Apparatus and method for digitising impedance

Apparatus for digitising an impedance is described that comprises a first impedance element (22; 122) having a first impedance (C1; A1) that varies with a property to be measured and a second impedance element (24; 124) having a second impedance (C2; A2). The apparatus also includes a drive signal g...

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Bibliographic Details
Main Author THOMAS DAVID KENNETH
Format Patent
LanguageChinese
English
Published 08.02.2012
Subjects
ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVEREDIN A SINGLE OTHER SUBCLASS
MEASURING
MEASURING ELECTRIC VARIABLES
MEASURING MAGNETIC VARIABLES
MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE
MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
PHYSICS
TARIFF METERING APPARATUS
TESTING
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Summary:Apparatus for digitising an impedance is described that comprises a first impedance element (22; 122) having a first impedance (C1; A1) that varies with a property to be measured and a second impedance element (24; 124) having a second impedance (C2; A2). The apparatus also includes a drive signal generator (26,30) for applying a first alternating drive signal (44) to the first impedance element (22; 122) and a second alternating drive signal (46) to the second impedance element (24; 124). An analogue-to-digital converter, ADC (42; 142), receives a resultant signal (41; 52; 141 ) comprising the combination of the signals produced by the application of the first and second alternating drive signals (44,46) to the first and second impedance elements (22,24; 122, 124). The first alternating drive signal (44) is phase shifted relative to the second alternating drive signal (46) such that the resultant signal (41; 52; 141) received and sampled by the ADC (42; 142) sequentially relates to the sum of, and the differ
Bibliography:Application Number: CN201080011499