GB1496151A - Signal measuring apparatus - Google Patents

Signal measuring apparatus

Info

Publication number
GB1496151A
GB1496151A GB1991/74A GB199174A GB1496151A GB 1496151 A GB1496151 A GB 1496151A GB 1991/74 A GB1991/74 A GB 1991/74A GB 199174 A GB199174 A GB 199174A GB 1496151 A GB1496151 A GB 1496151A
Authority
GB
United Kingdom
Prior art keywords
generator
averages
sweep
averaged
successive
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
GB1991/74A
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.)
Telephone Cables Ltd
Original Assignee
Telephone Cables 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 Telephone Cables Ltd filed Critical Telephone Cables Ltd
Priority to GB1991/74A priority Critical patent/GB1496151A/en
Publication of GB1496151A publication Critical patent/GB1496151A/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
    • 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
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/58—Testing of lines, cables or conductors

Landscapes

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

Abstract

1496151 Testing cables TELEPHONE CABLES Ltd 16 Jan 1975 [16 Jan 1974] 01991/74 Heading G1U A cable testing system of the type in which the output of a sweep generator 1, Fig.1, is pulse modulated 3, and the resulting bursts of oscillations are passed 4 to a cable 2 under test, is characterized in that the power 10 in the reflected signals is averaged 12 over successive periods of duration T corresponding to the time for the sweep generator to rise through a frequency of #f (#f = 1Mc/s as described), and successive averages are themselves averaged 14 in groups of n (n = 10 as described) so as to provide a sequence of moving averages each occurring following a change of #f in the sweep generator and being evaluated over the immediately preceeding n. #f sweep of the generator. The moving averages can be displayed or stored 20. Control of the averaging processes is by a clockpulse generator 16 (see Fig. 3 not shown, for details) which derives one clockpulse from the output of the sweep generator each time it passes through a harmonic of a 1Mc/s beat oscillator. The resulting clockpulses, of period T, are used to control an integrator 22 and a variable gain amplifier 26 (Fig. 3), and also, via a counter 32, the transmission of successive 1Mc/s averages to capacitor stores 28, the signals on which are further averaged, by an operational amplifier 34, to provide the required moving averages.
GB1991/74A 1975-01-16 1975-01-16 Signal measuring apparatus Expired GB1496151A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1991/74A GB1496151A (en) 1975-01-16 1975-01-16 Signal measuring apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1991/74A GB1496151A (en) 1975-01-16 1975-01-16 Signal measuring apparatus

Publications (1)

Publication Number Publication Date
GB1496151A true GB1496151A (en) 1977-12-30

Family

ID=9731682

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1991/74A Expired GB1496151A (en) 1975-01-16 1975-01-16 Signal measuring apparatus

Country Status (1)

Country Link
GB (1) GB1496151A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2166249A (en) * 1984-10-26 1986-04-30 Exxon Production Research Co Determining electrical properties of rock
GB2317707A (en) * 1996-09-24 1998-04-01 Whitaker Corp Cable testing arrangement

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2166249A (en) * 1984-10-26 1986-04-30 Exxon Production Research Co Determining electrical properties of rock
US4626773A (en) * 1984-10-26 1986-12-02 Exxon Production Research Co. Method and means for determining rock properties using time-domain dielectric spectroscopy
GB2317707A (en) * 1996-09-24 1998-04-01 Whitaker Corp Cable testing arrangement

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee