JPS6154467A - Measuring method of shield effect - Google Patents
Measuring method of shield effectInfo
- Publication number
- JPS6154467A JPS6154467A JP17712584A JP17712584A JPS6154467A JP S6154467 A JPS6154467 A JP S6154467A JP 17712584 A JP17712584 A JP 17712584A JP 17712584 A JP17712584 A JP 17712584A JP S6154467 A JPS6154467 A JP S6154467A
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- Prior art keywords
- sample
- antenna
- transmitting
- container
- receiving
- Prior art date
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- Testing Electric Properties And Detecting Electric Faults (AREA)
Abstract
Description
【発明の詳細な説明】
〈産業上の利用分野〉
本発明は、シールド材の電磁界に対するシールド効果を
測定する方法に関する。DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a method for measuring the shielding effect of a shielding material against an electromagnetic field.
〈従来の技術〉
最近、外部からの不要放射電磁雑音による電子システム
の誤動作が頻発し、大きな問題となっている。その対策
として、電磁波に対するシールド効果の高いシールド材
により、雑音放射源を取り囲む必要が高ま）、そのよう
なシールド材の開発が急がれてｈる。<Prior Art> Recently, electronic systems have frequently malfunctioned due to unnecessary radiated electromagnetic noise from the outside, which has become a serious problem. As a countermeasure, there is an increasing need to surround the noise radiation source with a shielding material that has a high shielding effect against electromagnetic waves, and the development of such a shielding material is urgently needed.
シールド材の開発に当っては、材料のシールド効果を測
定しなければならない。従来、シールド効果の測定方法
としては、以下に述べるような方法が代表的な本のとし
て知られ°Ｃいる。When developing shielding materials, the shielding effectiveness of the material must be measured. Conventionally, the method described below is known as a typical method for measuring shielding effectiveness.
■第４図に示すよ５忙、両端が開放した方形の導体筒１
で送信アンテナ３と受信アンテナ４を囲み、両者の間に
方形の試料２を配置する。送信アンテナ３を送４１機５
に接続し、受信アンテナ４を受信機６に接続し、試料２
のある場合となり場合のそれぞれについて送、受信アン
テナ間結合量を測定し、その差をもって試料２のシール
ド効果を評価する。■As shown in Fig. 4, a square conductor tube 1 with open ends is open at both ends.
surround the transmitting antenna 3 and receiving antenna 4, and place the rectangular sample 2 between them. Send transmitting antenna 3 to 41 aircraft 5
Connect the receiving antenna 4 to the receiver 6, and connect the sample 2
The amount of coupling between the transmitting and receiving antennas is measured for each case, and the shielding effect of sample 2 is evaluated based on the difference.
■第５図に示すように、送信アンテナ１３と受信アンテ
ナ１４を対向させ、それらを方形の導体容器１１で周囲
を取シ囲む。送、受信アンテナ間に試料１２を挿入した
場合としない場合のそれぞれにつｂ′〔、送、受信アン
テナ間結合量を測定し、その差により試料１２のシール
ド効果を評価する。(2) As shown in FIG. 5, a transmitting antenna 13 and a receiving antenna 14 are placed opposite each other, and a rectangular conductive container 11 is used to surround them. The amount of coupling between the transmitting and receiving antennas is measured with and without inserting the sample 12 between the transmitting and receiving antennas, and the shielding effect of the sample 12 is evaluated based on the difference.
１５は送信アンテナ１３と接続される送信機、１６は受
信アンテナ１４と接続される受信機である。15 is a transmitter connected to the transmitting antenna 13, and 16 is a receiver connected to the receiving antenna 14.
■第６図に示すように、同軸ｇ２１の外部導体で試料２
２を囲み、中央導体２３を送、受信アンテナとして用い
、試料２２のある場合とない場合の送、受づｄアンテナ
叩結合量の差によ多試料のシールド効果を評価する。２
５は送信機、２６は受−Ｉｉ！機である。■As shown in Figure 6, sample 2 is connected to the outer conductor of coaxial g21.
Using the central conductor 23 as a transmitting and receiving antenna, the shielding effect of multiple samples is evaluated based on the difference in the amount of coupling between the transmitting and receiving antennas with and without the sample 22. 2
5 is a transmitter, 26 is a receiver-Ii! It is a machine.
