Micro Resistance Tester Based on AC Constant Current Excitation

DOI

10.2991/aetr-17.2018.74How to use a DOI?

Keywords

Micro-resistance measurement; Sine constant current excitation source; Phase-locked amplification

Abstract

The traditional four-probe method to extract the response signal of the micro-resistance under test can improve the accuracy of the lead resistance and the contact resistance on the measurement result, but not effectively eliminate the internal noise of the operational amplifier and the external electromagnetic interference. In this paper, a sinusoidal constant current source excited by a fixed frequency is used to inject a response signal from a low-noise, high-impedance operational amplifier. After the phase-locked amplification and filter circuits are combined to form an adjustment circuit, the fixed frequency signal is shaped and dynamically phase-shifted , Into the lock-in amplifier as a reference signal. The developed prototype (0-1?) and a dedicated impedance tester were tested, the test results show that the prototype work is stable, with higher measurement accuracy.

Copyright

© 2018, the Authors. Published by Atlantis Press.

Open Access

This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

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TY  - CONF
AU  - Qian Zhang
AU  - Miao Shen
AU  - Zhongru Shen
PY  - 2018/03
DA  - 2018/03
TI  - Micro Resistance Tester Based on AC Constant Current Excitation
BT  - Proceedings of the 2017 International Conference Advanced Engineering and Technology Research (AETR 2017)
PB  - Atlantis Press
SP  - 387
EP  - 392
SN  - 2352-5401
UR  - https://doi.org/10.2991/aetr-17.2018.74
DO  - 10.2991/aetr-17.2018.74
ID  - Zhang2018/03
ER  -