GB992934A - Improvements in or relating to electric resistance measuring instruments - Google Patents

Improvements in or relating to electric resistance measuring instruments

Info

Publication number
GB992934A
GB992934A GB1793460A GB1793460A GB992934A GB 992934 A GB992934 A GB 992934A GB 1793460 A GB1793460 A GB 1793460A GB 1793460 A GB1793460 A GB 1793460A GB 992934 A GB992934 A GB 992934A
Authority
GB
United Kingdom
Prior art keywords
resistance
measuring
voltage
low
oscillator
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
GB1793460A
Inventor
Francis Giles Hawkins
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.)
NEWPORT INSTR SCIENT AND MOBIL
Original Assignee
NEWPORT INSTR SCIENT AND MOBIL
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 NEWPORT INSTR SCIENT AND MOBIL filed Critical NEWPORT INSTR SCIENT AND MOBIL
Priority to GB1793460A priority Critical patent/GB992934A/en
Publication of GB992934A publication Critical patent/GB992934A/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

Abstract

992, 934. Measuring resistance; electric meters. NEWPORT INSTRUMENT (SCIENTIFIC & MOBILE) Ltd. Aug. 17, 1961 [May 20, 1960], No. 17934/60. Headings G1Q and G1U. [Also in Division H2] In a resistance measuring arrangement which provides a facility for measuring high resistance, an oscillator/rectifier arrangement is included (comprising transistors TR2, TR3 in push pull, transformer T and diodes REC) for generating a high test potential from a low voltage power source BT, the low voltage input to the oscillator being applied by way of a voltage regulating circuit incorporating a transistor TR1. The input to this transistor may be taken from across a Zener diode D1. Facilities are provided for measuring either very high, intermediate or very low resistance across the test terminals TT by setting the range control switch, consisting of four ganged sections SR1-4, appropriately. This control arranges that the supplies for the intermediate and low resistance measurements are taken via the potentiometer networks R4, R5 and R6, R7 respectively from the voltage regulating circuit. The measurement is made using the microammeter M, which is arranged to be in series with the supplies for high and intermediate measurements, but in shunt for the low resistance measurement. The resistor R8 and the Zener diode D2 are connected across the meter to improve the scale shaping thereof. The neon tube N indicates when the high test voltage is present. Specification 912,540 is referred to.
GB1793460A 1960-05-20 1960-05-20 Improvements in or relating to electric resistance measuring instruments Expired GB992934A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1793460A GB992934A (en) 1960-05-20 1960-05-20 Improvements in or relating to electric resistance measuring instruments

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1793460A GB992934A (en) 1960-05-20 1960-05-20 Improvements in or relating to electric resistance measuring instruments

Publications (1)

Publication Number Publication Date
GB992934A true GB992934A (en) 1965-05-26

Family

ID=10103809

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1793460A Expired GB992934A (en) 1960-05-20 1960-05-20 Improvements in or relating to electric resistance measuring instruments

Country Status (1)

Country Link
GB (1) GB992934A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2261075A (en) * 1991-10-31 1993-05-05 Hewlett Packard Co Impedance measurement
CN102662098A (en) * 2012-06-04 2012-09-12 内蒙古自治区计量测试研究院 Method for measuring high voltage and high resistance by means of ratio overlaying

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2261075A (en) * 1991-10-31 1993-05-05 Hewlett Packard Co Impedance measurement
GB2261075B (en) * 1991-10-31 1996-06-12 Hewlett Packard Co Impedance meter
CN102662098A (en) * 2012-06-04 2012-09-12 内蒙古自治区计量测试研究院 Method for measuring high voltage and high resistance by means of ratio overlaying
CN102662098B (en) * 2012-06-04 2015-09-23 内蒙古自治区计量测试研究院 High voltage, high-resistance method is measured with ratio stacked system

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