JP2012127684A - Noise distribution measuring apparatus - Google Patents

Noise distribution measuring apparatus Download PDF

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JP2012127684A
JP2012127684A JP2010276957A JP2010276957A JP2012127684A JP 2012127684 A JP2012127684 A JP 2012127684A JP 2010276957 A JP2010276957 A JP 2010276957A JP 2010276957 A JP2010276957 A JP 2010276957A JP 2012127684 A JP2012127684 A JP 2012127684A
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noise
test object
detection
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distribution measuring
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JP5677066B2 (en
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Fujiyuki Nakamoto
藤之 中本
Takeshi Uchida
雄 内田
Chiharu Miyazaki
千春 宮崎
Naoto Oka
尚人 岡
Koichiro Misu
幸一郎 三須
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Mitsubishi Electric Corp
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Abstract

PROBLEM TO BE SOLVED: To provide a noise distribution measuring apparatus that can separate noise emitted by a test object from noise externally applied, and easily specify a position to be treated with respect to the noise externally intruded.SOLUTION: A control part 5 controls a signal generator 4 such that a noise application level with respect to a test object 1 changes in a step manner. The noise generated by the test object 1 is detected by a noise detection probe 10 and received by a receiver 8. When a level change of the detected noise signal received by the receiver 8 is according to a level change of the noise applied to the test object 1, a discriminator 7 determines that the noise applied to a detection position propagates.

Description

この発明は、試験対象物の外部からノイズを印加し、試験対象物上に侵入したノイズの分布を測定するノイズ分布測定装置に関するものである。   The present invention relates to a noise distribution measuring apparatus that applies noise from the outside of a test object and measures the distribution of noise that has entered the test object.

従来より、プリント基板等において、外部からの妨害によって誤動作が発生するかを確認するため、プリント基板等にノイズを印加し、そのノイズ分布を測定するようにしたノイズの可視化システムがある。
例えば、特許文献１に記載された可視化システムでは、プリント基板等の試験対象物に対して、インタフェース等を介して高周波ノイズを注入し、注入されたノイズが試験対象物のどの部分から多く発生しているかを検出して可視化している。 2. Description of the Related Art Conventionally, there is a noise visualization system in which noise is applied to a printed circuit board or the like and its noise distribution is measured in order to confirm whether or not a malfunction occurs due to external interference in the printed circuit board or the like.
For example, in the visualization system described in Patent Document 1, high-frequency noise is injected into a test object such as a printed circuit board via an interface or the like, and the injected noise is generated from any part of the test object. Is detected and visualized.

特開２００２−３１８２５２号公報JP 2002-318252 A

しかしながら、上記従来の構成では、試験対象物が出すノイズと外部から印加したノイズの両方のノイズを可視化用アンテナで検出している。従って、試験対象物が出すノイズと外部から印加したノイズを分離できず、外部から侵入したノイズに対する対策箇所の特定が困難であるという問題があった。   However, in the conventional configuration described above, both the noise generated by the test object and the noise applied from the outside are detected by the visualization antenna. Therefore, there is a problem in that it is difficult to separate the noise generated by the test object from the noise applied from the outside, and it is difficult to specify the countermeasure location for the noise entering from the outside.

この発明は上記のような課題を解決するためになされたもので、試験対象物が出すノイズと外部から印加したノイズを分離でき、外部から侵入したノイズに対する対策箇所の特定を容易に行うことのできるノイズ分布測定装置を得ることを目的とする。   The present invention has been made to solve the above-described problems, and can separate the noise generated by the test object from the noise applied from the outside, and easily identify the countermeasures against the noise that has entered from the outside. An object of the present invention is to obtain a noise distribution measuring apparatus capable of performing the above.

この発明に係るノイズ分布測定装置は、試験対象物に対してノイズを印加するノイズ印加手段と、試験対象物から発生するノイズを検出するためのノイズ検出手段と、試験対象物上の任意の検出位置で、ノイズ印加手段の印加レベルを予め決められた波形となるよう変化させ、ノイズ検出手段の検出レベルが予め決められた波形に追従した変化となる場合、検出位置に印加したノイズが伝搬したと判定する判別手段とを備えたものである。   A noise distribution measuring apparatus according to the present invention includes a noise applying means for applying noise to a test object, a noise detecting means for detecting noise generated from the test object, and any detection on the test object. When the application level of the noise application means is changed to a predetermined waveform at the position, and the detection level of the noise detection means changes following the predetermined waveform, the noise applied to the detection position propagates And discriminating means for judging that.

