Weighing scales – Shock absorber – damper – Electrical or magnetic
Patent
1989-01-18
1989-08-29
Miller, Jr., George H.
Weighing scales
Shock absorber, damper
Electrical or magnetic
328165, G01G 2310, H03K 500
Patent
active
048608394
ABSTRACT:
A weighing system including a weighing cell (1) which supplies a measurement signal (I) to an A/D converter (3) via a signal line (2). An interference signal (i), superposed on the measurement signal, is decoupled out of signal line (2) at the signal output of the weighing cell (1), rotated by means of an inverter (4) in terms of phase by 180.degree., and again coupled into the signal line (2) at the signal input of the A/D converter. An ohmic resistance (RO) is connected in series in the signal line (2) between the uncoupling node (AK) and the in-coupling node (EK). The interference signal (i) is decoupled preferably capacitively via a series circuit that forms the frequency-determining member of the active low-pass filter including a condenser (C) and an ohmic resistance (R1). On the other hand, a galvanic coupling (R3) is provided for the recoupling of the interference signal (-i). With this active low-pass filter, one can attain a substantially complete suppression of the interference signals without any subsequent adjustment of the filter.
REFERENCES:
patent: 3670833 (1972-06-01), Tomohiko et al.
patent: 4316517 (1982-02-01), Jonath
patent: 4591011 (1986-05-01), Baumann
patent: 4628470 (1986-12-01), Baumann
Mettler Instruments AG
Miller Jr. George H.
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