〈発明が解決しようとする問題点〉
上記方法■は、送、受信アンテナ間に破線γで示すよう
な外部結合が生じる。°また、導体書簡１の内径が大き
い場合、導波管モードの発生によシ、送、受信アンテナ
３．４間に不要結合が発生する。<Problems to be Solved by the Invention> In the above method (2), external coupling as shown by the broken line γ occurs between the transmitting and receiving antennas. Further, when the inner diameter of the conductor plate 1 is large, unnecessary coupling occurs between the transmitting and receiving antennas 3 and 4 due to the generation of a waveguide mode.
このようなことから、試料固有のシールド効果を直接的
に正しく測定することは困難であり、測定値の補正が不
可欠である。For this reason, it is difficult to directly and correctly measure the shielding effect specific to the sample, and it is essential to correct the measured values.
上記方法■は、導体容器１１が大きい場合、共振モード
の発生によ）送、受信アンテナ１３．１４間に不要結合
が生じるため、上記１去■と同様の問題があるＣ、−！
た、送信アンテナ１３け固定となり、試料１２に照射す
る電磁波の波動インピーダンスを制御できないという問
題もある。Method (2) above has the same problem as (1) (3) above because when the conductor container 11 is large, unnecessary coupling occurs between the transmitting and receiving antennas 13 and 14 due to the generation of a resonance mode.C, -!
Another problem is that 13 transmitting antennas are fixed, and the wave impedance of the electromagnetic waves irradiated onto the sample 12 cannot be controlled.
上記方法■は、ＴＥＭモードに〉ける測定であるので、
平面電磁波に対する測定しかできず、近接領域での測定
は不可能である。The above method ■ is a measurement in TEM mode, so
It can only measure plane electromagnetic waves and cannot measure in close range.
本発明は、以上に述べ九従来方法の諸問題を解決したシ
ールド効果測定方法を提供しようとするものである。The present invention aims to provide a shielding effect measuring method that solves the problems of the nine conventional methods described above.
〈問題点を解決するための手段〉
本発明は、上記問題点を解決するために、送信アンテナ
と受信アンテナとの間に試料を介在させた場合と介在さ
せない場合との該送、受信アンテナ間結合景の差をもっ
て該試料のシールド効果を評価するシールド効果測定方
法において、測定周波数よりカットオフ周波数が十分高
い、一面のみ開放した導体容器内に該受（Ｃアンテナを
収容し、該試料を該導体容器の開放面に配置し、該送づ
Ｃアンテナを該試料の前方の外部空間に配置する。<Means for Solving the Problems> In order to solve the above-mentioned problems, the present invention provides a method for solving the problems between the transmitting antenna and the receiving antenna, with and without a sample interposed between the transmitting antenna and the receiving antenna. In a shielding effect measurement method that evaluates the shielding effect of the sample based on the difference in the coupled view, the receiver (C antenna is housed in a conductor container with only one side open, and the cutoff frequency is sufficiently higher than the measurement frequency, and the sample is It is placed on the open surface of the conductor container, and the sending C antenna is placed in the external space in front of the sample.
〈作用〉
試料配置回以外では受１Ｃアンテナは導体で囲１れるた
め、送、受信アンテナ間に不要な外部結合が生じなくな
る。導体容器のカットオフ周波数は測定周波数より十分
高ぐ選ばれているため、共振の影響を受けない。送信ア
ンテナは外部空間に配置されるから、送１ｄアンテナを
自由に移動させることだより、試料面上の波動インピー
ダンスを容易に変更できる。<Function> Since the receiving 1C antenna is surrounded by a conductor except during sample placement, unnecessary external coupling between the transmitting and receiving antennas is prevented. The cutoff frequency of the conductor container is chosen to be sufficiently higher than the measurement frequency, so it is not affected by resonance. Since the transmitting antenna is placed in the external space, the wave impedance on the sample surface can be easily changed by freely moving the transmitting antenna.
〈実施例〉 以下、本発明の一実施例について詳細に説明する。<Example> Hereinafter, one embodiment of the present invention will be described in detail.
第１図に、シールド効果測定のための装置構成を示す。FIG. 1 shows the configuration of an apparatus for measuring the shielding effect.
