JPS643571A - Tdr device - Google Patents

Tdr device

Info

Publication number
JPS643571A
JPS643571A JP15766987A JP15766987A JPS643571A JP S643571 A JPS643571 A JP S643571A JP 15766987 A JP15766987 A JP 15766987A JP 15766987 A JP15766987 A JP 15766987A JP S643571 A JPS643571 A JP S643571A
Authority
JP
Japan
Prior art keywords
sampling
waveform
pulses
frequencies
sampling clock
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.)
Granted
Application number
JP15766987A
Other languages
Japanese (ja)
Other versions
JPH0682140B2 (en
Inventor
Toshiaki Ueno
Fumio Ikeuchi
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP15766987A priority Critical patent/JPH0682140B2/en
Publication of JPS643571A publication Critical patent/JPS643571A/en
Publication of JPH0682140B2 publication Critical patent/JPH0682140B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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  • Measurement Of Resistance Or Impedance (AREA)

Abstract

PURPOSE:To improve accuracy by synchronizing the phases of the frequencies generated by test pulses and sampling frequencies by each other. CONSTITUTION:The rest pulses from a pulse generator 9 are supplied to an object 30 to be measured via a coaxial cable 10. Reflections arise according to magnitudes if the impedance is different from the impedance of an object 30 to be measured. The reflection pulses and the test pulses are sampled by a sampling head 12. The output frequencies of frequency synthesizers (1) 11, (2) 14 synchronize the mutual phases when a reference signal is supplied from a reference signal oscillator 15. A sampling clock generator 13 generates the sampling clock to the head 12. The sampling waveform converted to a low speed is amplified by an amplifier 16. The decrease in the hold waveform is prevented by a sample/hold circuit 17. The waveform is further converted by an A/D converter 18 in synchronization with the sampling clock. The output data of the converter 18 is subjected to waveform analysis by a computer 20. The accuracy is thus improved.
JP15766987A 1987-06-26 1987-06-26 TDR device Expired - Lifetime JPH0682140B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15766987A JPH0682140B2 (en) 1987-06-26 1987-06-26 TDR device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15766987A JPH0682140B2 (en) 1987-06-26 1987-06-26 TDR device

Publications (2)

Publication Number Publication Date
JPS643571A true JPS643571A (en) 1989-01-09
JPH0682140B2 JPH0682140B2 (en) 1994-10-19

Family

ID=15654791

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15766987A Expired - Lifetime JPH0682140B2 (en) 1987-06-26 1987-06-26 TDR device

Country Status (1)

Country Link
JP (1) JPH0682140B2 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02292919A (en) * 1989-04-03 1990-12-04 Internatl Business Mach Corp <Ibm> System and method for measuring characteristics of communication cable
US5457990A (en) * 1991-12-03 1995-10-17 Cambridge Consultants Limited Method and apparatus for determining a fluid level in the vicinity of a transmission line
JPH1054864A (en) * 1996-08-08 1998-02-24 Mitsubishi Cable Ind Ltd Method for diagnosing deterioration of cable
JP2011509035A (en) * 2008-01-03 2011-03-17 コミッサリア ア レネルジー アトミーク エ オ ゼネルジ ザルタナテイヴ Method for detecting and locating faults in wired electrical networks by reflectometry and corresponding apparatus
JP2013029351A (en) * 2011-07-27 2013-02-07 Kazuo Yamamoto Disconnection detection device for lightning protection conductor for windmill blade
JP2015091087A (en) * 2013-11-07 2015-05-11 三菱電機株式会社 Package internal voltage waveform measuring device, internal voltage waveform calculation device, package internal voltage waveform measuring system, internal voltage waveform calculation method and internal voltage waveform calculation program

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02292919A (en) * 1989-04-03 1990-12-04 Internatl Business Mach Corp <Ibm> System and method for measuring characteristics of communication cable
US5457990A (en) * 1991-12-03 1995-10-17 Cambridge Consultants Limited Method and apparatus for determining a fluid level in the vicinity of a transmission line
JPH1054864A (en) * 1996-08-08 1998-02-24 Mitsubishi Cable Ind Ltd Method for diagnosing deterioration of cable
JP2011509035A (en) * 2008-01-03 2011-03-17 コミッサリア ア レネルジー アトミーク エ オ ゼネルジ ザルタナテイヴ Method for detecting and locating faults in wired electrical networks by reflectometry and corresponding apparatus
JP2013029351A (en) * 2011-07-27 2013-02-07 Kazuo Yamamoto Disconnection detection device for lightning protection conductor for windmill blade
JP2015091087A (en) * 2013-11-07 2015-05-11 三菱電機株式会社 Package internal voltage waveform measuring device, internal voltage waveform calculation device, package internal voltage waveform measuring system, internal voltage waveform calculation method and internal voltage waveform calculation program

Also Published As

Publication number Publication date
JPH0682140B2 (en) 1994-10-19

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