An Accurate Method For Measuring Capacitor ESL


Connection of the Bode 100 and B-SMC impedance adapter.

With ESL values typically in the range of 1 nH to 5 nH, measuring the ESL of chip capacitors is not a trivial task. At present, some designers try to measure ESL by measuring the resonant frequency of the capacitor, and calculating inductance from that reading. Unfortunately, such measurements are often inaccurate because of the parasitic inductance in the test setups or lack of probe and adapter calibration. Perhaps it’s no wonder that most designers simply don’t bother to measure ESL at all.

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#design #articles #capacitors #impedancemeasurement #picotest

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