JPH05288788A - Measurement system resistance against electrical noise - Google Patents
Measurement system resistance against electrical noiseInfo
- Publication number
- JPH05288788A JPH05288788A JP11974792A JP11974792A JPH05288788A JP H05288788 A JPH05288788 A JP H05288788A JP 11974792 A JP11974792 A JP 11974792A JP 11974792 A JP11974792 A JP 11974792A JP H05288788 A JPH05288788 A JP H05288788A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- optical
- electrical noise
- transmission line
- under test
- 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.)
- Withdrawn
Links
- 238000005259 measurement Methods 0.000 title claims abstract description 39
- 238000012360 testing method Methods 0.000 claims abstract description 54
- 230000008054 signal transmission Effects 0.000 claims abstract description 26
- 239000013307 optical fiber Substances 0.000 claims abstract description 9
- 230000003287 optical effect Effects 0.000 claims description 45
- 230000005540 biological transmission Effects 0.000 claims description 30
- 230000000694 effects Effects 0.000 abstract description 2
- 230000000644 propagated effect Effects 0.000 description 13
- 238000010586 diagram Methods 0.000 description 6
- 239000000470 constituent Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000004020 conductor Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000012811 non-conductive material Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001902 propagating effect Effects 0.000 description 1
Landscapes
- Testing Electric Properties And Detecting Electric Faults (AREA)
Abstract
(57)【要約】 （修正有）
【目的】 被測定装置と測定装置との間でノイズが直接
伝播することのない、新規な測定系を提供すること。
【構成】 被測定装置１に対して電気的ノイズを印加す
ることができる電気的ノイズ印加装置４と、信号発生器
21により発生した試験信号を被測定装置１を経由して信
号受信器22に受け、被測定装置１に対する電気的ノイズ
の影響を測定することができる測定装置２とを含む測定
系において、該測定装置２と被測定装置１とを結合する
信号伝送路５の一部が、光ファイバ52、55等により形成
された非導電性の信号伝送路５で構成されている。
(57) [Summary] (Modified) [Purpose] To provide a new measurement system in which noise does not directly propagate between the device under test and the measuring device. An electrical noise applying device 4 capable of applying electrical noise to a device under test 1, and a signal generator.
In a measurement system including a measurement device 2 that receives a test signal generated by the device 21 via the device under test 1 and receives the signal receiver 22 to measure the effect of electrical noise on the device under test 1, A part of the signal transmission line 5 that connects the device 2 and the device under test 1 is composed of the non-conductive signal transmission line 5 formed by the optical fibers 52, 55 and the like.
Description
【０００１】[0001]
【産業上の利用分野】本発明は電気的ノイズに対する耐
性の測定系に関する。より詳細には、本発明は、電気的
ノイズに対するデータ伝送装置またはデータ処理装置の
耐性を測定するために使用する測定系であって、特に、
測定装置の保護を目的とした改善がなされた新規な測定
系の構成に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system for measuring resistance to electrical noise. More particularly, the invention relates to a measurement system used for measuring the resistance of a data transmission device or a data processing device to electrical noise, in particular:
The present invention relates to an improved configuration of a new measurement system for the purpose of protecting the measurement device.
【０００２】[0002]
【従来の技術】電気的ノイズに対するデータ伝送装置の
耐性を測定する場合、そのデータ伝送装置に実際にデー
タ信号を伝播させる一方、意図的に発生した電気的ノイ
ズを装置に印加して、そのデータ伝送装置を経由して伝
播されたデータ信号の伝送品質を評価する方法がある。2. Description of the Related Art When measuring the resistance of a data transmission device to electrical noise, the data signal is actually propagated to the data transmission device while the electrical noise that is intentionally generated is applied to the device to obtain the data. There is a method of evaluating the transmission quality of a data signal propagated via a transmission device.
【０００３】図３は、上述のような方法を実施するため
の測定系の典型的な構成を示す図である。FIG. 3 is a diagram showing a typical configuration of a measurement system for carrying out the above method.
【０００４】同図に示すように、この測定系は、被測定
装置１と、被測定装置１に対して１対の信号伝送路３を
介して接続された測定装置２と、被測定装置１に対して
人工的な電気ノイズを印加することができるように配置
された電気的ノイズ印加装置４とから構成されている。
ここで、測定装置２は、信号発生器21と信号受信器22と
から構成されている。また、信号発生器21は信号伝送路
31を介して、信号受信器22は信号伝送路32を介して被測
定装置１に、各々接続されている。As shown in FIG. 1, this measurement system includes a device under test 1, a measuring device 2 connected to the device under test 1 via a pair of signal transmission paths 3, and a device under test 1. The electrical noise applying device 4 is arranged so as to be able to apply artificial electrical noise.
