Design of Simple Resistance Automatic Tester Based on STC89C52

Abstract

The automatic resistance tester selects STC89C52 as the core control chip, realizes the measurement of the resistance or potentiometer by voltammetry, then performs A/D conversion on the voltage value measured to represent the resistance value, and finally converts the digital signal completed by AD7705. Input the I/O port of STC89C52 MCU for calculation and processing, realize automatic measurement of resistance, automatic shifting and resistance screening function. At the same time, the function of the potentiometer resistance curve test can be completed. The experiment shows that the relative error of the resistance measurement based on STC89C52 automatic resistance tester is <0.5%, the screening error is <10%, and the resistance curve of potentiometer can be tested.