Electrical system test apparatus

  • US 4,086,531 A
  • Filed: 04/26/1976
  • Issued: 04/25/1978
  • Est. Priority Date: 04/26/1976
  • Status: Expired due to Term
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First Claim
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1. In a test system for testing and analyzing an electrical system including an alternator assembly, a battery charged by the alternator assembly and connected thereto, and a regulator connected to the alternator assembly for controlling the charging of the battery, the alternator assembly including an alternator and a rectifier circuit whereby an output voltage is provided having a d-c voltage with a superimposed a-c ripple, the output voltage being provided at an output terminal on the alternator and an electrical ground, said system comprising a plurality of indicator circuits for indicating the condition of at least two of the alternator, rectifier circuit, regulator and/or battery, an input circuit means connected between the alternator assembly and the plurality of indicator circuits for providing an unfiltered voltage having an magnitude varying in accordance with the variations in magnitude of the d-c voltage and the a-c ripple, said input circuit means comprising only a single pair of lead conductors with one of said conductors adapted to be connected to the output terminal of the alternator and the other adapted to be connected to the electrical ground whereby said unfiltered voltage is provided by said pair of conductors without altering the alternator assembly, said input circuit means also providing a filtered voltage derived from said unfiltered voltage from said single pair of conductors and having a generally uniform magnitude varying in accordance with the magnitude of the output voltage, said input circuit means also providing a source of a reference voltage derived from said unfiltered voltage from said single pair of conductors and having a preselected magnitude less than and independent of the magnitude of the output voltage, said reference voltage being interconnected with at least some of said indicator circuits, one of said indicator circuits being connected to receive said unfiltered voltage and said filtered voltage for comparing said filtered voltage and said unfiltered voltage and providing an output indication when the magnitude of said filtered voltage and the magnitude of said unfiltered voltage including its a-c ripple bear a preselected relationship, one to the other, the remainder of said plurality of indicator circuits being connected as comparator circuits, one input to said remainder of said indicator circuits being connected to sense a preselected percentage of said filtered voltage and comparing that preselected percentage to said reference voltage, each of said remaining indicator circuits providing an output indication when said percentage bears a preselected relationship to said reference voltage to indicate selected faults in the alternator, regulator and/or the battery.

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