Electronic battery testing device

  • US 4,816,768 A
  • Filed: 03/18/1988
  • Issued: 03/28/1989
  • Est. Priority Date: 03/18/1988
  • Status: Expired due to Term
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First Claim
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1. An electronic device for testing a direct current energy source comprising:

  • a. high-gain amplifier means receiving dc power through amplifier dc power terminals;

    b. internal voltage-feedback means, including low-pass filter means, interconnecting the output and the input of said high-gain amplifier means;

    c. external current-feedback means, including feedback resistor means, conducting a current from the output of said high-gain amplifier means through said direct current energy source.d. oscillator means producing a periodic oscillator signal, siad oscillator means receiving dc power through oscillator dc power terminals connectd directly in parallel with said amplifier dc power terminals;

    e. voltage summing and coupling means adding voltage derived from said periodic oscillator signal to the voltage across said direct current energy source, and capacitively coupling the sum voltage to the input of said high-gain amplifier means;

    f. detector means producing a dc output signal in response to the ac voltage component across said feedback resistor means; and

    g. display means responsive to the level of said dc output signal.

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