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Servovalve analyzer system

  • US 5,301,128 A
  • Filed: 05/17/1993
  • Issued: 04/05/1994
  • Est. Priority Date: 01/16/1987
  • Status: Expired due to Term
First Claim
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1. A system for driving an excitation means of a hydraulic unit under test with a precise signal in a predetermined sequence, comprising:

  • digital processor means providing a plurality of command signals for the predetermined sequence on a digital bus;

    analog command signal bus means comprising a number of analog command signal lines;

    digital to analog converter means coupling the digital bus to the analog command signal bus means;

    sensing transducer means comprising a plurality of sensing transducers providing individual signals representative of unit under test operation of different analog input signal lines forming an analog input signal bus;

    first analog signal summing means connected to the analog command signal bus and responsive to digital command signals on the digital bus for summing selected analog command signals as controlled by digital command signals;

    second analog signal summing means connected to the analog input signal bus and responsive to digital command signals on the digital bus for summing selected analog input signals as controlled by digital command signals; and

    means for combining the outputs of the first and second summing means as an excitation signal.

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