Electronic battery tester with normal/cold test modes and terminal connection detection

  • US 6,388,448 B1
  • Filed: 03/13/2001
  • Issued: 05/14/2002
  • Est. Priority Date: 03/13/2001
  • Status: Active Grant
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First Claim
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1. An electronic battery tester with normal test and cold test modes comprising:

  • a first circuit for applying an AC current load to a battery under test to induce an AC signal across the terminals of the battery;

    a second circuit for measuring the induced AC signal and converting it to a first voltage potential signal which is a measure of the battery'"'"'s internal resistance;

    means for adjusting said first voltage potential signal to a second voltage potential signal;

    third circuit for generating a threshold voltage potential signal at a first value when the battery tester is in a normal test mode and at a second value when the battery tester is in a cold test mode;

    a comparison circuit for comparing said second voltage potential signal to said threshold voltage potential signal to determine a condition of said battery.

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