Weighing scales – Processes
Patent
1977-01-12
1978-08-01
Hartary, Joseph W.
Weighing scales
Processes
177185, 177210EM, G01G 2310
Patent
active
041037502
ABSTRACT:
A method of producing signals for a damping control of an electric measurvalue indicator, especially an electromagnetic precision balance, having an active filter or impedance transformer located in a branch which filters out the a.c. voltage is disclosed. Transient signals in the form of a.c. voltages with different frequencies are applied to the output of the active filter or transformer in the noise range. Sequentially tapped values of the a.c. voltages are compared in the noise range with previous values. A circuit for producing signals for a damping control of an electric measured-value indicator includes a comparator connected with the low ohmage output of a filter or impedance transformer. The comparator is provided with a switchable voltage storage device to which a differentiating element and an amplifier are connected. When a.c. voltages in the noise range are applied, these voltages can be differentiated, amplified, and if necessary rectified and filtered out at the circuit output for subsequent damping evaluation.
REFERENCES:
patent: 3789937 (1974-02-01), Strobel
patent: 3802522 (1974-04-01), Thompson
Melcher Franz Josef
Oldendorf Christian
Hartary Joseph W.
Sartorius-Werke GmbH (und vorm. Gottinger Prazisionswaagenfabrik
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