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BATTERY CELL TESTER

  • US 3,879,654 A
  • Filed: 02/23/1973
  • Issued: 04/22/1975
  • Est. Priority Date: 02/23/1973
  • Status: Expired due to Term
First Claim
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1. A multi-purpose battery tester comprising:

  • a. a housing including a case;

    b. a pair of probe units connected mechanically to said case and operable for performing four independent tests on a battery by varying the points of engagement of said pair of probe units with the battery;

    c. circuit means mounted within said case electrically connected in circuit relationship with said pair of probe units and operable to determine alternately the condition of the individual cells of a battery when said pair of probe units are inserted successively into adjacent pairs of cells of the battery, the short or drain condition of the battery when said pair of probe units are inserted successively into pairs of alternate cell openings of the battery, the condition of a voltage regulator connected in electrical circuit with a battery when one of said pair of probe units is inserted into the cell opening nearest the positive terminal of the battery and the other of said pair of probe units is touched to the positive terminal of the battery and the ability of a battery to take a charge by repeating each of the three preceding tests while the battery is being charged, said circuit means including a first pair of diodes connected in circuit relation with one of said pair of probe units, a calibration potentiometer having one side thereof connected in circuit relation with said first pair of diodes, a second pair of diodes connected in circuit relation with the other side of said calibration potentiometer and to the other of said pair of probe units, and a resistor connected in circuit relation between said pair of probe units, said first and second pairs of diodes, said resistor and said calibration potentiometer all being mounted on a printed circuit board and connected in circuit relation therewith so as to provide a battery cell tester with a circuit insensitive to polarity; and

    d. display means mounted in said case electrically connected in circuit relationship with said circuit means, said display means comprising a meter having one side thereof connected in circuit relation with said first pair of diodes and the other side thereof connected in series circuit relation with said one side of said calibration potentiometer, said meter being operable to provide alternately a visual indication of the results of each of the four independent tests performed on a battery with the battery tester as determined by said circuit means.

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