GB1068917A - Impedance-measuring apparatus - Google Patents

Impedance-measuring apparatus

Info

Publication number
GB1068917A
GB1068917A GB324165A GB324165A GB1068917A GB 1068917 A GB1068917 A GB 1068917A GB 324165 A GB324165 A GB 324165A GB 324165 A GB324165 A GB 324165A GB 1068917 A GB1068917 A GB 1068917A
Authority
GB
United Kingdom
Prior art keywords
resistor
impedance
impedances
bridge
ratio
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.)
Expired
Application number
GB324165A
Inventor
Francis Burnard Jones
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.)
International Research and Development Co Ltd
Original Assignee
International Research and Development Co Ltd
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 International Research and Development Co Ltd filed Critical International Research and Development Co Ltd
Priority to GB324165A priority Critical patent/GB1068917A/en
Publication of GB1068917A publication Critical patent/GB1068917A/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
    • G01R27/08—Measuring resistance by measuring both voltage and current
    • G01R27/10—Measuring resistance by measuring both voltage and current using two-coil or crossed-coil instruments forming quotient
    • G01R27/12—Measuring resistance by measuring both voltage and current using two-coil or crossed-coil instruments forming quotient using hand generators, e.g. meggers

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
  • Measurement Of Resistance Or Impedance (AREA)

Abstract

1,068,917. Impedance measuring apparatus. INTERNATIONAL RESEARCH & DEVELOPMENT CO. Ltd. Jan. is, 1966 [Jan. 25, 1965], No. 3241/65. Heading G1U. In an apparatus for measuring the ratio of two impedances, the impedances 1, 2 are connected in two arms of a bridge circuit, of which one of the other arms includes a current sensitive resistor 6, e.g. a thermistor or varistor, and the other a comparison resistor 7. The output of the bridge 10, 11 is connected via a tuned circuit 12 and an amplifier 5 to the bridge input 3, 4 the arrangement being such that for any given ratio of the impedances 1, 2 a stable oscillatory condition is reached in which the current through the resistor 6 is such as to produce a nearly balanced condition of the bridge. The impedance ratio is then indicated as a function of the amplifier output voltage by a meter 15. As described with reference to Fig. 1, the impedance 2 is fixed, and impedance 1 variable. In a modification Fig. 2 (not shown) the two impedances are both variable and comprise a pair of inductances (16, 17) mutually coupled to a movable coil (18) to form a strain gauge. When resistor 6 is a temperature sensitive resistor, resistor 7 may also include a temperature sensitive element to provide compensation.
GB324165A 1965-01-25 1965-01-25 Impedance-measuring apparatus Expired GB1068917A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB324165A GB1068917A (en) 1965-01-25 1965-01-25 Impedance-measuring apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB324165A GB1068917A (en) 1965-01-25 1965-01-25 Impedance-measuring apparatus

Publications (1)

Publication Number Publication Date
GB1068917A true GB1068917A (en) 1967-05-17

Family

ID=9754618

Family Applications (1)

Application Number Title Priority Date Filing Date
GB324165A Expired GB1068917A (en) 1965-01-25 1965-01-25 Impedance-measuring apparatus

Country Status (1)

Country Link
GB (1) GB1068917A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4190796A (en) * 1977-06-02 1980-02-26 Tokyo Shibaura Electric Company, Limited Pressure detecting apparatus having linear output characteristic

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4190796A (en) * 1977-06-02 1980-02-26 Tokyo Shibaura Electric Company, Limited Pressure detecting apparatus having linear output characteristic

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