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Portable accelerometer

  • US 4,245,510 A
  • Filed: 04/11/1979
  • Issued: 01/20/1981
  • Est. Priority Date: 07/06/1978
  • Status: Expired due to Term
First Claim
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1. A portable accelerometer unit for measuring excursions from a datum due to an applied load, comprising in combination;

  • an accelerometer device mounted by suspension in a housing, and operable to generate an output signal in response to displacement from said datum due to the applied load;

    an electrical circuit connectible to said accelerometer device to receive the output signal therefrom, said circuit including at least one operational amplifier stage containing an operational amplifier, the operational amplifier having input terminals and an output terminal;

    one of said input terminals being connected through a first variable resistance to a power supply, with the other input terminal being connected to the accelerometer to receive the output signal therefrom, the other input terminal having a feedback circuit operatively associated with it, said feedback circuit being controlled by a second variable resistance, said variable resistances being adjustable to zero the accelerometer output due to gravity; and

    an output device connected to said output terminal to provide a readout of said applied load.

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