GB856412A - Echometer with frequency transposition - Google Patents

Echometer with frequency transposition

Info

Publication number
GB856412A
GB856412A GB28307/59A GB2830759A GB856412A GB 856412 A GB856412 A GB 856412A GB 28307/59 A GB28307/59 A GB 28307/59A GB 2830759 A GB2830759 A GB 2830759A GB 856412 A GB856412 A GB 856412A
Authority
GB
United Kingdom
Prior art keywords
frequency
echo
cable
pulse
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
GB28307/59A
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 SAS
Original Assignee
Compagnie Generale dElectricite SA
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 Compagnie Generale dElectricite SA filed Critical Compagnie Generale dElectricite SA
Publication of GB856412A publication Critical patent/GB856412A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/08—Locating faults in cables, transmission lines, or networks
    • G01R31/11—Locating faults in cables, transmission lines, or networks using pulse reflection methods

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Resistance Or Impedance (AREA)

Abstract

856,412. Pulse-echo testing systems. COMPAGNIE GENERALE D'ELECTRICITE. Aug. 19,1959 [Sept. 5,1958], No. 28307/59. Class 40(7). In a pulse-echo type of fault detector for electric cables signals due to irregularities in the cable 3 are supplied via a differential coupling device 5 to a stroke device 7 in which pulses from a generator 8 controlled by an oscillator 9 sample the echo signals and supply such samples to the vertical deflection plates of an oscilloscope 14 via amplifier 13. The frequency fr (oscillator 1 and pulse generators 2) of the pulses supplied to the cable and the frequency fe of the oscillator 9 and pulse generator 8 are so chosen with respect to the frequency of the highest spectral component f max in the output of device 7 that f max fr-fe/fr < fe where fr-fe/fr is the ratio in which the frequency of spectral component in the output of device 7 are reduced with respect to those of the echo signal. The horizontal deflection of oscilloscope 14 is produced by a saw tooth wave of frequency fr-fe in generator 12 controlled by a mixer 11 in which the difference signal is produced from the output of oscillators 1 and 9. The cable 3 and the other end of device 5 are terminated in impedances 4, 6 equal to the characteristic impedance of the cable and a measure of the total echo energy may be obtained from an integrating device 10.
GB28307/59A 1958-09-05 1959-08-19 Echometer with frequency transposition Expired GB856412A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR856412X 1958-09-05

Publications (1)

Publication Number Publication Date
GB856412A true GB856412A (en) 1960-12-14

Family

ID=9328855

Family Applications (1)

Application Number Title Priority Date Filing Date
GB28307/59A Expired GB856412A (en) 1958-09-05 1959-08-19 Echometer with frequency transposition

Country Status (1)

Country Link
GB (1) GB856412A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0691546A3 (en) * 1994-07-08 1997-01-15 Fluke Corp Time-domain reflectometer for testing coaxial cables
EP2446284A4 (en) * 2009-06-22 2016-12-28 Utilx Corp On-line time domain reflectometer system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0691546A3 (en) * 1994-07-08 1997-01-15 Fluke Corp Time-domain reflectometer for testing coaxial cables
EP2446284A4 (en) * 2009-06-22 2016-12-28 Utilx Corp On-line time domain reflectometer system

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