand discussed, and the computational formula is given. At last, in order to attain the precision values, itmust be necessary for indicated values of its temperature and pressure to be corrected.

Abstract:A new method, which adopts "Rolling Raster" as a length standard, takes aim at the scale mark via a microscope and directly verifies the scale intervals of a measurand steel tape, is introduced and the errors are analyzed briefly.

Abstract:不合格测量设备的处置是测量设备确认体系要素之一，在贯标中应建立相应的不合格测量设备处置管理程序，以实现对不合格测量设备进行有效的控制。