GB543660A - Improvements in or relating to electrical testing apparatus - Google Patents

Improvements in or relating to electrical testing apparatus

Info

Publication number
GB543660A
GB543660A GB1612740A GB1612740A GB543660A GB 543660 A GB543660 A GB 543660A GB 1612740 A GB1612740 A GB 1612740A GB 1612740 A GB1612740 A GB 1612740A GB 543660 A GB543660 A GB 543660A
Authority
GB
United Kingdom
Prior art keywords
lamp
ammeter
socket
earthing
connection
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
GB1612740A
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.)
RAWNSLEY ALFRED GALE
Original Assignee
RAWNSLEY ALFRED GALE
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 RAWNSLEY ALFRED GALE filed Critical RAWNSLEY ALFRED GALE
Priority to GB1612740A priority Critical patent/GB543660A/en
Publication of GB543660A publication Critical patent/GB543660A/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
    • G01R27/16—Measuring impedance of element or network through which a current is passing from another source, e.g. cable, power line
    • G01R27/18—Measuring resistance to earth, i.e. line to ground

Abstract

543,660. Detecting faults. CONRADI, E. S., and GALE, R. A. Nov. 5, 1940, No. 16127. [Class 37] In apparatus for testing the earthing connections of portable devices, an incandescent lamp or other indicator, such as a voltmeter, is connected in parallel with a source of current supply of which the voltage falls appreciably under a heavy load. A portable cabinet 10 has a non- reversible plug and socket 12 for connection to a mains supply, and a test lead 16 connected to a clip 18 is led through the back wall of the cabinet. The front sloping wall carries a pushbutton switch 20, an incandescent lamp 22, an ammeter 24, and a socket 26 for receiving a three-pin plug of a soldering iron or other device to be tested. Within the cabinet is a loosely coupled step-down transformer 32, Fig. 2, having its primary winding 34 connected to a contactor 38 connected to the terminals 40, 41 of the socket 12 and operated by means of the switch 20. The lamp 22 is connected in parallel with the secondary winding 36 of the transformer 32 and has one terminal 44 connected to the test lead 16 and the other terminal 46 connected through the ammeter 24 to the socket 28 for receiving the earthing pin. The clip 18 is connected to the bit or other conducting part of the device to be tested, If the earthing connection is in order a heavy current is indicated on the ammeter 24 and the secondary voltage of the transformer falls so low that the lamp 22 does not light. If the earthing connection is broken or has a fault such as several broken strands the lamp 22 lights and indicates the fault. The connection between the ammeter 24 and the lamp 22 may be earthed.
GB1612740A 1940-11-05 1940-11-05 Improvements in or relating to electrical testing apparatus Expired GB543660A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1612740A GB543660A (en) 1940-11-05 1940-11-05 Improvements in or relating to electrical testing apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1612740A GB543660A (en) 1940-11-05 1940-11-05 Improvements in or relating to electrical testing apparatus

Publications (1)

Publication Number Publication Date
GB543660A true GB543660A (en) 1942-03-06

Family

ID=10071671

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1612740A Expired GB543660A (en) 1940-11-05 1940-11-05 Improvements in or relating to electrical testing apparatus

Country Status (1)

Country Link
GB (1) GB543660A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2442771A (en) * 1945-03-10 1948-06-08 Jr Joseph H Kirkpatrick Testing device for electric tools and appliances
US2804591A (en) * 1953-12-11 1957-08-27 United States Steel Corp Electrical test apparatus
US3205436A (en) * 1962-02-02 1965-09-07 Thomas M Donahue Method and apparatus for measuring impedance increases in the ground or protective ground wires leading to three-wire prong power receptacles
US3648163A (en) * 1969-12-02 1972-03-07 Sonoco Products Co Electrical ground apparatus for testing the quality of conductors
GB2191591A (en) * 1986-06-10 1987-12-16 Kenure Developments Limited Earth monitoring

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2442771A (en) * 1945-03-10 1948-06-08 Jr Joseph H Kirkpatrick Testing device for electric tools and appliances
US2804591A (en) * 1953-12-11 1957-08-27 United States Steel Corp Electrical test apparatus
US3205436A (en) * 1962-02-02 1965-09-07 Thomas M Donahue Method and apparatus for measuring impedance increases in the ground or protective ground wires leading to three-wire prong power receptacles
US3648163A (en) * 1969-12-02 1972-03-07 Sonoco Products Co Electrical ground apparatus for testing the quality of conductors
GB2191591A (en) * 1986-06-10 1987-12-16 Kenure Developments Limited Earth monitoring

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