JP2581605Y2 - Non-contact AC voltmeter - Google Patents
Non-contact AC voltmeterInfo
- Publication number
- JP2581605Y2 JP2581605Y2 JP6165492U JP6165492U JP2581605Y2 JP 2581605 Y2 JP2581605 Y2 JP 2581605Y2 JP 6165492 U JP6165492 U JP 6165492U JP 6165492 U JP6165492 U JP 6165492U JP 2581605 Y2 JP2581605 Y2 JP 2581605Y2
- Authority
- JP
- Japan
- Prior art keywords
- pickup
- voltage
- resistors
- shield
- voltmeter
- 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.)
- Expired - Fee Related
Links
Landscapes
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
- Measurement Of Current Or Voltage (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本考案は交流電圧測定計に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an AC voltmeter.
【０００２】[0002]
【従来の技術】従来、交流商用電圧の測定は、トランス
を利用するか（図３）、抵抗を利用して（図４）行なわ
れていた。2. Description of the Related Art Hitherto, the measurement of an AC commercial voltage has been performed using a transformer (FIG. 3) or using a resistor (FIG. 4).
【０００３】[0003]
【考案が解決しようとする課題】上述した従来の、交流
電圧測定方法は、いずれも交流商用電圧ラインにトラン
スなり抵抗なりを接続するために、安全性に問題があっ
た。The above-mentioned conventional methods for measuring the AC voltage all have a problem in safety because a transformer or a resistor is connected to the AC commercial voltage line.
【０００４】本考案の目的は、電線の被覆の上から交流
電圧を測定する非接触交流電圧計を提供することであ
る。[0004] An object of the present invention is to provide a non-contact AC voltmeter for measuring an AC voltage from over a wire covering.
【０００５】[0005]
【課題を解決するための手段】本考案の非接触交流電圧
計は、交流電圧ラインの被覆をおおうピックアップと、
前記ピックアップをおおうシールドと、前記ピックアッ
プと接地の間に互いに直列に接続された２つの抵抗と、
入力側が前記２つの抵抗の接続点に接続され、出力側が
前記シールドに接続され、増器度が前記２つの抵抗によ
る分圧比の逆数に等しい演算増幅器とを含み、該演算増
幅器の出力を計測点とする。According to the present invention, there is provided a contactless AC voltmeter comprising: a pickup covering an AC voltage line;
A shield covering the pickup, two resistors connected in series with each other between the pickup and ground,
An input side connected to a connection point of the two resistors, an output side connected to the shield, and an operational amplifier having an amplifying degree equal to a reciprocal of a voltage division ratio of the two resistors, and measuring an output of the operational amplifier at a measuring point. And
【０００６】[0006]
【作用】電線の被覆の上から交流電圧を測定するので、
安全性に優れる。[Function] Since the AC voltage is measured from the wire covering,
Excellent safety.
【０００７】[0007]
【実施例】次に、本考案の実施例について図面を参照し
て説明する。Next, an embodiment of the present invention will be described with reference to the drawings.
【０００８】図１は本考案の一実施例の非接触交流電圧
計の構成図、図２はその等価回路図である。FIG. 1 is a configuration diagram of a contactless AC voltmeter according to an embodiment of the present invention, and FIG. 2 is an equivalent circuit diagram thereof.
【０００９】交流商用ライン６（交流電圧ＶAC）の被覆
７にはピックアップ１が被せられ、ピックアップ１の上
にシールド２が被せられている。ピックアップ１と接地
の間には抵抗３と抵抗４が互いに直列に接続されてい
る。抵抗３と抵抗４の接続点に演算増幅器５の入力側
が、シールド２に演算増幅器５の出力側が接続されてい
る。ここで、交流商用ライン６とピックアップ１の間の
見かけの容量をＣ1 ，ピックアップ１とシールド２の間
の見かけの容量をＣ2 ，シールド２と接地の間の容量を
Ｃ3 とする。また、抵抗３、抵抗４の抵抗値をそれぞれ
Ｒ1，Ｒ2とする。抵抗３と抵抗４の接続点８の電位Ｖ2
は である。ここで、演算増幅器５の増幅度は１／ＡＴＴに
定められている。したがって、演算増幅器５の出力電圧
Ｖ3 は である。ピックアップ１の電位Ｖ1＝Ｖ3であるから、ピ
ックアップ１とシールド２の間は容量Ｃ2 は見かけ上な
くなる。したがって、交流電圧ＶAC を、演算増幅器５
の出力電圧Ｖ3 から正確に測定できる。A pickup 1 is covered on a covering 7 of an AC commercial line 6 (AC voltage VAC), and a shield 2 is covered on the pickup 1. A resistor 3 and a resistor 4 are connected in series between the pickup 1 and the ground. The input side of the operational amplifier 5 is connected to the connection point between the resistors 3 and 4, and the output side of the operational amplifier 5 is connected to the shield 2. Here, AC apparent capacitance C 1 between the commercial line 6 and the pickup 1, a pickup 1 and C 2 an apparent capacitance between the shield 2, the capacitance between the shield 2 and the ground and C 3. The resistance values of the resistors 3 and 4 are R 1 and R 2 , respectively. The potential V 2 at the connection point 8 between the resistors 3 and 4
Is It is. Here, the amplification degree of the operational amplifier 5 is set to 1 / ATT. Therefore, the output voltage V 3 of the operational amplifier 5 becomes It is. Since the electric potential V 1 of the pickup 1 is V 3 = V 3 , the capacitance C 2 disappears between the pickup 1 and the shield 2. Therefore, an AC voltage V AC, the operational amplifier 5
It can be accurately measured from the output voltage V 3.
