GB2223379B - Bell capacitance measuring circuit - Google Patents

Bell capacitance measuring circuit

Info

Publication number
GB2223379B
GB2223379B GB8921652A GB8921652A GB2223379B GB 2223379 B GB2223379 B GB 2223379B GB 8921652 A GB8921652 A GB 8921652A GB 8921652 A GB8921652 A GB 8921652A GB 2223379 B GB2223379 B GB 2223379B
Authority
GB
United Kingdom
Prior art keywords
bell
measuring circuit
capacitance measuring
capacitance
circuit
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 - Lifetime
Application number
GB8921652A
Other versions
GB2223379A (en
GB8921652D0 (en
Inventor
Alexander J Binnie
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.)
Rolls Royce Power Engineering PLC
Spirent Systems Ltd
Original Assignee
Northern Engineering Industries PLC
Edgcumbe Instruments 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 Northern Engineering Industries PLC, Edgcumbe Instruments Ltd filed Critical Northern Engineering Industries PLC
Publication of GB8921652D0 publication Critical patent/GB8921652D0/en
Publication of GB2223379A publication Critical patent/GB2223379A/en
Application granted granted Critical
Publication of GB2223379B publication Critical patent/GB2223379B/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
    • G01R27/2605—Measuring capacitance
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/24—Arrangements for testing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/22—Arrangements for supervision, monitoring or testing
    • H04M3/26—Arrangements for supervision, monitoring or testing with means for applying test signals or for measuring
    • H04M3/28—Automatic routine testing ; Fault testing; Installation testing; Test methods, test equipment or test arrangements therefor
    • H04M3/30—Automatic routine testing ; Fault testing; Installation testing; Test methods, test equipment or test arrangements therefor for subscriber's lines, for the local loop
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/02—Calling substations, e.g. by ringing
GB8921652A 1988-09-28 1989-09-26 Bell capacitance measuring circuit Expired - Lifetime GB2223379B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB888822755A GB8822755D0 (en) 1988-09-28 1988-09-28 Bell capacitance measuring circuit

Publications (3)

Publication Number Publication Date
GB8921652D0 GB8921652D0 (en) 1989-11-08
GB2223379A GB2223379A (en) 1990-04-04
GB2223379B true GB2223379B (en) 1992-12-09

Family

ID=10644383

Family Applications (2)

Application Number Title Priority Date Filing Date
GB888822755A Pending GB8822755D0 (en) 1988-09-28 1988-09-28 Bell capacitance measuring circuit
GB8921652A Expired - Lifetime GB2223379B (en) 1988-09-28 1989-09-26 Bell capacitance measuring circuit

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB888822755A Pending GB8822755D0 (en) 1988-09-28 1988-09-28 Bell capacitance measuring circuit

Country Status (1)

Country Link
GB (2) GB8822755D0 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2269073B (en) * 1992-07-23 1996-06-19 Northern Telecom Ltd Remote line tester
GB2310571B (en) * 1996-02-21 2000-06-28 Dsc Communications Testing a subscriber terminal of a wireless telecommunications system
CN101035178B (en) 2006-03-10 2010-06-09 华为技术有限公司 Remote power supply system, online detection method of the remote power and remote power supply method

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1385168A (en) * 1973-05-04 1975-02-26 Standard Telephones Cables Ltd Circuits and methods for measuring capacitance

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1385168A (en) * 1973-05-04 1975-02-26 Standard Telephones Cables Ltd Circuits and methods for measuring capacitance

Also Published As

Publication number Publication date
GB8822755D0 (en) 1988-11-02
GB2223379A (en) 1990-04-04
GB8921652D0 (en) 1989-11-08

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Legal Events

Date Code Title Description
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PE20 Patent expired after termination of 20 years

Expiry date: 20090925