Weighing scales – Shock absorber – damper – Electrical or magnetic
Patent
1983-11-30
1985-07-30
Goldberg, E. A.
Weighing scales
Shock absorber, damper
Electrical or magnetic
177211, 7386267, G01G 2310, G01G 314
Patent
active
045316007
ABSTRACT:
A link of controllable resistance comprising an FET (Q16) connected in series with a low-value resistor (R15) is connected in parallel with a time constant determining resistance (R11) in an RC type low-pass filter. A discriminator circuit (40, 50, 60) provides an on/off type signal following variations in the DC component of an input signal present on a terminal (A). A retriggerable monostable (80) defines a "neutral" time interval of predetermined duration running from the beginning of said on/off signal. At the end of said neutral period, a circuit (20) switches the FET on, thereby reducing the time constant of the RC network in the RC low-pass filter. This time constant is subsequently progressively rasied to a high value by progressively switching the FET off. The filter is specially applicable to weighing a body that is subjected to movement or to oscillation, or to performing weighing measurements in a vibrating environment.
REFERENCES:
patent: 3434343 (1969-03-01), Senour
patent: 3525991 (1970-08-01), Kohler
patent: 4045731 (1977-08-01), Tokunou et al.
patent: 4120370 (1978-10-01), Bosson et al.
Brisset Gilbert C.
Langlais Jacques F.
Foster Patrick W.
Goldberg E. A.
Testut-Aequitas
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