Design of Measurement Circuit for Weak DC Signal

ZHAO Yong1; GUO Liang2; CHENG Yong-hong2

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Design of Measurement Circuit for Weak DC Signal

更新时间：2025-04-26

- Design of Measurement Circuit for Weak DC Signal
- High VoltageApparatus Issue 4, Pages: 356-358(2008)
- 作者机构：
  
  1. 西安热工研究院有限公司
  2. 西安交通大学
- 作者简介：
- 基金信息：
- DOI：
  CLC： TM933.1
- Published：2008
- 稿件说明：
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[1]赵勇,郭亮,成永红.微弱直流信号测量电路设计[J].高压电器,2008(04):356-358.

ZHAO Yong1, GUO Liang2, CHENG Yong-hong2. Design of Measurement Circuit for Weak DC Signal[J]. High voltageapparatus, 2008, (4): 356-358.
[1]赵勇,郭亮,成永红.微弱直流信号测量电路设计[J].高压电器,2008(04):356-358. DOI：

ZHAO Yong1, GUO Liang2, CHENG Yong-hong2. Design of Measurement Circuit for Weak DC Signal[J]. High voltageapparatus, 2008, (4): 356-358. DOI：

摘要

为了提高XLPE电缆直流法在线监测的测量精度

需对微弱直流信号进行测量。笔者介绍了XLPE电缆直流法在线监测系统中微弱直流信号测量电路的设计方案

分析和比较了几种初级放大电路的性能

研究了测量电路中的几个关键模块设计。试验结果表明

该测量电路的设计方案可以较精确地测量约为1nA的直流信号

平均误差约为2%

能够满足监测系统对信号的精度要求。

Abstract

The measurement of weak DC signal is the key technique for on-line DC monitoring system with XLPE power cables to improve its measurement accuracy.Designs of the key units in measuring circuit for weak DC signal and a design of digital filter were developed.The measuring circuit was examined

and the results of examination show that the measuring circuit can detect 1 nA DC current

and the average error is less than 2%

which agrees the requirement of on-line DC monitoring system with XLPE power cables for DC signal measurement.

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