JPS6480872A - Current distribution detecting device - Google Patents
Current distribution detecting deviceInfo
- Publication number
- JPS6480872A JPS6480872A JP23983587A JP23983587A JPS6480872A JP S6480872 A JPS6480872 A JP S6480872A JP 23983587 A JP23983587 A JP 23983587A JP 23983587 A JP23983587 A JP 23983587A JP S6480872 A JPS6480872 A JP S6480872A
- Authority
- JP
- Japan
- Prior art keywords
- level
- output
- vco
- current distribution
- pickup coil
- 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
- Testing Electric Properties And Detecting Electric Faults (AREA)
- Measurement Of Current Or Voltage (AREA)
Abstract
PURPOSE:To easily detect a current distribution which varies continuously like the current distribution on an antenna without contacting by driving an alarm means at a frequency corresponding to the level of a signal induced by a pickup coil. CONSTITUTION:The output of the pickup coil 1 composed of a one-turn coil so as to detect only the electromagnetic field at a measurement point is inputted to a VCO (voltage-controlled oscillator) 4 through a rectifying circuit 2 and a smoothing circuit 3 to obtain a rectangular wave output of frequency proportional to the input voltage. A diode 51 is cut off when the output of the VCO 4 is at a H level, so an oscillator 5 oscillates with a time constant determined by the resistance value of a resistor 53 and the electrostatic capacity of a capacity 54, but when the output of the VCO 4 falls to a L level, the diode 51 turns on, so the oscillator stops oscillating. A buzzer Bz is driven with this pulse frequency modulated pulse train and the timbre changes according to the detection level of the pickup coil 1, thereby evaluating consistency, etc., with the excitation wavelength of the antenna.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23983587A JPS6480872A (en) | 1987-09-24 | 1987-09-24 | Current distribution detecting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23983587A JPS6480872A (en) | 1987-09-24 | 1987-09-24 | Current distribution detecting device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6480872A true JPS6480872A (en) | 1989-03-27 |
Family
ID=17050566
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23983587A Pending JPS6480872A (en) | 1987-09-24 | 1987-09-24 | Current distribution detecting device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6480872A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2814242A1 (en) * | 2000-09-19 | 2002-03-22 | France Telecom | Magnetic receiver for chip cards uses voltage controlled oscillator to convert amplitude to frequency |
| CN103149477A (en) * | 2013-02-06 | 2013-06-12 | 重庆市电力公司电力科学研究院 | Grounding grid defect diagnosis method and system utilizing square wave excitation source |
-
1987
- 1987-09-24 JP JP23983587A patent/JPS6480872A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2814242A1 (en) * | 2000-09-19 | 2002-03-22 | France Telecom | Magnetic receiver for chip cards uses voltage controlled oscillator to convert amplitude to frequency |
| WO2002025295A1 (en) * | 2000-09-19 | 2002-03-28 | France Telecom | Device for punctual measurement of a radiofrequency magnetic field with constant amplitude and frequency |
| JP2004510135A (en) * | 2000-09-19 | 2004-04-02 | フランス テレコム | Device for accurate measurement of high-frequency magnetic fields with constant amplitude and frequency |
| CN103149477A (en) * | 2013-02-06 | 2013-06-12 | 重庆市电力公司电力科学研究院 | Grounding grid defect diagnosis method and system utilizing square wave excitation source |
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