この図において、３１は金属導体で作られた容器であり
、その一面（図中左面）だけが開放されている。この容
器３１の内面寸法は、測定波長より十分小さく選ばれて
いる。測定周波数の上限がＩＧＨ２の場合、容器３１と
して、例えば１００關Ｘ１００ＢＸ１００羽の内面寸法
を有する方形筒体が用いられる。また容器３１には、そ
の開放面と同一面に、金属プレート３２が延設されてい
る。In this figure, 31 is a container made of a metal conductor, and only one side (the left side in the figure) is open. The inner dimensions of this container 31 are selected to be sufficiently smaller than the measurement wavelength. When the upper limit of the measurement frequency is IGH2, the container 31 is a rectangular cylinder having inner dimensions of, for example, 100 mm x 100 B x 100 wings. Further, a metal plate 32 is extended on the same surface as the open surface of the container 31.
容器３１の内部に受信アンテナ３３か配置されている。A receiving antenna 33 is arranged inside the container 31.
この受信アンテナ３３の引き出し線は、微小な孔３５を
通して容器３１から外部へ引き出され、受信機３６に接
続されている。The lead wire of this receiving antenna 33 is led out from the container 31 through a minute hole 35 and connected to a receiver 36 .
３Ｔは測定すべき試料であり、容器３１の開放面をふさ
ぐよ５Ｋ、取付はネジ３８により金属プレート３２に取
抄付けられる。3T is a sample to be measured, which is attached to a metal plate 32 with screws 38, and is attached to a metal plate 32 with a screw 38 so as to close the open surface of the container 31.
３９は送信アンテナであり、支持体４０の上端部に叉持
されてｂる。この支持体４０の下端部はネジが切られた
送〕軸４１Ｖｃ螺合しており、送り軸４１を回転させる
ことにより支持体４０を送づ６アンテナ３９と一諸に矢
印４２の方向に進退させ得るように成っている。すなわ
ち、送松軸４１を回転させることにより、送信アンテナ
３９と試料３Ｔの距離を変化させ得る。送信アンテナ３
９の引き出し線は送信機４４と接続される。A transmitting antenna 39 is held at the upper end of the support 40. The lower end of this support 40 is screwed into a threaded feed shaft 41Vc, and by rotating the feed shaft 41, the support 40 is sent and moved forward and backward together with the six antennas 39 in the direction of the arrow 42. It is designed so that it can be used. That is, by rotating the sending shaft 41, the distance between the transmitting antenna 39 and the sample 3T can be changed. Transmission antenna 3
The lead line 9 is connected to the transmitter 44 .
なお、受４Ｓアンテナ３３シよび送信アンテナ３９とし
ては、電界シールド効果測定用には微小ダイポールアン
テナ、磁界シールド効果測定用には微小ループアンテナ
が一般に用いられる。しかし、指向性やゲインの点で問
題があればモノボールアンテナや多重ループアンテナ等
を使用し°Ｃもよい。As the receiving 4S antenna 33 and the transmitting antenna 39, a micro dipole antenna is generally used for measuring the electric field shielding effect, and a micro loop antenna is generally used for measuring the magnetic field shielding effect. However, if there is a problem with directivity or gain, a monoball antenna, multiple loop antenna, etc. may be used in °C.
測定の手順は次の通りである。送信アンテナ３９の位置
、送信機４４の出力レベルと送信周波数、受信機３６の
受づｍ周波数等を設定する。そして、試料３７を取り付
けた場合と取り付けない場合のそれぞれについて、受’
＋６アンテナ３３の誘起電力を受信機３６で検出し、試
料３γの有無による送、受信アンテナ３９．３３間結合
量の差を測定する。The measurement procedure is as follows. The position of the transmitting antenna 39, the output level and transmission frequency of the transmitter 44, the receiving frequency of the receiver 36, etc. are set. Then, for each case with and without sample 37 attached,
The induced power of the +6 antenna 33 is detected by the receiver 36, and the difference in the amount of coupling between the transmitting and receiving antennas 39 and 33 depending on the presence or absence of the sample 3γ is measured.
