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The Theory of Operation for Our Tweezers-Style LCR Meters

Updated: Oct 4, 2020

Our tweezers-style #LcrMeter uses “automatic balancing bridge method” to measure R, L and C. The diagram is as below:

R is a standard resistor which is always equal to the current flowing through the DUT (Device Under Test). The L side of DUT (lower voltage side) is always equal to the virtual ground level (electric potential = 0). At this condition, the impedance value of the DUT (Zx) can be determined from the voltage on the DUT (Vx), feedback resistance R and input voltage V1 as follows:


Zx = R * Vx / V1


Reference: Keysight Technologies Impedance Measurement Handbook – A guide to measurement technology and techniques

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