GB887587A - Improvements relating to electrical resistance measuring instruments - Google Patents

Improvements relating to electrical resistance measuring instruments

Info

Publication number
GB887587A
GB887587A GB4109258A GB4109258A GB887587A GB 887587 A GB887587 A GB 887587A GB 4109258 A GB4109258 A GB 4109258A GB 4109258 A GB4109258 A GB 4109258A GB 887587 A GB887587 A GB 887587A
Authority
GB
United Kingdom
Prior art keywords
resistor
voltage
electrical resistance
dec
measuring instruments
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
GB4109258A
Inventor
Robert James Redding
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.)
Evershed and Vignoles Ltd
Original Assignee
Evershed and Vignoles 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 Evershed and Vignoles Ltd filed Critical Evershed and Vignoles Ltd
Priority to GB4109258A priority Critical patent/GB887587A/en
Publication of GB887587A publication Critical patent/GB887587A/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
    • G01R27/025—Measuring very high resistances, e.g. isolation resistances, i.e. megohm-meters

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Resistance Or Impedance (AREA)

Abstract

887,587. Resistance measurement. EVERSHED & VIGNOLES Ltd. Dec. 11, 1959 [Dec. 19, 1958], No. 41092/58. Class 37. Insulation resistance is measured by applying stabilized direct voltage from rectifier circuit 2 through the test circuit 3 in series with standard resistor 4 and feed-back resistor 5 ; bridged by short-circuiting switch 6. Amplifier 7 is energized from the voltage across resistor 4 and develops output across resistors 5, 8 in series ; the respective values being adjusted so that the voltage across 5 is equal and opposite to that across 4. Initially, switch 6 is closed until circuit 3 is fully charged, and is opened without further disturbance since points P, Q are at the same potential; the voltage across resistor 4 being indicated by instrument 9 as a measure of the insulation resistance of 3. Specification 845,291 is referred to.
GB4109258A 1958-12-19 1958-12-19 Improvements relating to electrical resistance measuring instruments Expired GB887587A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB4109258A GB887587A (en) 1958-12-19 1958-12-19 Improvements relating to electrical resistance measuring instruments

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4109258A GB887587A (en) 1958-12-19 1958-12-19 Improvements relating to electrical resistance measuring instruments

Publications (1)

Publication Number Publication Date
GB887587A true GB887587A (en) 1962-01-17

Family

ID=10418089

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4109258A Expired GB887587A (en) 1958-12-19 1958-12-19 Improvements relating to electrical resistance measuring instruments

Country Status (1)

Country Link
GB (1) GB887587A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2138576A (en) * 1982-12-10 1984-10-24 Trolex Prod Ltd Impedance sensor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2138576A (en) * 1982-12-10 1984-10-24 Trolex Prod Ltd Impedance sensor

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