Patent ID: 7425833

Claim:
Apparatus employing time-varying signals to test an electrochemical cell or battery comprising: measuring circuitry adapted to couple to said cell or battery with separate current-carrying and voltage-sensing conductors, a contacting cable section comprising first and second conductor pairs, said first conductor pair contacting a first terminal of said cell or battery with a first current-carrying conductor and a first voltage-sensing conductor, said second conductor pair contacting a second terminal of said cell or battery with a second current-carrying conductor and a second voltage-sensing conductor, said contacting cable section characterized by positive mutual inductance coupling between its current-carrying and voltage-sensing conductors; and, a canceling cable section comprising third and fourth conductor pairs interposed between said contacting cable section and said measuring circuitry, said third conductor pair comprising a third current-carrying conductor and a third voltage-sensing conductor and said fourth conductor pair comprising a fourth current-carrying conductor and a fourth voltage-sensing conductor, said third and fourth current-carrying conductors adapted to couple current-carrying conductors of said contacting cable section to current carrying conductors of said measuring circuitry and said third and fourth voltage-sensing conductors adapted to couple voltage sensing conductors of said contacting cable section to voltage-sensing conductors of said measuring circuitry, said canceling cable section characterized by distributed negative mutual inductance coupling between its current-carrying and voltage-sensing conductors.