A general precision testing scheme for electric parameters and its realization

The measurement equipment provides basis for relay protection and controls, so it is crucial to ensure the measuring precision. A digital and analog mixed test scheme based on a computerized model and signal generator has been designed in this paper, the test scheme uses the simulation software to produce kinds of test signals, then transfers them to analog signals meeting the requirement of the device under test, then compares the measurements with the inputs, analyzes the measurement precision under many kind of conditions. Then some examples are given to improve the test scheme operable. In conclusion, the test scheme is a multiple parameters test plan for the general electrical devices, it has so many advantages, such as higher precision, good flexibility, easy modification, good versatility and so on. Also it makes all the measuring precision tests easy, and the test workload to be reduced significantly.