JPS51136225A - Relay device monitoring - Google Patents

Relay device monitoring

Info

Publication number
JPS51136225A
JPS51136225A JP5974575A JP5974575A JPS51136225A JP S51136225 A JPS51136225 A JP S51136225A JP 5974575 A JP5974575 A JP 5974575A JP 5974575 A JP5974575 A JP 5974575A JP S51136225 A JPS51136225 A JP S51136225A
Authority
JP
Japan
Prior art keywords
relay device
device monitoring
pecutiar
wave
frequency signal
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.)
Pending
Application number
JP5974575A
Other languages
Japanese (ja)
Inventor
Hikari Taniguchi
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 JP5974575A priority Critical patent/JPS51136225A/en
Publication of JPS51136225A publication Critical patent/JPS51136225A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/40—Monitoring; Testing of relay systems

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Monitoring And Testing Of Transmission In General (AREA)

Abstract

PURPOSE:Relay device monitoring by higher frequency signal than conventional using wave detecting characteristics pecutiar to frequency modulated wave.
JP5974575A 1975-05-21 1975-05-21 Relay device monitoring Pending JPS51136225A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5974575A JPS51136225A (en) 1975-05-21 1975-05-21 Relay device monitoring

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5974575A JPS51136225A (en) 1975-05-21 1975-05-21 Relay device monitoring

Publications (1)

Publication Number Publication Date
JPS51136225A true JPS51136225A (en) 1976-11-25

Family

ID=13122065

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5974575A Pending JPS51136225A (en) 1975-05-21 1975-05-21 Relay device monitoring

Country Status (1)

Country Link
JP (1) JPS51136225A (en)

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