his paper introduced a simple resistance testing instrument of automatic measurement of the composition, working principle and Realization process. The design of 100Ω、1KΩ、10kΩthree gear range automatic transmission, using AT89C51 MCU control tester were achieved in the three range resistance automatic measurement.
In the simple resistance meter, we achieve the target of switching range automatic and selecting the range of the resistance meter through the resistor .Measurement result which is sampled by A/D is controlled by microprocessor, and finally the resistor is displayed on the LCD screen. The experiment prove that the system has a certain practical value because of it has a simple structure and perform stable and it measure resistor more accurate .
Key words： single chip microcomputer; resistance tester; A/D sampling；Automatic range switching
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