【００１０】[0010]
【考案の効果】以上説明したように本考案は、ピックア
ップとシールドと抵抗と演算増幅器を用いて交流電圧を
非接触に測定することにより、交流電圧を安全に測定で
きるという効果がある。As described above, the present invention has an effect that the AC voltage can be measured safely by contactlessly measuring the AC voltage using the pickup, the shield, the resistor, and the operational amplifier.
【図１】本考案の一実施例の非接触交流電圧計の構成図
である。FIG. 1 is a configuration diagram of a non-contact AC voltmeter according to an embodiment of the present invention.
【図２】図１の非接触交流電圧計の等価回路図である。FIG. 2 is an equivalent circuit diagram of the non-contact AC voltmeter of FIG.
【図３】交流電圧の従来の測定方法の一例を示す図であ
る。FIG. 3 is a diagram showing an example of a conventional method for measuring an AC voltage.
【図４】交流電圧の従来の測定方法の一例を示す図であ
る。FIG. 4 is a diagram showing an example of a conventional method for measuring an AC voltage.
１ ピックアップ ２ シールド ３，４ 抵抗 ５ 演算増幅器 ６ 交流商用ライン ７ 被覆 ８ 抵抗３と抵抗４の接続点 ＶAC 交流電圧 Ｒ1，Ｒ2 抵抗値 Ｖ1，Ｖ2，Ｖ3 電圧 Ｃ1，Ｃ2，Ｃ3 容量1 pickup 2 shielded 3,4 resistors 5 operational amplifier 6 AC connection point V AC alternating voltage R 1 of the commercial line 7 covering 8 resistors 3 and 4, R 2 the resistance value V 1, V 2, V 3 voltage C 1, C 2 , C 3 capacity
Claims (1)
ップと、前記ピックアップをおおうシールドと、前記ピ
ックアップと接地の間に互いに直列に接続された２つの
抵抗と、入力側が前記２つの抵抗の接続点に接続され、
出力側が前記シールドに接続され、増幅度が前記２つの
抵抗による分圧比の逆数に等しい演算増幅器とを含み、
該演算増幅器の出力を計測点とする非接触交流電圧計。1. A pickup covering an AC voltage line, a shield covering the pickup, two resistors connected in series between the pickup and ground, and an input side connected to a connection point of the two resistors. Connected
An output amplifier connected to the shield and having an amplification degree equal to the reciprocal of a voltage division ratio of the two resistors,
A non-contact AC voltmeter using the output of the operational amplifier as a measurement point.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6165492U JP2581605Y2 (en) | 1992-09-01 | 1992-09-01 | Non-contact AC voltmeter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6165492U JP2581605Y2 (en) | 1992-09-01 | 1992-09-01 | Non-contact AC voltmeter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0628748U JPH0628748U (en) | 1994-04-15 |
| JP2581605Y2 true JP2581605Y2 (en) | 1998-09-24 |
Family
ID=13177433
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6165492U Expired - Fee Related JP2581605Y2 (en) | 1992-09-01 | 1992-09-01 | Non-contact AC voltmeter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2581605Y2 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4330256B2 (en) * | 2000-08-09 | 2009-09-16 | 大阪瓦斯株式会社 | Non-contact voltage measuring method and apparatus |
| JP5777600B2 (en) * | 2012-12-18 | 2015-09-09 | 日本電信電話株式会社 | Non-contact voltage measurement probe |
| JP6343984B2 (en) * | 2014-03-13 | 2018-06-20 | オムロン株式会社 | Non-contact voltage measuring device |
| US10139435B2 (en) | 2016-11-11 | 2018-11-27 | Fluke Corporation | Non-contact voltage measurement system using reference signal |
| US10352967B2 (en) | 2016-11-11 | 2019-07-16 | Fluke Corporation | Non-contact electrical parameter measurement systems |
| US10120021B1 (en) | 2017-06-16 | 2018-11-06 | Fluke Corporation | Thermal non-contact voltage and non-contact current devices |
| US10509063B2 (en) | 2017-11-28 | 2019-12-17 | Fluke Corporation | Electrical signal measurement device using reference signal |
-
1992
- 1992-09-01 JP JP6165492U patent/JP2581605Y2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0628748U (en) | 1994-04-15 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 19980609 |
|
| R250 | Receipt of annual fees |
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|
| R250 | Receipt of annual fees |
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|
| R250 | Receipt of annual fees |
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|
| LAPS | Cancellation because of no payment of annual fees |