JPS55143443A - Measuring instrument for electric signal - Google Patents

Measuring instrument for electric signal

Info

Publication number
JPS55143443A
JPS55143443A JP12552778A JP12552778A JPS55143443A JP S55143443 A JPS55143443 A JP S55143443A JP 12552778 A JP12552778 A JP 12552778A JP 12552778 A JP12552778 A JP 12552778A JP S55143443 A JPS55143443 A JP S55143443A
Authority
JP
Japan
Prior art keywords
current
currents
light emitting
measured current
waveform
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
JP12552778A
Other languages
Japanese (ja)
Inventor
Atsuo Kobayashi
Tadashi Takahashi
Junichi Yoshinaka
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric Co 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP12552778A priority Critical patent/JPS55143443A/en
Publication of JPS55143443A publication Critical patent/JPS55143443A/en
Pending legal-status Critical Current

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  • Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)

Abstract

PURPOSE: To make it possible to measure a waveform completely similar to a measured current waveform without reference to the level of the measured current, by supplying a slight bias current to a light emitting element.
CONSTITUTION: Through light emitting elements 2 of reverse parallel constitution, DC bias currents IB flow respectively and currents i1 and i2 of current IB and superposed measured current (i) flow as each light emitting current. Therefore, currents i1' and i2' corresponding to currents i1 and i2 flow through phototransistors 4 held at the earth potential. Output voltage V obtained by amplifying a voltage across resistance 7 by operational amplifier 9 is sine wave one and has a waveform similar to that of measured current (i).
COPYRIGHT: (C)1980,JPO&Japio
JP12552778A 1978-10-12 1978-10-12 Measuring instrument for electric signal Pending JPS55143443A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12552778A JPS55143443A (en) 1978-10-12 1978-10-12 Measuring instrument for electric signal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12552778A JPS55143443A (en) 1978-10-12 1978-10-12 Measuring instrument for electric signal

Publications (1)

Publication Number Publication Date
JPS55143443A true JPS55143443A (en) 1980-11-08

Family

ID=14912374

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12552778A Pending JPS55143443A (en) 1978-10-12 1978-10-12 Measuring instrument for electric signal

Country Status (1)

Country Link
JP (1) JPS55143443A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0192664A (en) * 1987-10-03 1989-04-11 Ngk Insulators Ltd Voltage detecting device for line
JPH01123159A (en) * 1987-11-06 1989-05-16 Ngk Insulators Ltd Voltage detector for line

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0192664A (en) * 1987-10-03 1989-04-11 Ngk Insulators Ltd Voltage detecting device for line
JPH01123159A (en) * 1987-11-06 1989-05-16 Ngk Insulators Ltd Voltage detector for line

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