Browse Prior Art Database

Capacitance Tester

IP.com Disclosure Number: IPCOM000096265D
Original Publication Date: 1963-Mar-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 32K

Publishing Venue

IBM

Related People

Squarzini, J: AUTHOR

Abstract

This test system determines whether a capacitance under test Cx is less than a standard capacitance Cs. The system has a bridge circuit 12. In this, standard capacitor Cs is coupled to one end of center tapped transformer 14. Capacitance under test Cx is coupled to the other end. Small resistance 16 forms the current return to ground. The output from oscillator 18 energizes bridge 12 and synchronizes pulse generator 20. The output from generator 20 is applied to synchronous phase detector 22 along with the output from bridge 12.

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Capacitance Tester

This test system determines whether a capacitance under test Cx is less than a standard capacitance Cs. The system has a bridge circuit 12. In this, standard capacitor Cs is coupled to one end of center tapped transformer 14. Capacitance under test Cx is coupled to the other end. Small resistance 16 forms the current return to ground. The output from oscillator 18 energizes bridge 12 and synchronizes pulse generator 20. The output from generator 20 is applied to synchronous phase detector 22 along with the output from bridge 12.

Referring to the waveform drawing, if Cx is greater than Cs, the output waveform from bridge 12 has a phase such as that shown by waveform 26. If, however, Cx is less than Cs, there is a 180 degree phase reversal and the output waveform is as indicated at 28. At detector 22, the output from generator 20, e.
g., pulses 30, sample the waveform taken from bridge 12. The resulting positive or negative pulses 32 or 34 form an indication of the relative values of the capacitances.

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