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Vibration severity indicator

  • US 4,302,977 A
  • Filed: 04/04/1980
  • Issued: 12/01/1981
  • Est. Priority Date: 04/04/1980
  • Status: Expired due to Term
First Claim
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1. A vibration severity indicator for displaying transducer derived vibration levels of machines having predetermined machine classifications comprising:

  • conductor means connectable with said transducer for receiving electrical signals therefrom related to an instantaneous vibration amplitude of a said machine;

    a plurality of serially connected resistors for receiving said signals including contacts for effecting select electrical connections between adjacent ones of said resistors;

    means for conveying said signals to said plurality of resistors;

    switch means manually actuable for electrical communication with selected ones of said contacts and having visible indicia associated with each said contact corresponding with a unique said machine classification;

    amplifier means coupled with said switch means for amplifying the signal derived from a selected said contact;

    converter means coupled with said amplifier means for deriving an output signal corresponding with the logarithm of the RMS value of said amplified signal;

    a direct current meter responsive to said output signal for providing a readout indicating the instantaneous direct current value of said converter means output signal on a basis from zero to full scale, said meter having a common scale with indicia comprised of segments of predetermined width extending in mutual adjacency substantially from the zero to full scale of said meter, each said segment having a visual indication associated therewith representative of a qualitative evaluation of said vibration levels;

    said resistors having resistance values selected to provide said zero to full scale basis in correspondence with a fixed range of vibration levels expressed in decibels.

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