GB519693A - Improvements relating to electrical measuring instruments - Google Patents

Improvements relating to electrical measuring instruments

Info

Publication number
GB519693A
GB519693A GB2793138A GB2793138A GB519693A GB 519693 A GB519693 A GB 519693A GB 2793138 A GB2793138 A GB 2793138A GB 2793138 A GB2793138 A GB 2793138A GB 519693 A GB519693 A GB 519693A
Authority
GB
United Kingdom
Prior art keywords
resistance
cable
instrument
current
circuit
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
GB2793138A
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.)
RALPH TYRRELL WRIGHT
Evershed and Vignoles Ltd
Original Assignee
RALPH TYRRELL WRIGHT
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 RALPH TYRRELL WRIGHT, Evershed and Vignoles Ltd filed Critical RALPH TYRRELL WRIGHT
Priority to GB2793138A priority Critical patent/GB519693A/en
Publication of GB519693A publication Critical patent/GB519693A/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

519,693. Resistance measurements. EVERSHED & VIGNOLES, Ltd., and WRIGHT, R. T. Sept. 24, 1938, No. 27931. [Class 37] Apparatus for the measurement of high resistances includes an instrument for measuring the current flowing in the resistance and a device possessing unilateral conductivity connected in the current circuit. A D.C. generator a driven by hand or sychronous motor has a smoothing condenser b across its terminals and is connected through the deflection coil d of a crossed-coil instrument c, d to the resistance R to be measured, which may be the insulation resistance of a cable having considerable capacitance g. A half -wave rectifier h of the oxide-film type is connected in the circuit and is so directed as to oppose only small resistance to the charging current to the resistance R, but a high resistance to the discharge current. The cable is thus charged in a short time, while fluctuations in the instrument reading due to slight voltage fluctuations are minimized. A switch s enables the cable to be discharged through a resistance r after testing.
GB2793138A 1938-09-24 1938-09-24 Improvements relating to electrical measuring instruments Expired GB519693A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2793138A GB519693A (en) 1938-09-24 1938-09-24 Improvements relating to electrical measuring instruments

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2793138A GB519693A (en) 1938-09-24 1938-09-24 Improvements relating to electrical measuring instruments

Publications (1)

Publication Number Publication Date
GB519693A true GB519693A (en) 1940-04-03

Family

ID=10267583

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2793138A Expired GB519693A (en) 1938-09-24 1938-09-24 Improvements relating to electrical measuring instruments

Country Status (1)

Country Link
GB (1) GB519693A (en)

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