Here, the measuring device 2 is composed of a signal generator 21 and a signal receiver 22. In addition, the signal generator 21 is a signal transmission line.
The signal receiver 22 is connected to the device under test 1 via the signal transmission line 32 via 31.
【０００５】以上のように構成された測定系における測
定は以下のように行われる。即ち、電気的ノイズ発生装
置４により人工的なノイズを発生して被測定装置１に印
加する一方で、測定装置の信号発生器21から所定の試験
信号を発生して、信号伝送路31、被測定装置１および信
号伝送路32を経由して伝播した試験信号を信号受信器22
により受信する。この信号受信器22により受信された試
験信号と、信号発生器21により発生した信号とを比較す
ることにより、被測定装置１が電気的ノイズにより受け
る影響を測定することができる。The measurement in the measurement system configured as described above is performed as follows. That is, an artificial noise is generated by the electrical noise generator 4 and applied to the device under test 1, while a predetermined test signal is generated from the signal generator 21 of the measuring device to generate a predetermined test signal. The test signal propagated through the measuring device 1 and the signal transmission line 32 is used as the signal receiver 22.
To receive. By comparing the test signal received by the signal receiver 22 with the signal generated by the signal generator 21, it is possible to measure the effect of the electrical noise on the device under test 1.
【０００６】[0006]
【発明が解決しようとする課題】上述のような測定系
は、本来、被測定装置１において電気的ノイズが伝送信
号に与える影響を測定するためのものである。ところ
が、従来の測定系においては、信号伝送路３が同軸線等
の導電性の材料により形成されていたので、電気的ノイ
ズ印加装置４により被測定装置１に印加した電気的ノイ
ズが、信号伝送路３を経由して測定装置２にも印加され
てしまう場合がある。このような場合、被測定装置１に
対する正確な評価ができなくなることは言うまでもな
い。The measuring system as described above is originally for measuring the influence of electrical noise on the transmission signal in the device under test 1. However, in the conventional measurement system, since the signal transmission path 3 is formed of a conductive material such as a coaxial wire, the electrical noise applied to the device under test 1 by the electrical noise applying device 4 causes a signal transmission. It may also be applied to the measuring device 2 via the path 3. Needless to say, in such a case, accurate evaluation of the device under test 1 cannot be performed.
【０００７】また、特に、被測定装置１の静電気ノイズ
に対する耐性を評価する場合、被測定装置には極めて大
きな電圧のノイズが印加される。この種の直流ノイズが
測定装置２に印加されると測定装置２が破壊されてしま
う場合がある。このため、従来の測定系では静電気ノイ
ズに対する耐性の測定は実質的にできないと考えられて
いた。In particular, when evaluating the resistance of the device under test 1 to electrostatic noise, a very large voltage noise is applied to the device under test. When this kind of DC noise is applied to the measuring device 2, the measuring device 2 may be destroyed. Therefore, it has been considered that the conventional measurement system cannot substantially measure the resistance to electrostatic noise.
【０００８】そこで、本発明は、上記従来技術の問題点
を解決し、被測定装置と測定装置との間でノイズが直接
伝播することのない新規な測定系を提供することをその
目的としている。Therefore, an object of the present invention is to solve the above-mentioned problems of the prior art and to provide a new measuring system in which noise does not directly propagate between the device under test and the measuring device. ..
【０００９】[0009]
【課題を解決するための手段】本発明に従うと、被測定
装置に対して電気的ノイズを印加することができる電気
的ノイズ印加装置と、信号発生器により発生した試験信
号を被測定装置を経由して信号受信器に受け該被測定装
置に対する電気的ノイズの影響を測定することができる
測定装置とを含む測定系において、該測定装置と被測定
装置とを結合する信号伝送路の一部が非導電性の信号伝
送路により形成されていることを特徴とする電気的ノイ
ズに対する耐性の測定系が提供される。According to the present invention, an electrical noise applying device capable of applying electrical noise to a device under test and a test signal generated by a signal generator are passed through the device under test. In a measurement system including a measuring device capable of receiving the signal receiver and measuring the influence of electrical noise on the device under test, a part of the signal transmission line connecting the measuring device and the device under test is provided. Provided is a measurement system for resistance to electrical noise, which is characterized by being formed by a non-conductive signal transmission line.
