GB504258A - Electric testing methods and apparatus therefor - Google Patents

Electric testing methods and apparatus therefor

Info

Publication number
GB504258A
GB504258A GB29689/38A GB2968938A GB504258A GB 504258 A GB504258 A GB 504258A GB 29689/38 A GB29689/38 A GB 29689/38A GB 2968938 A GB2968938 A GB 2968938A GB 504258 A GB504258 A GB 504258A
Authority
GB
United Kingdom
Prior art keywords
rectifiers
comparing
circuits
interchanged
rectified
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
GB29689/38A
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.)
Alcatel Lucent Deutschland AG
C Lorenz AG
Original Assignee
Standard Elektrik Lorenz AG
C Lorenz AG
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 Standard Elektrik Lorenz AG, C Lorenz AG filed Critical Standard Elektrik Lorenz AG
Publication of GB504258A publication Critical patent/GB504258A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/22—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using conversion of ac into dc

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Testing Electric Properties And Detecting Electric Faults (AREA)
  • Measurement Of Resistance Or Impedance (AREA)

Abstract

504,258. Current and voltage measarements ; wireless systems. LORENZ AKT.-GES., C. Oct. 13, 1938, No. 29689. Convention date, Oct. 13, 1937. [Class 37] [Also in Group XL] In apparatus for comparing electric quantities, rectifiers or resistances are interchanged with one another in rapid succession in order to eliminate errors due to differencies in their characteristics. A circuit arrangement is shown for comparing alternating currents of two different frequencies as applied, for example, in the wireless direction of vehicles by comparing the field, strength of two differently modulated antenna fields. The received signals are rectified in a receiver E and amplified, and conveyed through a transformer T to resonance circuits S1, S2 tuned to the two frequencies. The voltages arising at the oscillator circuits and the currents produced thereby are rectified by rectifiers G1, G2 and compared by a D.C. indicator I, equality being shown by zero deflection. In order to compensate for differences in the characteristics of the rectifiers G1, G2, these are interchanged in rapid succession by means of a rotating roller or other mechanical switch or by means of electric discharge tubes. The invention is applicable also in circuits in which resistances having differing characteristics are employed.
GB29689/38A 1937-10-13 1938-10-13 Electric testing methods and apparatus therefor Expired GB504258A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE504258X 1937-10-13

Publications (1)

Publication Number Publication Date
GB504258A true GB504258A (en) 1939-04-21

Family

ID=6546170

Family Applications (1)

Application Number Title Priority Date Filing Date
GB29689/38A Expired GB504258A (en) 1937-10-13 1938-10-13 Electric testing methods and apparatus therefor

Country Status (1)

Country Link
GB (1) GB504258A (en)

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