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AC level calibration apparatus

  • US 4,799,008 A
  • Filed: 04/07/1987
  • Issued: 01/17/1989
  • Est. Priority Date: 04/14/1986
  • Status: Expired due to Term
First Claim
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1. An analog test system, comprising:

  • a DC power source for generating a DC reference voltage;

    a digital signal generator for generating an alternating control signal which is a first level signal for a first time period, and a second level signal for a second time period;

    an analog switching device, coupled to an output of said DC power source and an output of said digital signal generator, for interrupting the flow of the reference voltage based on the alternating control signal generated by said digital signal generator and for changing the reference voltage into an AC level calibration signal waveform;

    a waveform digitizer, coupled to said analog switching device, for converting the AC level calibration signal into a digital data signal;

    digital signal processing means, coupled to said waveform digitizer, for obtaining reference values from the digital data signal;

    comparing means for comparing said reference values from the digital data signal with predetermined reference values and for obtaining an AC level error; and

    compensating means for calibrating for said AC level error.

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