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Portable electro-magnetic field detection and measurement apparatus for near-field test and measurements

  • US 5,773,974 A
  • Filed: 04/13/1995
  • Issued: 06/30/1998
  • Est. Priority Date: 04/13/1995
  • Status: Expired due to Term
First Claim
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1. Hand-held apparatus for detecting and measuring the near-field strength of an electromagnetic field, said apparatus comprising:

  • receiving means for detecting and converting broad-band electromagnetic field radiation into alternating-current signals representing said broad-band electromagnetic field radiation;

    signal conversion means, coupled to the receiving means, for converting said alternating-current signals into direct-current signals; and

    signal strength indicating means, coupled to the signal conversion means, for indicating the magnitude of the strength of said electromagnetic field radiation in response to said direct-current signals;

    said signal strength indicating means including a voltage-controlled oscillator, having a reference voltage, for converting said direct-current signals having a magnitude greater than the reference voltage into an alternating-current signal having a frequency directly proportional to the magnitude of said broad-band electromagnetic field radiation.

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