用装有锁相放大器的标准电流探头测量低交流电流

2022 International Conference on Diagnostics in Electrical Engineering (Diagnostika) Pub Date : 2022-09-06 DOI:10.1109/Diagnostika55131.2022.9905091

J. Svarny

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引用次数: 1

摘要

大多数标准电流探头用于测量中等或更高的电流。通常，由于探头的动态范围、特性灵敏度和内部噪声的限制，几乎不可能测量低于100 mA的电流。本文讨论了通过增加一个外部锁相放大器来扩展电流探头动态范围的可能性。本文概述了锁相放大器的工作原理，并设计了基于AD630电路的锁相放大器实验室夹具。设计的放大器用于调节Agilentll46A电流探头的输出。对实验进行了详细的描述。结果表明，由于锁相放大器可以很容易地检测到低于1ma的电流。

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Measurement of low AC currents by the standard current probe equipped with lock-in amplifier

Most of standard current probes are intended for the measurement of medium or higher currents. Usually, due to limited dynamic range, characteristic sensitivity and inner noise of the probe, it is hardly possible to measure currents lower than 100 mA. The paper deals with the possibility to extend the dynamic range of the current probe by an additional external lock-in amplifier. The paper describes the principle of the lock-in amplifier in general and design of the laboratory fixture of lock-in amplifier based on AD630 circuit as well. The designed amplifier was used to condition the output of the Agilentll46A current probe. The experiment is described in detail. The results show that thanks to the lockin amplifier the currents even lower than 1 mA can be easily detected.

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2022 International Conference on Diagnostics in Electrical Engineering (Diagnostika)

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