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Patent
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G01G 23/06 (2006.01) G01G 3/14 (2006.01) G01G 3/16 (2006.01)
Patent
CA 1158263
DIFFERENTIAL WEIGHING SYSTEM PROVIDING IMPROVED SIGNAL TO NOISE RATIO Abstract of the Disclosure A differential weighing system is provided which includes a primary suspension having an associated weigh pan for receiving a commodity to be weighed, a secondary suspension having a natural frequency matched to that of the primary suspension, and an electrical displacement transducer for producing an output in accordance with the relative dis- placement between the two suspensions. Damping to ground is provided for each suspension in combination with damping of the relative movement between the suspensions. The two inputs of a differential amplifier are connected to the outputs of a pair of sensing coils of the displacement transducer. A low pass filter having a cutoff frequency at or near the natural frequency of the suspensions is connected to the output of the differential amplifier.
377234
Blodgett Stewart B.
Fetherstonhaugh & Co.
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