【００１０】[0010]
【作用】本発明に係る測定系は、その信号伝送路の一部
が、非導電性の信号伝送路により構成されている点に特
徴がある。The measuring system according to the present invention is characterized in that a part of its signal transmission line is formed by a non-conductive signal transmission line.
【００１１】即ち、従来の測定系は、測定装置と被測定
装置とが導電性の信号伝送路により結合されていたの
で、被測定装置に印加した電気的ノイズが、信号伝送路
を介して測定装置に直接伝播してしまう場合があった。
このため、静電気ノイズに対する耐性等のように高電圧
のノイズを取り扱う場合は測定装置が破壊されてしまう
ので実質的に使用することができなかった。That is, in the conventional measuring system, since the measuring device and the device under test are coupled by the conductive signal transmission line, the electrical noise applied to the device under measurement is measured through the signal transmission line. In some cases, it was directly propagated to the device.
For this reason, when handling high-voltage noise such as resistance to electrostatic noise, the measuring device is destroyed and cannot be used practically.
【００１２】これに対して、本発明に係る測定系は、測
定装置と被測定装置との間の信号伝送路の一部を非導電
性の信号伝送路により接続しているので、非測定装置に
印加した電気的ノイズが測定装置に直接伝播されること
がない。従って、測定装置に対する電気的ノイズの影響
を考えることなく、非測定装置に任意の信号を印加して
耐性測定を行うことが可能になる。On the other hand, in the measuring system according to the present invention, a part of the signal transmission line between the measuring device and the device to be measured is connected by the non-conductive signal transmission line. The electrical noise applied to the sensor is not directly propagated to the measuring device. Therefore, it becomes possible to perform resistance measurement by applying an arbitrary signal to the non-measurement device without considering the influence of electrical noise on the measurement device.
【００１３】また、本発明の一態様に従うと、本発明に
係る測定系において使用される非導電性信号伝送路は、
光送信器、光伝送路および光受信器により構成された光
伝送路である。即ち、光伝送路では、測定装置と被測定
装置との間で伝播すべき信号を、一旦光信号に変換して
光伝送路を介して伝播する。光伝送路は、一般に、光フ
ァイバ等の非導電性の材料で形成されており、光伝送路
を介して電気的なノイズが直接伝播されることはない。According to an aspect of the present invention, the non-conductive signal transmission line used in the measurement system according to the present invention is
An optical transmission line composed of an optical transmitter, an optical transmission line, and an optical receiver. That is, in the optical transmission line, a signal to be propagated between the measuring device and the device under measurement is once converted into an optical signal and propagated through the optical transmission line. The optical transmission line is generally formed of a non-conductive material such as an optical fiber, and electrical noise does not propagate directly through the optical transmission line.
【００１４】更に、本発明の好ましい態様によれば、上
述のような光伝送路は、測定装置から被測定装置へ信号
を伝播するための伝送路と、被測定装置から測定装置へ
信号を戻すための信号伝送路との両方にそれぞれ挿入さ
れる。このような構成とすることにより、測定装置と被
測定装置とは電気的に完全に遮断され、被測定装置に印
加した電気的ノイズが測定装置側に伝播する恐れは全く
解消される。Further, according to a preferred aspect of the present invention, the optical transmission line as described above has a transmission line for propagating a signal from the measuring device to the device under test and a signal for returning the signal from the device under test to the measuring device. And a signal transmission path for the same. With such a configuration, the measuring device and the device to be measured are electrically completely cut off, and there is no fear of the electrical noise applied to the device to be measured being propagated to the measuring device side.
【００１５】以下、実施例を挙げて本発明をより具体的
に説明するが、以下の開示は本発明の一実施例に過ぎ
ず、本発明の技術的範囲を何ら限定するものではない。Hereinafter, the present invention will be described in more detail with reference to examples, but the following disclosure is merely an example of the present invention and does not limit the technical scope of the present invention.
【００１６】[0016]
【実施例】図１は、本発明に係る測定系の基本的な構成
を示す図である。尚、同図において、図３と共通の構成
要素には共通の参照番号を付している。DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a diagram showing the basic construction of a measuring system according to the present invention. Incidentally, in the figure, common reference numerals are given to constituent elements common to FIG.
