GB2242279A - Measuring low capacitances - Google Patents

Measuring low capacitances Download PDF

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Publication number
GB2242279A
GB2242279A GB9101869A GB9101869A GB2242279A GB 2242279 A GB2242279 A GB 2242279A GB 9101869 A GB9101869 A GB 9101869A GB 9101869 A GB9101869 A GB 9101869A GB 2242279 A GB2242279 A GB 2242279A
Authority
GB
United Kingdom
Prior art keywords
oscillator
measured
measurement
capacitances
coupling
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.)
Withdrawn
Application number
GB9101869A
Other languages
English (en)
Other versions
GB9101869D0 (en
Inventor
Jorma Ponkala
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 GB9101869D0 publication Critical patent/GB9101869D0/en
Publication of GB2242279A publication Critical patent/GB2242279A/en
Withdrawn legal-status Critical Current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)
GB9101869A 1990-02-07 1991-01-29 Measuring low capacitances Withdrawn GB2242279A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FI900592A FI84666C (fi) 1990-02-07 1990-02-07 Maetkoppling foer smao kapasitanser.

Publications (2)

Publication Number Publication Date
GB9101869D0 GB9101869D0 (en) 1991-03-13
GB2242279A true GB2242279A (en) 1991-09-25

Family

ID=8529843

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9101869A Withdrawn GB2242279A (en) 1990-02-07 1991-01-29 Measuring low capacitances

Country Status (9)

Country Link
AU (1) AU6949191A (fi)
BR (1) BR9100486A (fi)
CA (1) CA2035909A1 (fi)
DE (1) DE4103433A1 (fi)
FI (1) FI84666C (fi)
FR (1) FR2657963A1 (fi)
GB (1) GB2242279A (fi)
IT (1) IT1245137B (fi)
ZA (1) ZA91506B (fi)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8030949B2 (en) * 2008-10-31 2011-10-04 Testo Ag Measurement method for determining moisture content

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19513022C1 (de) * 1995-04-06 1996-08-14 Siemens Ag Schaltungsanordnung und Verfahren zur Bestimmung von Kapazitätsdifferenzen
DE19625666C1 (de) * 1996-06-26 1998-01-15 Siemens Ag Ausleseschaftung und kapazitiv messender Senser
DE102004006020A1 (de) 2004-02-06 2005-08-25 E + E Elektronik Ges.M.B.H. Schaltungsanordnung zur kapazitiven Feuchtemessung und Verfahren zum Betrieb derselben
CN101738422B (zh) * 2009-12-23 2012-09-05 北京宝力马传感技术有限公司 一种湿度测量装置及方法

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4794320A (en) * 1987-08-10 1988-12-27 Moore Products Co. Multi-frequency capacitance sensor

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3886447A (en) * 1972-05-17 1975-05-27 Iwatsu Electric Co Ltd Capacitance-voltage converter
GB2058364B (en) * 1979-09-01 1983-03-23 Ferranti Ltd Capacitance measuring apparatus

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4794320A (en) * 1987-08-10 1988-12-27 Moore Products Co. Multi-frequency capacitance sensor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8030949B2 (en) * 2008-10-31 2011-10-04 Testo Ag Measurement method for determining moisture content

Also Published As

Publication number Publication date
CA2035909A1 (en) 1991-08-08
ITMI910300A1 (it) 1992-08-06
FI84666C (fi) 1991-12-27
ITMI910300A0 (it) 1991-02-06
AU6949191A (en) 1991-08-08
ZA91506B (en) 1991-10-30
IT1245137B (it) 1994-09-13
GB9101869D0 (en) 1991-03-13
FI900592A0 (fi) 1990-02-07
BR9100486A (pt) 1991-10-29
FR2657963A1 (fr) 1991-08-09
FI84666B (fi) 1991-09-13
DE4103433A1 (de) 1991-08-08
FI900592A (fi) 1991-08-08

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)