The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 01, 1978
Filed:
Jan. 12, 1977
Franz Josef Melcher, Ellierode, DE;
Christian Oldendorf, Gottingen, DE;
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.