JPS57158566A - Live wire current measuring device - Google Patents

Live wire current measuring device

Info

Publication number
JPS57158566A
JPS57158566A JP4521981A JP4521981A JPS57158566A JP S57158566 A JPS57158566 A JP S57158566A JP 4521981 A JP4521981 A JP 4521981A JP 4521981 A JP4521981 A JP 4521981A JP S57158566 A JPS57158566 A JP S57158566A
Authority
JP
Japan
Prior art keywords
current
measured
magnetic field
zero
output
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
JP4521981A
Other languages
Japanese (ja)
Inventor
Tsutomu Kamiebisu
Nobuo Teramoto
Toshiaki Ogura
Takayuki Kato
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.)
TOUYOU TSUUSHINKI KK
Toyo Communication Equipment Co Ltd
Banzai Ltd
Original Assignee
TOUYOU TSUUSHINKI KK
Toyo Communication Equipment Co Ltd
Banzai 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 TOUYOU TSUUSHINKI KK, Toyo Communication Equipment Co Ltd, Banzai Ltd filed Critical TOUYOU TSUUSHINKI KK
Priority to JP4521981A priority Critical patent/JPS57158566A/en
Publication of JPS57158566A publication Critical patent/JPS57158566A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
    • G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
    • G01R15/20—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using galvano-magnetic devices, e.g. Hall-effect devices, i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices
    • G01R15/202—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using galvano-magnetic devices, e.g. Hall-effect devices, i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices using Hall-effect devices

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Current Or Voltage (AREA)

Abstract

PURPOSE:To substantially make zero point adjustment unnecessary, by storing a residual Hall output when a magnetic field is zero, and operating and outputting a difference between said output and a Hall element output in case when a magnetic field by a current to be measured has been applied. CONSTITUTION:When a switch 6 is depressed by setting a current to be measured to zero, that is, by setting a magnetic field B generated by the current to be measured to a zero state, residual potential V0 is stored in a central operation processor 5. Subsequently, when the current to be measured is made to flow, the magnetic field B being proportional to the current to be measured is applied to a Hall element 1, and Hall output voltage VH being proportional to this magnetic field B is sent as a digital value to the central operation processor 5. Subsequently, in the processor 5, a difference between both the voltage is operated, and a result of operation is converted to a value of the current to be measured and is displayed on an indicator 8. In this way, even in case when an ambient temperature is varied quickly, and even if the direction of the current to be measured is varied, a temperature drift is corrected and a current can be measured exactly.
JP4521981A 1981-03-26 1981-03-26 Live wire current measuring device Pending JPS57158566A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4521981A JPS57158566A (en) 1981-03-26 1981-03-26 Live wire current measuring device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4521981A JPS57158566A (en) 1981-03-26 1981-03-26 Live wire current measuring device

Publications (1)

Publication Number Publication Date
JPS57158566A true JPS57158566A (en) 1982-09-30

Family

ID=12713149

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4521981A Pending JPS57158566A (en) 1981-03-26 1981-03-26 Live wire current measuring device

Country Status (1)

Country Link
JP (1) JPS57158566A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02165070A (en) * 1988-12-20 1990-06-26 Fuji Heavy Ind Ltd Abnormality detector for electric circuit
JPH02168172A (en) * 1988-12-21 1990-06-28 Fuji Heavy Ind Ltd Abnormality detecting apparatus of electric circuit
JP2016176739A (en) * 2015-03-19 2016-10-06 日置電機株式会社 Current measurement device

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS503381A (en) * 1973-05-11 1975-01-14
JPS5260144A (en) * 1975-11-12 1977-05-18 Ricoh Co Ltd Automatic control system for toner density of developer

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS503381A (en) * 1973-05-11 1975-01-14
JPS5260144A (en) * 1975-11-12 1977-05-18 Ricoh Co Ltd Automatic control system for toner density of developer

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02165070A (en) * 1988-12-20 1990-06-26 Fuji Heavy Ind Ltd Abnormality detector for electric circuit
JPH02168172A (en) * 1988-12-21 1990-06-28 Fuji Heavy Ind Ltd Abnormality detecting apparatus of electric circuit
JP2016176739A (en) * 2015-03-19 2016-10-06 日置電機株式会社 Current measurement device

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