Importance

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Abstract

A method of measuring a condition of a battery is disclosed comprising the steps of: inducing an AC signal across the terminals of the battery by applying an AC current load thereto; measuring the induced AC signal and converting it to a first voltage potential signal which is a measure of the battery's internal resistance; applying the first voltage potential signal across a voltage divider network calibrated in accordance with a predetermined battery rating scale to render a multiplicity of second voltage potential signals at a corresponding multiplicity of taps along the voltage divider network, values of the second voltage potential signals being representative of the calibrated battery rating scale; and sequentially selecting the second voltage potential signals along the taps for comparison with a threshold voltage potential signal to determine a measure of the condition of the battery. An electronic battery tester is also disclosed including a voltage divider network coupled across the first voltage potential signal and calibrated in accordance with a predetermined battery rating scale to create from the first voltage potential signal a multiplicity of second voltage potential signals at a corresponding multiplicity of taps along the voltage divider network, and a rotary switch for selecting the second voltage potential signal of the multiplicity of second voltage potential signals along the taps based on a predetermined battery rating of the battery under test for comparison with a threshold voltage potential signal to determine a condition of the battery.

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First Claim