【００１７】同図に示すように、この測定系は、被測定
装置１と測定装置２とを信号伝送路により結合して構成
されている。測定装置２の信号発生器21の出力31は、被
測定装置１の入力33に対して、光伝送路５を介して接続
されている。また、被測定装置１の出力34は、光伝送路
５を介して信号発生器22の入力32に接続されている。光
伝送路５は、それぞれ、光送信器51、56、光ファイバ5
2、55および光受信器53、54により構成されている。更
に、被測定装置１に対して電気的ノイズを印加すること
ができる電気的ノイズ印加装置４が配置されている。As shown in the figure, this measuring system is constructed by connecting the device under test 1 and the measuring device 2 by a signal transmission path. The output 31 of the signal generator 21 of the measuring device 2 is connected to the input 33 of the device under test 1 via the optical transmission line 5. The output 34 of the device under test 1 is connected to the input 32 of the signal generator 22 via the optical transmission line 5. The optical transmission line 5 includes optical transmitters 51 and 56 and an optical fiber 5 respectively.
2, 55 and optical receivers 53, 54. Further, an electrical noise applying device 4 capable of applying electrical noise to the device under test 1 is arranged.
【００１８】以上のように構成された測定系において、
測定装置２の信号発生器21が出力する試験信号は、光送
信器51において光信号に変換された後、光ファイバ52を
介して光受信器53に伝播される。光受信器53において、
受信された光信号は電気信号に変換され、かくして、被
測定装置１に試験信号が入力される。被測定装置１が出
力する試験信号は、光送信器56において光信号に変換さ
れた後、光ファイバ55を介して光受信器54に伝播され
る。光受信器54において、受信された光信号は電気信号
に変換され、従って、測定装置２の信号受信器22には、
被測定装置１を経由して伝播された試験信号が入力され
る。In the measurement system configured as above,
The test signal output from the signal generator 21 of the measuring apparatus 2 is converted into an optical signal by the optical transmitter 51 and then propagated to the optical receiver 53 via the optical fiber 52. In the optical receiver 53,
The received optical signal is converted into an electric signal, and thus the test signal is input to the device under test 1. The test signal output from the device under test 1 is converted into an optical signal by the optical transmitter 56 and then propagated to the optical receiver 54 via the optical fiber 55. In the optical receiver 54, the received optical signal is converted into an electrical signal, so that the signal receiver 22 of the measuring device 2 is
The test signal propagated via the device under test 1 is input.
【００１９】上述のような試験信号の伝達を行いつつ、
電気的ノイズ印加装置４により、被測定装置１に電気的
ノイズを印加することにより、電気的ノイズに対する被
測定装置１の特性を測定することができる。また、測定
装置２と被測定装置１とは、非導電性伝送路である１対
の光伝送路５を介して接続されているので、被測定装置
１に印加された電気的ノイズが伝送路を介して測定装置
２側に直接伝播されることはない。従って、静電気ノイ
ズに対する耐性の測定等のように高電圧を取り扱う測定
も可能になる。While transmitting the test signal as described above,
By applying the electrical noise to the device under test 1 by the electrical noise applying device 4, the characteristic of the device under test 1 with respect to the electrical noise can be measured. Further, since the measuring device 2 and the device to be measured 1 are connected via the pair of optical transmission lines 5 which are non-conductive transmission lines, the electrical noise applied to the device to be measured 1 is transmitted through the transmission line. It is not directly propagated to the measuring device 2 side via the. Therefore, it is possible to perform a measurement that handles a high voltage such as a measurement of resistance to electrostatic noise.
【００２０】図２は、本発明に係る測定系の具体的な構
成例を示す図である。尚、同図において、図１および図
３と共通の構成要素には共通の参照番号を付している。FIG. 2 is a diagram showing a concrete configuration example of the measurement system according to the present invention. In the figure, common reference numerals are given to constituent elements common to FIGS. 1 and 3.
