GB2006442A - Improvements in or Relating to Measuring Low Capacitances - Google Patents

Improvements in or Relating to Measuring Low Capacitances

Info

Publication number
GB2006442A
GB2006442A GB7840632A GB7840632A GB2006442A GB 2006442 A GB2006442 A GB 2006442A GB 7840632 A GB7840632 A GB 7840632A GB 7840632 A GB7840632 A GB 7840632A GB 2006442 A GB2006442 A GB 2006442A
Authority
GB
United Kingdom
Prior art keywords
amplifier
output
low
relating
input
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
GB7840632A
Other versions
GB2006442B (en
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Vaisala Oy
Original Assignee
Vaisala Oy
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Vaisala Oy filed Critical Vaisala Oy
Publication of GB2006442A publication Critical patent/GB2006442A/en
Application granted granted Critical
Publication of GB2006442B publication Critical patent/GB2006442B/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
    • G01R27/2605—Measuring capacitance

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Resistance Or Impedance (AREA)
  • Amplifiers (AREA)
  • Transmission And Conversion Of Sensor Element Output (AREA)

Abstract

A low capacitance CM to be measured is connected between a low impedance generator, such as the output B of an inverting amplifier 1 of low output impedance, and a fixed potential point such as the input A of the amplifier 1. The amplifier 1 is connected so as to form an RC oscillator whose frequency of oscillation provides a measure of the low capacitance the above connection of CM ensuring that stray capacitance in the connecting leads has no effect on the oscillator frequency. The output B of the amplifier is connected via a circuit (R1, R3, 2, 3) forming a Schmitt trigger 4 whose output D is connected via a resistor R to the input of the amplifier 1. <IMAGE>
GB7840632A 1977-10-14 1978-10-16 Measuring low capacitances Expired GB2006442B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FI773063A FI57319C (en) 1977-10-14 1977-10-14 ADJUSTMENT OF CAPACITY IN CAPACITY

Publications (2)

Publication Number Publication Date
GB2006442A true GB2006442A (en) 1979-05-02
GB2006442B GB2006442B (en) 1982-04-28

Family

ID=8511140

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7840632A Expired GB2006442B (en) 1977-10-14 1978-10-16 Measuring low capacitances

Country Status (10)

Country Link
JP (2) JPS5498696A (en)
AU (1) AU523345B2 (en)
BR (1) BR7806786A (en)
CA (1) CA1128129A (en)
DE (1) DE2844121C2 (en)
FI (1) FI57319C (en)
FR (1) FR2410280A1 (en)
GB (1) GB2006442B (en)
IT (1) IT1100121B (en)
ZA (1) ZA785694B (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1984002780A1 (en) * 1983-01-07 1984-07-19 Nils Aoge Juul Eilersen Capacitance measuring circuit
EP0489259A2 (en) * 1990-12-06 1992-06-10 Fraunhofer-Gesellschaft Zur Förderung Der Angewandten Forschung E.V. Capacity-frequency converter
US7640806B2 (en) 2006-01-12 2010-01-05 Denso Corporation Capacitive physical quantity sensor
WO2010060428A1 (en) * 2008-11-02 2010-06-03 Nils Aage Juul Eilersen Current sensor capacitance measuring circuit
FR2977950A1 (en) * 2011-07-13 2013-01-18 Jean Noel Lefebvre CAPACITIVE DETECTION DEVICE

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2475231A1 (en) * 1980-02-04 1981-08-07 Testut Aequitas CAPACITY MEASURING DEVICE, IN PARTICULAR FOR A WEIGHTING INSTRUMENT
JPS56166411A (en) * 1980-05-27 1981-12-21 Yokogawa Hokushin Electric Corp Capacity type displacement transducer
DE3117808A1 (en) * 1981-05-06 1982-11-25 Robert Bosch Gmbh, 7000 Stuttgart CIRCUIT ARRANGEMENT FOR MEASURING INDUCTIVE CHANGES
FI69932C (en) * 1984-05-31 1986-05-26 Vaisala Oy MAINTENANCE FOUNDATION CAPACITORS SPECIFIC FOR SMAR CAPACITORS VID VILKER MAN ANVAENDER TVAO REFERENSER
JPS6114578A (en) * 1984-06-30 1986-01-22 Suzuki Shigeo Capacity meter
FI74549C (en) * 1986-02-13 1988-02-08 Vaisala Oy MAETNINGSFOERFARANDE FOER IMPEDANSER, SAERSKILT SMAO KAPACITANSER.

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3518537A (en) * 1967-11-28 1970-06-30 Richard Mcfee Apparatus and method for determining the capacitance and conductance of capacitors
US3626287A (en) * 1969-02-10 1971-12-07 C G I Corp System for responding to changes in capacitance of a sensing capacitor
FR2142732B1 (en) * 1971-06-24 1975-02-07 Commissariat Energie Atomique
FR2208121B1 (en) * 1972-11-29 1978-12-29 Commissariat Energie Atomique
US4083248A (en) * 1975-09-04 1978-04-11 Simmonds Precision Products, Inc. Digital liquid-level gauging systems

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1984002780A1 (en) * 1983-01-07 1984-07-19 Nils Aoge Juul Eilersen Capacitance measuring circuit
EP0489259A2 (en) * 1990-12-06 1992-06-10 Fraunhofer-Gesellschaft Zur Förderung Der Angewandten Forschung E.V. Capacity-frequency converter
EP0489259A3 (en) * 1990-12-06 1992-10-07 Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung E.V. Capacity-frequency converter
US7640806B2 (en) 2006-01-12 2010-01-05 Denso Corporation Capacitive physical quantity sensor
WO2010060428A1 (en) * 2008-11-02 2010-06-03 Nils Aage Juul Eilersen Current sensor capacitance measuring circuit
CN102203624A (en) * 2008-11-02 2011-09-28 西门子公司 Current sensor capacitance measuring circuit
US8604809B2 (en) 2008-11-02 2013-12-10 Siemens Aktiengesellschaft Current sensor capacity measuring system
CN102203624B (en) * 2008-11-02 2015-05-20 西门子公司 Current sensor capacitance measuring circuit
FR2977950A1 (en) * 2011-07-13 2013-01-18 Jean Noel Lefebvre CAPACITIVE DETECTION DEVICE
WO2013007934A3 (en) * 2011-07-13 2013-03-28 Noalia Gestion Capacitive sensing device

Also Published As

Publication number Publication date
DE2844121A1 (en) 1979-04-19
JPS62201074U (en) 1987-12-22
JPH056544Y2 (en) 1993-02-19
FI57319C (en) 1980-07-10
DE2844121C2 (en) 1981-09-24
CA1128129A (en) 1982-07-20
JPS5498696A (en) 1979-08-03
BR7806786A (en) 1979-05-15
FI57319B (en) 1980-03-31
AU4067578A (en) 1980-04-17
ZA785694B (en) 1979-09-26
FR2410280A1 (en) 1979-06-22
GB2006442B (en) 1982-04-28
FR2410280B1 (en) 1984-01-06
FI773063A (en) 1979-04-15
AU523345B2 (en) 1982-07-22
IT7828692A0 (en) 1978-10-12
IT1100121B (en) 1985-09-28

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19961016