摘要
介绍了电容电感测试仪的测量原理和电路设计方法,采用STC89C51单片机作为计算核心,以LC三点式振荡电路作为测量电路,采用固定的电感和电容组成LC振荡电路。单片机负责控制频率的测量,并利用单片机设计频率计测量得到分频后的频率,运用谐振频率公式,间接得到待测的电容值或电感值。该方案进行电容和电感的测试,具有电路原理简单、体积较小的优点。
This article describes the measuring principle of the capacitance and inductance measurement instrument and the circuit design method using the STC89C51 microcontroller as the computing core,LC oscillating circuit-level as the measuring circuit.Fixed inductors and capacitors are used to compose the LC oscillating circuit.The Microcontroller controls the measurement of frequency.The divided frequency is measured by a frequency tester designed with a single chip.The resonant frequency formula is used to compute the unknown capacitance or inductance value indirectly.The scheme of capacitance and inductance testing has the advantages of simple circuit and small size.
出处
《电子科技》
2010年第11期35-37,共3页
Electronic Science and Technology
关键词
电容测量
电感测量
单片机
LC振荡电路
capacitance measurement
inductance measurement
microcontroller
LC oscillator circuit
