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Weight measuring system with automatic gain correction

  • US 4,080,657 A
  • Filed: 05/17/1976
  • Issued: 03/21/1978
  • Est. Priority Date: 05/21/1975
  • Status: Expired due to Term
First Claim
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1. In an electronic weigh system comprising auto gain means for automatically correcting the gain of the weigh system so as to maintain an accurate relationship between the weight of a load being measured and the value displayed or recorded, the weighing system being such that a train of pulses representing, by its repetition rate, the weight of the load, is counted over a predetermined time interval, the improvement comprising:

  • means for establishing said predetermined time interval by counting a predetermined number of pulses in a network supplied with clock pulses and with additional pulses, the number of which additional pulses corresponds to a nominal value if the required gain correction is zero but which otherwise corresponds to a correction value which varies about the nominal value according to the magnitude and sign of the correction of gain required, means for introducing a reference into a load measuring circuit to simulate precisely a predetermined load value, means for passing the reference weight pulses to a gain counter over a nominal time interval and means for utilising the least significant digits of the count to the same order as the nominal value to represent the correction value for determining the number of additional pulses to be fed to said network during each weighment.

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