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Precision test frequency generator

  • US 3,992,680 A
  • Filed: 07/30/1975
  • Issued: 11/16/1976
  • Est. Priority Date: 07/30/1975
  • Status: Expired due to Term
First Claim
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1. A precision test generator producing sinusoidal output waves in a predetermined range to simulate the output of an instrument yielding a sinusoidal signal within said range, said sinusoidal signal having a noise component superimposed thereon, said test generator comprising:

  • A. a stable-frequency standard having a predetermined high-frequency;

    B. means coupled to said standard to divide the frequency thereof to produce intermediate frequency pulses whose repetition rate is a selected sub-multiple of said high frequency and a predetermined multiple of the desired output frequency of the test generator within said range, said divider means being constituted by a multi-stage counter provided with a multi-contact selector switch whose contacts are connected to the respective stages of the counter to derive pulses of the desired repetition rate;

    C. a triangle generator responsive to said pulses to produce a triangular wave whose frequency corresponds to the desired output frequency, said triangular wave having a staircase formation whose number of steps is determined by said multiple; and

    D. means coupled to said triangle generator to transform said triangular wave into a sinusoidal output wave of the same frequency with a staircase component simulating said signal.

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