Research on measuring instruments classified

This paper develops the classifying method of measuring instruments in indication type and material measure before.A suggestion that measuring instruments are classified to the types of providing quantities and measuring quantities is propounded.The first type of measuring instruments reproduces or offers certain signals corresponding the nominal values, and the other type of measuring instruments indicates the values of input signals.The author attempts to classify the instrument for difference subjects in essentially.The idea about four kinds of calibration method is educed.The opinion that deviation should be use to characterize the measuring instruments of providing quantities and error of indication should be use to characterize the type of measuring quantities is suggested.