【００２１】同図に示すように、この測定系は、図１に
示した測定系と同じ構成の測定装置２に対して、信号伝
送路31、光送信器51および光ファイバ52を介して測定装
置２に接続された光受信器53が被測定装置１となってい
る。光受信器53の出力は、光送信器56、光ファイバ55、
光受信器54および信号伝送路32を介して、測定装置２の
信号受信器22に接続されている。また、この測定系は、
光受信器53に対して静電気ノイズを印加することができ
る静電気ノイズ印加装置４ａを備えている。As shown in the figure, this measuring system measures the measuring device 2 having the same structure as the measuring system shown in FIG. 1 through a signal transmission path 31, an optical transmitter 51 and an optical fiber 52. The optical receiver 53 connected to the device 2 is the device under test 1. The output of the optical receiver 53 is the optical transmitter 56, the optical fiber 55,
It is connected to the signal receiver 22 of the measuring device 2 via the optical receiver 54 and the signal transmission path 32. Also, this measurement system
An electrostatic noise applying device 4a capable of applying electrostatic noise to the optical receiver 53 is provided.
【００２２】以上のように構成された測定系において、
被測定装置１である被受信器53は、試験信号の入力側に
ついても出力側についても、被ファイバ52、55により形
成された光伝送路を介して測定器２と接続されている。
従って、静電気ノイズ印加装置４ａにより如何なるノイ
ズを印加しても、これが測定装置２側に直接伝播するこ
とはない。In the measurement system configured as described above,
The receiver 53, which is the device to be measured 1, is connected to the measuring device 2 through the optical transmission path formed by the fibers 52 and 55 on both the input side and the output side of the test signal.
Therefore, no matter what noise is applied by the electrostatic noise applying device 4a, it is not directly propagated to the measuring device 2 side.
【００２３】[0023]
【発明の効果】以上説明したように、本発明に係る測定
系は、測定装置と被測定装置とを電気的に遮断している
ので、静電気ノイズに対する耐性の測定のように、被測
定装置に高電圧を印加するような測定も安全に行うこと
ができる。また、伝送路を介して被測定装置から測定装
置に電気的ノイズが直接伝播することがないので、被測
定装置に対する電気的ノイズの影響を精密に測定するこ
とが可能になる。As described above, since the measuring system according to the present invention electrically cuts off the measuring device and the device under test, it is possible to measure the device under test like the measurement of resistance to electrostatic noise. It is possible to safely perform a measurement in which a high voltage is applied. Further, since the electrical noise does not directly propagate from the device under test to the measuring device via the transmission path, it is possible to precisely measure the influence of the electrical noise on the device under measurement.
【００２４】従って、ＭＩＬ規格(Mil. Std. 883) やＩ
ＥＣ規格(IEC-Pub. 801-2)等に準拠したデータ伝送装置
の、電気的ノイズに対する耐性を有効に測定することが
可能になる。Therefore, the MIL standard (Mil. Std. 883) and I
It becomes possible to effectively measure the resistance to electrical noise of the data transmission device conforming to the EC standard (IEC-Pub. 801-2) and the like.
【図１】本発明に係る測定系の基本的な構成を示す図で
ある。FIG. 1 is a diagram showing a basic configuration of a measurement system according to the present invention.
【図２】本発明に係る測定系のより具体的な構成例を示
す図である。FIG. 2 is a diagram showing a more specific configuration example of the measurement system according to the present invention.
【図３】従来の測定系の典型的な構成を示す図である。FIG. 3 is a diagram showing a typical configuration of a conventional measurement system.
１・・・被測定装置、 ２・・・測定装置、３・
・・信号伝送路（導電性伝送路）、４・・・電気的ノイ
ズ印加装置、４ａ・・静電気ノイズ印加装置、５・・・
信号伝送路（光伝送路）、21・・・信号発生器、
22・・・信号受信器、31、32、33、34、35・・・導電
性信号伝送路、51、56・・・光送信器、 52、55・
・・光ファイバ、53、54・・・光受信器1 ... Device to be measured, 2 ... Measuring device, 3 ...
..Signal transmission lines (conductive transmission lines), 4 ... Electrical noise application device, 4a ... Electrostatic noise application device, 5 ...
Signal transmission line (optical transmission line), 21 ... Signal generator,
22 ... Signal receiver, 31, 32, 33, 34, 35 ... Conductive signal transmission path, 51, 56 ... Optical transmitter, 52, 55 ...
