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PROGRAMMABLE MULTI-MODE PHASE SENSITIVE VOLTMETER

  • US 3,757,214 A
  • Filed: 07/06/1971
  • Issued: 09/04/1973
  • Est. Priority Date: 07/06/1971
  • Status: Expired due to Term
First Claim
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1. A phase sensitive voltmeter comprising:

  • a. first channel means for receiving a test signal;

    b. second channel means for receiving a reference signal;

    c. means operatively connected to said first and second channel means for phase shifting said reference signal with respect to said test signal;

    d. detecting means operatively connected to said phase shifting means and said first and second channel means for generating signals representing test signal measurements; and

    e. quadrant selector means operatively connected to said second channel means, detecting means, and phase shifter means for selecting the quadrant nearest said shifted reference signal.

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