04392378 is referenced by 13 patents and cites 10 patents.

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 control logic CL to connect the two capacitors in sequence to the input of an integrating amplifier IA, the output of which is applied to a comparator CM to which is also applied a reference level. The output of the comparator controls the control logic. Output of the control logic is converted to an indication of the capacitance of the variable capacitor relative to that of the reference capacitor.

Title
Capacitance measuring apparatus
Application Number
6/180885
Publication Number
4392378
Application Date
August 25, 1980
Publication Date
July 12, 1983
Inventor
Douglas J Rogers
Midlothian
GB
Robert M S Murray
Edinburgh
GB
Brian E Pitches
Lothian
GB
Agent
Kerkam Stowell Kondracki & Clarke
Assignee
501 Ferranti
GB
IPC
G01R 27/26
G01F 23/26
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