Battery tester

  • US 5,862,515 A
  • Filed: 02/14/1997
  • Issued: 01/19/1999
  • Est. Priority Date: 02/16/1996
  • Status: Expired due to Term
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First Claim
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1. A battery tester comprising:

  • an AC constant-current generator for applying an AC current for measurement to a battery under test,internal resistance detecting means having wave detection means connected to the AC constant-current generator and being adapted to be disposed between terminals of the battery, said internal resistance detecting means detecting a voltage proportional to an internal resistance of said battery in synchronism to a phase of the AC current when said AC current is applied thereto,voltage detecting means adapted to be connected to the battery for detecting a DC terminal voltage of said battery, anddeterioration judging means connected to the internal resistance detecting means and said voltage detecting means, said deterioration judging means judging deterioration of said battery from said internal resistance detected by said internal resistance detecting means and said DC terminal voltage detected by said voltage detecting means.

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