JPS55143443A - Measuring instrument for electric signal - Google Patents
Measuring instrument for electric signalInfo
- 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
Links
Landscapes
- 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
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)
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 |
-
1978
- 1978-10-12 JP JP12552778A patent/JPS55143443A/en active Pending
Cited By (2)
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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