本実施例の場合、受信アンテナ３３は、試料取付は面取
外は金属導体容器３１により包囲されるため、送、受信
アンテナ３３．３９間の外部結合は生じない。筐た、容
器３１の内面寸法は測定波長より十分小ｉく、容器３１
のカットオフ周波数は測定周波数よし十分高いため、容
器３１の共振問題は起こらない。上述した寸法の場合、
最低次共振モードのＴＥｌｏｌに対する共振周波数は２
．１ＧＨ２となＩＩ）、ＩＧＨ２までの測定周波数につ
いて容々）滲３１の共振の影響は無視し得る。かくして
、従来のような外部結合や共振の影響を受けることなく
、シールド効果を直接的に正確に測定できる。In the case of this embodiment, since the receiving antenna 33 is surrounded by the metal conductor container 31 except for mounting the sample and removing the chamfer, no external coupling occurs between the transmitting and receiving antennas 33 and 39. The inner dimensions of the casing and the container 31 are sufficiently smaller than the measurement wavelength, and the container 31
Since the cutoff frequency of is sufficiently higher than the measurement frequency, the resonance problem of the container 31 does not occur. For the dimensions mentioned above,
The resonant frequency for TElol of the lowest order resonant mode is 2
．． For measurement frequencies up to 1GH2 and IGH2), the influence of the resonance of the leak 31 can be ignored. In this way, the shielding effect can be directly and accurately measured without being affected by external coupling or resonance as in conventional methods.
また、送信アンテナ３９を移動させることにより、波動
インピーダンスｔ一種々変更しなからｉｔ＋＋定を行う
ことができ、試料３７のシールド効果を広範囲に亘って
測定できる。なお、送信アンテナ３９の近接領域（Ｎｅ
ａｒ Ｆｉｅｌｄ）における波動インピーダンスは、
下式のように表され、周波数と距離の関数であり、測定
周波数が一定ならば距離だけの関数になる。Further, by moving the transmitting antenna 39, it is possible to perform the it++ constant without changing the wave impedance t one by one, and the shielding effect of the sample 37 can be measured over a wide range. Note that the area near the transmitting antenna 39 (Ne
The wave impedance in ar Field) is
It is expressed as the following formula and is a function of frequency and distance, and if the measurement frequency is constant, it is a function of only distance.
微小ループアンテナの場合−
（ただし、Ｚｗ□磁界に対する波動インピーダンス）
微小ダイポールアンテナの場合：
（ただし、Ｚｗｅ は電界に対する波動インピーダンス
）
ことで
Ｚ、）＝１２０π〔Ω〕
β＝２πｆ□／ＣＯ（ｆｏは周波数）
Ｃ□ ＝＝３Ｘ １０８［）ｎ ］
ｒ＝アンテナからの距離〔迫〕
（’ＦＭａｍシールドのｔｉ４Ｍ ： ７−ニムシー発
行、Ｐ２６．２７参照）
さらに１試料３Ｔは容器３１の開放面に配置するから、
試料３γの取付け、取外しは極め“〔容易である。In the case of a small loop antenna - (however, Zw□ wave impedance to the magnetic field) In the case of a small dipole antenna: (however, Zwe is the wave impedance to the electric field) Therefore, Z, ) = 120π [Ω] β = 2πf / CO (fo is the frequency) C□ ==3 Because we will place
Mounting and removing sample 3γ is extremely easy.
第２図に、本実施例の方法による磁界７−ルド効果の測
定結果を例示する。この時の試料は固有抵抗２．８２８
Ｘ １０−’ （（Ｌ、 ａｎ ） 、厚さ１７β司
のアルはニウム箔、送１δアンテナと試料の距＾ｆｆｉ
”１．５ ｍｍである。このグラフのカーブは計算値で
あり、黒点が測定値である。なお、計算は、前記のＺｗ
ｈあるいは２ｗ８ と試料の固有インピーダンスとのＦ
７：続接続に対して伝送回路論的に行なったーアンテナ
は、２回巻ループアンテナを使用し、ループ面は試料と
平行に配置した。この例から、本実施例によれば、シー
ルド効果を直接的忙極めて正確に測定できることが分か
る。FIG. 2 illustrates the results of measuring the magnetic field effect using the method of this example. The sample at this time had a specific resistance of 2.828
X 10-' ((L, an), aluminum foil with thickness 17β, distance between 1δ antenna and sample ^ffi
"1.5 mm. The curve in this graph is a calculated value, and the black dot is a measured value. The calculation is based on the above Zw
F between h or 2w8 and the specific impedance of the sample
7: Continuation connection was performed based on transmission circuit theory - A two-turn loop antenna was used as the antenna, and the loop surface was placed parallel to the sample. From this example, it can be seen that according to this example, the shielding effect can be measured directly and accurately.
