Design about Simple Tester of Low Capacitance Based on MAX038
Simple tester of low capacitance was designed based on MAX038 in this paper.The principle is that external capacitor of MAX038 as test capacitor to provide corresponding frequency signal output,and TM4C123GH6PM was selected to measure frequency by equal precision and calculate test capacitance.In order to improve the accuracy,data were piecewise fitted by the least square method,and comparison tests were between high accuracy capacitance tester and the simple tester to realize auto correction and show measurement results.The tester can detect 10pF~1μF capacitor.Test results show that the tester is running stable,rapid measuring; accuracy is grade 1.
MAX038 test of low capacitance TM4C123GH6PM frequency measurement by equal precision
Zheng Liping
Photoelectric Engineering College of Yunnan Open University, Kunming, China, 650500
国际会议
重庆
英文
115-119
2015-03-28（万方平台首次上网日期，不代表论文的发表时间）