GB699632A - Improvements in and relating to electric discharge devices - Google Patents

Improvements in and relating to electric discharge devices

Info

Publication number
GB699632A
GB699632A GB21538/49A GB2153849A GB699632A GB 699632 A GB699632 A GB 699632A GB 21538/49 A GB21538/49 A GB 21538/49A GB 2153849 A GB2153849 A GB 2153849A GB 699632 A GB699632 A GB 699632A
Authority
GB
United Kingdom
Prior art keywords
lamp
radio
noise
current
ballast
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
GB21538/49A
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.)
British Thomson Houston Co Ltd
Original Assignee
British Thomson Houston 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 British Thomson Houston Co Ltd filed Critical British Thomson Houston Co Ltd
Publication of GB699632A publication Critical patent/GB699632A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/70—Lamps with low-pressure unconstricted discharge having a cold pressure < 400 Torr
    • H01J61/72—Lamps with low-pressure unconstricted discharge having a cold pressure < 400 Torr having a main light-emitting filling of easily vaporisable metal vapour, e.g. mercury
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/12—Selection of substances for gas fillings; Specified operating pressure or temperature
    • H01J61/18—Selection of substances for gas fillings; Specified operating pressure or temperature having a metallic vapour as the principal constituent
    • H01J61/20—Selection of substances for gas fillings; Specified operating pressure or temperature having a metallic vapour as the principal constituent mercury vapour

Landscapes

  • Discharge Lamp (AREA)
  • Circuit Arrangements For Discharge Lamps (AREA)

Abstract

699,632. Noise-level measurement. BRITISH THOMSON-HOUSTON CO., Ltd. Aug. 18, 1949 [Aug. 27, 1948], No. 21538/49. Class 37. [Also in Group XL (a)] The Specification as open to inspection under Sect. 91, comprises a circuit for testing discharge lamps to determine the amount of radio-frequency radiation generated including the lamp 1, to which power is supplied from a source of alternating current comprising the shielded conductors 23 and 24 through a transformer 25 and an inductive ballast 26, a bypassing condenser 27 being connected between one terminal of the lamp 1 and ground intermediate the lamp terminal and the ballast 26 to prevent radio-frequency current from appearing in the ballast or power lines. A resistance 28 is provided in series with the lamp 1 and is connected by a shielded cable to the input circuit of the noise meter 29 and to the input circuit of the radio receiver 30. Headphones are connected to either of the instruments. The audio signal produced is brought to the oscilloscope 31 through a condenser 32 where it is seen as short-duration pulses superimposed on the lamp current wave shape. The noise meter 29 shows the microvolt magnitude of the radio frequency picked up. An electronic switch 33 is employed to show alternately lamp voltage and the audio-pulsed current wave shape, so that lamp current, lamp voltage and the radio noise generated by the lamp 1 are seen at the same instant on the screen of the oscilloscope. This subject matter does not appear in the Specification as accepted.
GB21538/49A 1948-08-27 1949-08-18 Improvements in and relating to electric discharge devices Expired GB699632A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US46506A US2714681A (en) 1948-08-27 1948-08-27 Electric discharge device

Publications (1)

Publication Number Publication Date
GB699632A true GB699632A (en) 1953-11-11

Family

ID=21943812

Family Applications (1)

Application Number Title Priority Date Filing Date
GB21538/49A Expired GB699632A (en) 1948-08-27 1949-08-18 Improvements in and relating to electric discharge devices

Country Status (4)

Country Link
US (1) US2714681A (en)
DE (1) DE847936C (en)
FR (1) FR993783A (en)
GB (1) GB699632A (en)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE545445A (en) * 1955-02-23
US2885587A (en) * 1956-06-13 1959-05-05 Westinghouse Electric Corp Low pressure discharge lamp and method
US2901653A (en) * 1957-04-22 1959-08-25 Westinghouse Electric Corp Fluorescent lamp
US3005930A (en) * 1957-08-12 1961-10-24 Westinghouse Electric Corp Electric discharge apparatus
NL246040A (en) * 1958-12-06
DE1100811B (en) * 1959-02-26 1961-03-02 Egyesuelt Izzolampa Argon-Xenon ignition gas mixture for low-pressure mercury vapor fluorescent lamps
US2965786A (en) * 1959-04-30 1960-12-20 Sylvania Electric Prod Calcium halophosphate phosphors
US3444415A (en) * 1965-12-10 1969-05-13 Microdot Inc Fluorescent discharge lamp
US3462631A (en) * 1966-08-30 1969-08-19 Tokyo Shibaura Electric Co Fluorescent lamps
CA969598A (en) * 1971-11-12 1975-06-17 Hitoshi Otsuka Fluorescent tube for lamp
CA971214A (en) * 1971-11-12 1975-07-15 Matsushita Electronics Corporation Fluorescent tube for lamp
WO2003085695A2 (en) * 2002-04-11 2003-10-16 Koninklijke Philips Electronics N.V. Low-pressure mercury vapor discharge lamp
CN100380568C (en) 2002-04-11 2008-04-09 皇家飞利浦电子股份有限公司 Low-pressure mercury vapor discharge lamp
WO2003086789A1 (en) * 2002-04-17 2003-10-23 Continental Teves Ag & Co. Ohg Method for identifying tire characteristics
AU2003260931A1 (en) * 2002-10-04 2004-04-23 Koninklijke Philips Electronics N.V. Low-pressure mercury vapour discharge lamp

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL233305A (en) * 1924-04-01
GB233305A (en) * 1924-04-30 1925-08-27 Philips Nv Improvements in or relating to electric discharge tubes for positive light
US2407379A (en) * 1941-12-22 1946-09-10 Morehouse Walter Bertram Combination bactericidal and illuminating lamp
US2346522A (en) * 1942-05-12 1944-04-11 Hartford Nat Bank & Trust Co Fluorescent lamp

Also Published As

Publication number Publication date
US2714681A (en) 1955-08-02
DE847936C (en) 1952-08-28
FR993783A (en) 1951-11-07

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