別の試料を用い、本実施例の方法により測定し九電界お
よび磁界に対するシールド効果を第３ｒ♂に示す。試料
は厚さ１間のカーボン入りプラスチックであり、送信ア
ンテナと試料の距ｒｆＮは５πｍである。なお、とのグ
ラフからも分かるように、近接領域におい゛〔は、（１
）磁界シールド効果は周波数が上昇するに従い単ｖ４に
悪化し、（２）電界シールド効果は周波数が上昇するｒ
ｃつれ単調に向上する、という一般的傾向がある。Using another sample, the shielding effect against the electric field and magnetic field was measured by the method of this example, and the shielding effect against the electric field and magnetic field is shown in 3rd r♂. The sample is made of carbon-containing plastic with a thickness of 1 mm, and the distance rfN between the transmitting antenna and the sample is 5πm. Furthermore, as can be seen from the graph, in the adjacent region ゛[ is (1
) The magnetic field shielding effect deteriorates to single v4 as the frequency increases, and (2) the electric field shielding effect deteriorates as the frequency increases.
There is a general tendency to increase monotonically with c.
以上、一実施例について説明したが、本発明はそれだけ
に限定されるものではなく、種々変形して実施し得るも
のである。Although one embodiment has been described above, the present invention is not limited thereto, and can be implemented with various modifications.
〈発明の効果〉
以上の説明から明らかなように、本発明によｔしば、以
下のような効果を得られる。<Effects of the Invention> As is clear from the above description, the following effects can be obtained by the present invention.
（Ｉ）送、受信アンテナ間の外部結合を防止できる。(I) External coupling between transmitting and receiving antennas can be prevented.
（Ｉ［）導体容器の共振による送、受信アンテナ間の不
要結合を防止できる。(I[) Unnecessary coupling between the transmitting and receiving antennas due to resonance of the conductor container can be prevented.
（ｌＩ［）上記（Ｉ）＆（ＩＩ）の結果、シールド効果
を正確に直接的に測定できる。(lI[) As a result of (I) & (II) above, the shielding effect can be accurately and directly measured.
（ＩＶ）送信アンテナは外部空間に配置括れるので、そ
の試料からの距離を自由に変えることができる。(IV) Since the transmitting antenna can be placed in an external space, its distance from the sample can be changed freely.
従つ゛〔、試料表面の波動インピーダンスを種々変化さ
せて、試料のシールド効果を測定でさるっ（Ｖ）試料は
導体容器の開放面に配置するから、その取・付け、取外
しが容易であり、測定を能率的に行うことができる。Therefore, the shielding effect of the sample can be measured by varying the wave impedance of the sample surface. (V) Since the sample is placed on the open surface of the conductor container, it is easy to attach, attach, and remove it. Measurements can be performed efficiently.
