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FORCE MEASURING APPARATUS INCLUDING SENSITIVITY SELECTION MEANS

  • US 3,788,410 A
  • Filed: 08/02/1972
  • Issued: 01/29/1974
  • Est. Priority Date: 08/19/1971
  • Status: Expired due to Term
First Claim
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1. Weighing apparatus, comprising a. means including at least one mechanical oscillator for producing a signal voltage the frequency of which is a function of the force to be measured;

  • b. frequency multiplier means for multiplying the frequency of said signal voltage, thereby to provide a high frequency counting pulse signal;

    c. pulse counter means having first and second stages;

    d. stage selection switch means including a pair of output terminals connected with the first and second stages of said counter means, respectively, said stage selection switch means including also an input terminal;

    e. gate means having an output terminal connected with the input terminal of said stage selection switch means, said gate means including an input terminal connected with said frequency multiplier means;

    f. means including a reference oscillator and frequency divider means for operating said gate means between conductive and nonconductive conditions in which counting pulses from said frequency multiplier means are conducted to and isolated from said stage selection switch means, respectively, said frequency divider means including high and low frequency output terminals;

    g. means including a gate timing switch for varying between two given lengths the duration of the conductive periods of said gate means, said gate timing switch being operable between first and second positions to alternately supply said high and low frequency outputs to said gate means and to simultaneously switch said stage selection switch means between its first and second positions, respectively, whereby when said gate timing and stage selection switches are in their first positions, counting pulses for a measurement of one order of sensitivity are supplied to one stage of said counter means, and when said switches are in their second positions, counting pulses for a measurement of another order of sensitivity are supplied to the other stage of said counter means; and

    h. indicator means connected with said counter means for digitally representing the magnitude of the loda being measured as a function of the instantaneous count of said counter means.

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