1
Akira Shimizu: Apparatus for and method of measuring capacitance with high accuracy. Agilent Technologies, January 27, 2004: US06683462 (101 worldwide citation)

For measuring a capacitance with high accuracy, a capacitance measuring apparatus includes a voltage source with a current limiting function for applying different voltage values to the capacitance, and an integrator capable of continuous integrating operation for repeatedly integrating a current fl ...


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Brown Chris J: Capacitance measuring apparatus for lcd touch screen. Sharp, May 10, 2006: GB2419950-A (14 worldwide citation)

An apparatus 20 for measuring capacitance comprises a capacitor network 31 having a plurality of states presenting different capacitances. A sense amplifier 30 compares a capacitance to be measured with the capacitance of the network 31 and a comparator 32 supplies an output indicating whether the c ...


3
Brian E Pitches, Robert M S Murray, Douglas J Rogers: Capacitance measuring apparatus. 501 Ferranti, Kerkam Stowell Kondracki & Clarke, July 12, 1983: US04392378 (13 worldwide citation)

Capacitance measuring apparatus comprises a variable capacitor VC and a reference capacitor FC. Circuits D, ID, are provided for generating a periodic waveform for application directly to the variable capacitor, and in inverted form to the reference capacitor. Switches means SM are operated by contr ...


4
Masahiro Kinoshita, Hideyuki Urata, Hideshi Tsugui, Yoshihiro Tanabe: Capacitance measuring apparatus and method, and program. Omron Corporation, Osha Liang, April 17, 2007: US07205776 (13 worldwide citation)

Whether a human body is touching or not is detected highly accurately at high speed. Switch SW1 is turned on to charge condenser Ca by power supply Vcc. The switch SW1 is turned off to transfer the electric charge charged in the condenser Ca to condensers Cs and Cx. The switches SW2 and SW3 are repe ...


5
Clifford O Shaw: Direct reading capacitance meter. The United States of America represented by the Secretary of the Navy, R S Sciascia, W Thom Skeer, James B Bechtel, August 11, 1981: US04283676 (9 worldwide citation)

A high capacitance measuring apparatus which provides a direct reading of unknown large capacitor using a voltage comparator, a multi-vibrator flip-flop circuit, and a ramp generator. A timing post which corresponds to one RC time for the capacitor being measured feeds into a ramp generator. The ram ...


6
Alex D Colvin: Capacitance measuring apparatus with means for nulling the resistive component. Ford Motor Company, Allan J Lippa, Peter Abolins, May 7, 1991: US05014011 (8 worldwide citation)

A circuit and method for measuring the capacitance of a medium independent of the resistivity of the medium. A triangular voltage is applied to plates immersed in the medium to generate both a resistive current component in phase with the triangular voltage and a capacitive current component in phas ...


7
Shawhan Elbert N: Capacitance-measuring apparatus including means maintaining the voltage across the unknown capacitance constant. Sun Oil Company, March 7, 1972: US3648165 (8 worldwide citation)

The total voltage across a series resistance-capacitance circuit (wherein the capacitance is that of a measuring probe) supplied by an alternating current source is controlled so as to maintain the voltage across the capacitance constant as the measured capacitance varies. This provides a linear tot ...


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Gobert Gerald: Improvements in or relating to apparatus for investigating the moisture content of materials. John Gallwey Instr, March 27, 1963: GB922225-A (6 worldwide citation)

922,225. Determining physical qualities of materials. Sir JOHN GALLWAY (INSTRUMENTS) Ltd. June 1, 1959, No. 18652/59. Class 37. A probe for moisture determination comprises two elongated electrodes bonded together over substantially the whole of their length. As shown, the electrodes 1, 2 of alumini ...


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Kinoshita Masahiro, Urata Hideyuki, Tsugui Hideshi, Tanabe Yoshihiro: Capacitance measuring apparatus and method. Omron Tateisi Electronics Co, March 15, 2006: EP1635147-A2 (6 worldwide citation)

Whether a human body is touching or not is detected highly accurately at high speed. Switch SW1 is turned on to charge condenser Ca by power supply Vcc. The switch SW1 is turned off to transfer the electric charge charged in the condenser Ca to condensers Cs and Cx. The switches SW2 and SW3 are repe ...