第１図は本発明の一実施例における測定装置構成を示す
概略断面図、第２図は同実施例の方法によるアルミニウ
ム箔の磁界シールド効果の測定値とその計算値を示すグ
ラフ、第３図は同実施例の方法によるカーボン入９プラ
スチックの電界および磁界に対するシールド効果の測定
値を示すグラフ、第４図ないし第６１２はそれぞれ従来
のシールド効果測定方法を説明するための概略断面図で
あ３１・・・金属導体の容器、 ３２・・・金属プＶ−
）、 ３３・・・受信アンテナ、 ３６・・・受
・１６機、 ３７・噂・試料、 ３９・・・送信ア
ンテナ、 ４４−・・送信機。
第１図
第２図
第３図
闇濃較〔Ｇｌｂ）FIG. 1 is a schematic sectional view showing the configuration of a measuring device in an embodiment of the present invention, FIG. 2 is a graph showing measured values and calculated values of the magnetic field shielding effect of aluminum foil by the method of the same embodiment, and FIG. 3 31 is a graph showing the measured values of the shielding effect of carbon-containing plastic 9 against electric and magnetic fields by the method of the same example, and FIGS. ... Metal conductor container, 32 ... Metal conductor V-
), 33... Receiving antenna, 36... Receiving 16 units, 37 Rumor/Sample, 39... Transmitting antenna, 44-... Transmitter. Figure 1 Figure 2 Figure 3 Dark comparison [Glb]
Claims (1)
場合と介在させない場合との該送、受信アンテナ間結合
量の差をもつて該試料のシールド効果を評価するシール
ド効果測定方法において、測定周波数よりカットオフ周
波数が十分高い、一面のみ開放した導体容器内に該受信
アンテナを収容し、該試料を該導体容器の開放面に配置
し、該送信アンテナを該試料の前方の外部空間に配置す
ることを特徴とするシールド効果測定方法。In a shielding effect measurement method that evaluates the shielding effect of a sample based on the difference in the amount of coupling between the transmitting and receiving antennas when a sample is interposed between the transmitting antenna and the receiving antenna and when the sample is not interposed between the transmitting antenna and the receiving antenna, the measurement frequency is The receiving antenna is housed in a conductive container with only one side open, which has a sufficiently high cutoff frequency, the sample is placed on the open surface of the conductive container, and the transmitting antenna is placed in an external space in front of the sample. A shielding effect measuring method characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17712584A JPS6154467A (en) | 1984-08-25 | 1984-08-25 | Measuring method of shield effect |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17712584A JPS6154467A (en) | 1984-08-25 | 1984-08-25 | Measuring method of shield effect |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6154467A true JPS6154467A (en) | 1986-03-18 |
| JPH0418790B2 JPH0418790B2 (en) | 1992-03-27 |
Family
ID=16025603
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17712584A Granted JPS6154467A (en) | 1984-08-25 | 1984-08-25 | Measuring method of shield effect |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6154467A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62211400A (en) * | 1986-03-12 | 1987-09-17 | Kansai Paint Co Ltd | Method for preventing foaming in washing stage after coating by electrodeposition |
| JPS62167288U (en) * | 1986-04-11 | 1987-10-23 | ||
| CN1298915C (en) * | 2002-03-05 | 2007-02-07 | 乐金电子(天津)电器有限公司 | Assembling structure of washing machine display part |
| CN1324188C (en) * | 2002-07-05 | 2007-07-04 | 乐金电子(天津)电器有限公司 | Control panel assembly for washing machine |
| JP2014020981A (en) * | 2012-07-20 | 2014-02-03 | Seiwa Electric Mfg Co Ltd | Electromagnetic wave shield performance evaluation tool, and electromagnetic wave shield performance evaluation method using the same |
| CN103630777A (en) * | 2013-11-19 | 2014-03-12 | 陕西海泰电子有限责任公司 | Electric equipment shielding effectiveness test system and method |
-
1984
- 1984-08-25 JP JP17712584A patent/JPS6154467A/en active Granted
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62211400A (en) * | 1986-03-12 | 1987-09-17 | Kansai Paint Co Ltd | Method for preventing foaming in washing stage after coating by electrodeposition |
| JPS62167288U (en) * | 1986-04-11 | 1987-10-23 | ||
| JPH0410628Y2 (en) * | 1986-04-11 | 1992-03-16 | ||
| CN1298915C (en) * | 2002-03-05 | 2007-02-07 | 乐金电子(天津)电器有限公司 | Assembling structure of washing machine display part |
| CN1324188C (en) * | 2002-07-05 | 2007-07-04 | 乐金电子(天津)电器有限公司 | Control panel assembly for washing machine |
| JP2014020981A (en) * | 2012-07-20 | 2014-02-03 | Seiwa Electric Mfg Co Ltd | Electromagnetic wave shield performance evaluation tool, and electromagnetic wave shield performance evaluation method using the same |
| CN103630777A (en) * | 2013-11-19 | 2014-03-12 | 陕西海泰电子有限责任公司 | Electric equipment shielding effectiveness test system and method |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0418790B2 (en) | 1992-03-27 |
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