The Research Of Intelligent Test Instrument Of Small Electric Resistance

Research on intelligent measurement of small electric resistance belong to the field of condition monitoring and fault diagnosis on electric power equipment. In the process of examination and experiment of the electricity equipment, we usually run into conditions that big error between the measurement data and theories because of the neglecting the influence of the examination. We regard the contact electric resistance of measuring in the circuit as an example in the text, and discuss method of measurement of small electric resistance.Small electric resistance instrument is applied in electric power and electrical apparatus manufactory . In this thesis, One kind of new electrical power, composed of a second order oscillating circuit including a capacitance is used.A single chip computer does pulse power control , data acquisition and data processing. The intelligent measurement and conqution improve the accuracy.Four-segment connecting and standard resistance comparison methods are adopted to reduce the system error. Anti-interference measurements are used in both the software and hardware design. Moreover , instrument amplifier and analogue to digital conversion chips are used to increase the accuracy.The development trends of circuit resistance instrument are mico-miniaturization, reliability, accuracy and intelligence.