JPS5752871A - Emergency position detector - Google Patents

Emergency position detector

Info

Publication number
JPS5752871A
JPS5752871A JP12721980A JP12721980A JPS5752871A JP S5752871 A JPS5752871 A JP S5752871A JP 12721980 A JP12721980 A JP 12721980A JP 12721980 A JP12721980 A JP 12721980A JP S5752871 A JPS5752871 A JP S5752871A
Authority
JP
Japan
Prior art keywords
sensors
voltage drop
potential
comparator
resistor
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
JP12721980A
Other languages
Japanese (ja)
Inventor
Norio Tanaka
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 JP12721980A priority Critical patent/JPS5752871A/en
Publication of JPS5752871A publication Critical patent/JPS5752871A/en
Pending 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

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Locating Faults (AREA)

Abstract

PURPOSE:To enable the operating position to be made clear, by a method wherein resistors having their respective rsistance values are connected to respective contacts in parallel, and the resistance values are measured in a signal-receiving part. CONSTITUTION:When the contact of sensors 2-7 are all closed, one potential of a comparator 16 is the ground potential, whereby all of the contacts are judges to be closed. As an example, when the sensor 5 is opened, a voltage drop occurs owing to a resistor 12 (8XROMEGA). This potential appears on a signal line 8, becoming an input to the comparator 16. A control circuit 18, which is acutated by means of said input, varies a reference voltage 17 in order to detect the voltage drop due to the resistor 12. Because the resistance values of the respective sensors are different from each other, the sensors are also different from each other in, the voltage drop. Setting each resistance value to be an n-th power of 2 permits knowledge of which sensor has operated even when a plurality of sensors are in operation simultaneously.
JP12721980A 1980-09-16 1980-09-16 Emergency position detector Pending JPS5752871A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12721980A JPS5752871A (en) 1980-09-16 1980-09-16 Emergency position detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12721980A JPS5752871A (en) 1980-09-16 1980-09-16 Emergency position detector

Publications (1)

Publication Number Publication Date
JPS5752871A true JPS5752871A (en) 1982-03-29

Family

ID=14954669

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12721980A Pending JPS5752871A (en) 1980-09-16 1980-09-16 Emergency position detector

Country Status (1)

Country Link
JP (1) JPS5752871A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4639712A (en) * 1984-10-25 1987-01-27 Nippondenso Co., Ltd. Sheathed heater
JPH01288595A (en) * 1988-05-17 1989-11-20 Mitsubishi Electric Corp Failure display device
JP2015184049A (en) * 2014-03-20 2015-10-22 日本電気株式会社 Information processing apparatus, diagnostic method, and program

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4639712A (en) * 1984-10-25 1987-01-27 Nippondenso Co., Ltd. Sheathed heater
JPH01288595A (en) * 1988-05-17 1989-11-20 Mitsubishi Electric Corp Failure display device
JP2015184049A (en) * 2014-03-20 2015-10-22 日本電気株式会社 Information processing apparatus, diagnostic method, and program

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