..Optical fiber, 53, 54 ... Optical receiver
Claims (3)
ることができる電気的ノイズ印加装置と、信号発生器に
より発生した試験信号を被測定装置を経由して信号受信
器に受け該被測定装置に対する電気的ノイズの影響を測
定することができる測定装置とを含む測定系において、
該測定装置と被測定装置とを結合する信号伝送路の一部
が非導電性の信号伝送路により形成されていることを特
徴とする電気的ノイズに対する耐性の測定系。1. An electrical noise applying device capable of applying electrical noise to a device under test, and a test signal generated by a signal generator which is received by a signal receiver via the device under test. In a measurement system including a measurement device capable of measuring the influence of electrical noise on the measurement device,
A measurement system for resistance to electrical noise, characterized in that a part of a signal transmission line connecting the measuring device and the device under test is formed by a non-conductive signal transmission line.
記非導電性の伝送路が、試験信号を光信号に変換して送
出する光送信器と、該光送信器の出力する光信号を伝播
する光ファイバ伝送路と、該光伝送路を伝播する光信号
を電気信号に変換する光受信器とを含む光伝送路である
ことを特徴とする測定系。2. The measurement system according to claim 1, wherein the non-conductive transmission line converts a test signal into an optical signal and outputs the optical signal, and an optical signal output from the optical transmitter. An optical transmission line that includes an optical fiber transmission line that propagates through the optical transmission line and an optical receiver that converts an optical signal that propagates through the optical transmission line into an electrical signal.
系において、前記電気的ノイズ印加装置が、静電気ノイ
ズ印加装置であることを特徴とする測定系。3. The measurement system according to claim 1 or 2, wherein the electrical noise applying device is an electrostatic noise applying device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11974792A JPH05288788A (en) | 1992-04-13 | 1992-04-13 | Measurement system resistance against electrical noise |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11974792A JPH05288788A (en) | 1992-04-13 | 1992-04-13 | Measurement system resistance against electrical noise |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05288788A true JPH05288788A (en) | 1993-11-02 |
Family
ID=14769151
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11974792A Withdrawn JPH05288788A (en) | 1992-04-13 | 1992-04-13 | Measurement system resistance against electrical noise |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05288788A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104635075A (en) * | 2013-11-08 | 2015-05-20 | 通用电气公司 | System and method for monitoring characteristics of an electrical device |
-
1992
- 1992-04-13 JP JP11974792A patent/JPH05288788A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104635075A (en) * | 2013-11-08 | 2015-05-20 | 通用电气公司 | System and method for monitoring characteristics of an electrical device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP3867067B2 (en) | Time domain reflectometer (TDR) and method for applying a time domain reflectometry test to a network cable | |
| MacAlpine et al. | Development of a fibre-optic sensor for partial discharges in oil-filled power transformers | |
| CN209327556U (en) | An integrated test system for frequency response characteristics of DC current transformers | |
| US7034546B2 (en) | Method and apparatus for measuring insertion loss of a conductor | |
| AU1405102A (en) | System for testing an electric high frequency signal and level measuring device provided with said system | |
| JPH05288788A (en) | Measurement system resistance against electrical noise | |
| US20040070406A1 (en) | Method for detection of a shielding fault in a multiwire cable | |
| US5936946A (en) | Measuring device for the interface of a transmission path with full-duplex transmission in the common carrier duplex process | |
| JP4819886B2 (en) | Module for testing the electromagnetic compatibility of high-speed Ethernet interfaces in an aircraft cabin | |
| US5055828A (en) | Parasitic-ground current indicator for electrical system | |
| JPH0545405A (en) | Cable partial discharge measurement method | |
| JP5047146B2 (en) | Electric field communication evaluation method and electric field communication evaluation apparatus | |
| JPH0572257A (en) | Measurement method of partial discharge for cable | |
| JPH08178997A (en) | Partial discharge measurement method for power cables | |
| RU2073252C1 (en) | Method and device for locating distance to open circuit in cable | |
| JPH0266476A (en) | Testing device for semiconductor circuit | |
| CN110324196B (en) | Cable operation monitoring system | |
| Chen et al. | Investigation of Partial Discharge Measuring Method via Coaxial Bonding Wire for Direct-buried Power Cable | |
| JPH0587862A (en) | Partial discharge measurement method | |
| JPH02165072A (en) | Detection of partial discharge at connection for of cable | |
| JP2739972B2 (en) | Ultrasonic flaw detector | |
| JPS6221072A (en) | Equilibrium point detection unit for low frequency Schulling bridge | |
| JPS6334363Y2 (en) | ||
| JPH06148261A (en) | Diagnosing method for insulation characteristic of equipment | |
| JPS62186625A (en) | Noise detector |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 19990706 |