Simple method for measuring the equivalent series inductance and resistance of electrolytic capacitors

K. M. Tsang, Wai Lok Chan

Research output: Journal article publicationJournal articleAcademic researchpeer-review

18 Citations (Scopus)


A simple equivalent series inductance (ESL) and equivalent series resistance (ESR) measurement technique for capacitors is presented. A low-cost square waveform voltage source coupled with a reference resistor can be used to measure the ESL, ESR and capacitance of an electrolytic capacitor. By connecting a capacitor in series with a reference resistor, the equivalent output step response of the capacitor voltage reveals the ESL and ESR of the capacitor. To effectively capture the output step response, a square input waveform is used instead. The square waveform voltage source can easily be realised using a DC voltage source and simple switching devices. Experimental results are included to demonstrate the effectiveness of the proposed scheme.
Original languageEnglish
Article numberIPEEBO000003000004000465000001
Pages (from-to)465-471
Number of pages7
JournalIET Power Electronics
Issue number4
Publication statusPublished - 1 Jul 2010

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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