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:
Oct. 14, 1986
Filed:
Jul. 05, 1983
Joseph L Horner, Cambridge, MA (US);
Other;
Abstract
A capacitance measuring device having an astable multivibrator, a monostable multivibrator, a metering circuit and an overrange circuit. The astable multivibrator generates a repetitive series of evenly spaced pulses which are received by the monostable multivibrator to which a capacitor of unknown value is connected. Each of the pulses initiating a voltage output in the monostable multivibrator which remains in the high state for a length of time linearly proportioal to the value of the unknown capacitor. Thereafter, the voltage output of the monostable multivibrator reverts to the low state and remains at the low state until it receives the next one of the repetitive pulses. The metering means averages the high and low states of the voltage output and provides a pair of average voltage readings indicative of capacitance value of the unknown capacitance. One of the average voltage readings being a true reading of the value of the unknown capacitor and the other of the average voltage readings being a false reading of the value of the unknown capacitor. The overrange circuit provides an indication when the reading of capacitance value is false thereby enabling a user of the device to disregard this reading.