摘要
Abstract
In order to realize measurement of resistors with toothful numerical value, this paper introduces a kind of simple test instrument for resistor based on STC12C5A60S2MCU. The design took STC12C5A60S2 single-chip microcomputer as the core, the DC voltage source and an operational amplifier were used to form a multivalve constant- current source, it can realize wide-range resistance measurement. The MCU internal integrated A/D converter was used to sample the voltage across the resistor. Through numerical comparing, the MCU automatically control various grades of resistor relay switch, so that automatic range switching function is realized.The keyboard was used to input the screening resistor value and the error value; through the control of MCU for stepper motor, a potentiometer resistance change was achieved. The measurement data and the changes curve were displayd by the LCD12864. When meetting the screening conditions, system sounds an alarm, and achieves an accurate, rapid screening of resistor.关键词
电阻测试仪/STC12C5A60S2/多量程/筛选Key words
Resistor tester/STC12C5A60S2/Multiple range/Screening分类
信息技术与安全科学
