模拟直流标准电阻器的研制  

Standard DC resistor analog

作　　者：徐彩军 Xu Caijun(Fujian Academy of metrology,Fuzhou Fujian,350003)

机构地区：[1]福建省计量科学研究院,福建福州350003

出　　处：《电子测试》2020年第20期26-28,71,共4页Electronic Test

摘　　要：传统标准电阻器由于功率小承受电流小,无法用来检测回路电阻测试仪和直阻仪等大电流四线直流电阻测试仪。针对这一问题,设计了零磁通大电流传感器对大电流进行准确测试,配合低噪声的电路架构、高分率的模数转换器和差分模数转换电路构成了模拟直流标准电阻器,经测试该模拟直流标准电阻器最大允许相对误差小于0.05%,电流最大允许误差小于0.02%,满足对直流小电阻测试仪的检定要求。The traditional standard resistor can’t be used to test the high current four wire DC resistance tester,such as loop resistance tester and direct resistance tester,due to its low power and low current.In order to solve this problem,a zero flux high current sensor is designed to accurately test the large current.The analog DC standard resistor is composed of low noise circuit structure,high-resolution analog-to-digital converter and differential analog-to-digital conversion circuit.The maximum allowable relative error of the analog DC standard resistor is less than 0.05%,and the maximum allowable error of current is less than 0.02%Verification requirements of resistance tester.

关 键 词：模拟直流标准电阻 零磁通电流传感器 低噪声电路 DAC合成 

分 类 号：TM934.1[电气工程—电力电子与电力传动]