この発明のノイズ分布測定装置は、ノイズ印加手段の印加レベルを予め決められた波形となるよう変化させ、ノイズ検出手段の検出レベルが予め決められた波形に追従した変化となる場合、検出位置に印加したノイズが伝搬したと判定するようにしたので、試験対象物が出すノイズと外部から印加したノイズを分離することができ、外部から侵入したノイズに対する対策箇所の特定を容易に行うことができる。   The noise distribution measuring apparatus according to the present invention changes the application level of the noise application unit to a predetermined waveform, and when the detection level of the noise detection unit changes following the predetermined waveform, the detection position is set. Since it is determined that the applied noise has propagated, the noise generated by the test object and the noise applied from the outside can be separated, and the countermeasure location for the noise entering from the outside can be easily identified. .

この発明の実施の形態１によるノイズ分布測定装置を示す構成図である。It is a block diagram which shows the noise distribution measuring apparatus by Embodiment 1 of this invention. この発明の実施の形態１によるノイズ分布測定装置におけるノイズ判別処理を示すフローチャートである。It is a flowchart which shows the noise discrimination | determination process in the noise distribution measuring apparatus by Embodiment 1 of this invention.

実施の形態１．
図１は、この発明の実施の形態１によるノイズ分布測定装置を示す構成図である。
図示のノイズ分布測定装置は、試験対象物１のノイズ分布を測定する装置であり、ケーブル２、ノイズ印加用プローブ３、信号発生器４、制御部５、表示部６、判別器７、受信機８、可動部９、ノイズ検出用プローブ１０を備えている。 Embodiment 1 FIG.
1 is a block diagram showing a noise distribution measuring apparatus according to Embodiment 1 of the present invention.
The illustrated noise distribution measuring device is a device for measuring the noise distribution of the test object 1, and includes a cable 2, a noise applying probe 3, a signal generator 4, a control unit 5, a display unit 6, a discriminator 7, and a receiver. 8, a movable part 9 and a noise detection probe 10 are provided.

試験対象物１は、例えばプリント基板であり、ケーブル２はプリント基板の内部回路に電気的に接続されるケーブルである。ノイズ印加用プローブ３は、ケーブル２に対してノイズを印加するためのプローブであり、信号発生器４とケーブルで接続されている。信号発生器４は、制御部５によって制御される信号波形となるようノイズ信号を発生し、ノイズ印加用プローブ３に供給するための信号発生器であり、制御部５とケーブルで接続されている。なお、ノイズ印加用プローブ３と信号発生器４との間に増幅器を追加し、印加するノイズのレベルを増幅しても良い。制御部５は、ノイズ分布測定装置としての各部の制御を司るものであり、信号発生器４が発生するノイズ信号の制御を行うと共に、ノイズ検出用プローブ１０を移動させる可動部９の位置制御や、判別器７の判別処理の制御、および、表示部６への各種情報の表示制御を行う。表示部６は、ノイズ分布の測定結果を表示するためのディスプレイである。   The test object 1 is, for example, a printed board, and the cable 2 is a cable that is electrically connected to an internal circuit of the printed board. The noise application probe 3 is a probe for applying noise to the cable 2 and is connected to the signal generator 4 by a cable. The signal generator 4 is a signal generator for generating a noise signal so as to have a signal waveform controlled by the control unit 5 and supplying the noise signal to the noise application probe 3, and is connected to the control unit 5 by a cable. . An amplifier may be added between the noise application probe 3 and the signal generator 4 to amplify the level of noise to be applied. The control unit 5 controls each unit as a noise distribution measuring device, controls the noise signal generated by the signal generator 4, and controls the position of the movable unit 9 that moves the noise detection probe 10. Control of the discrimination process of the discriminator 7 and display control of various information on the display unit 6 are performed. The display unit 6 is a display for displaying the measurement result of the noise distribution.

判別器７は、試験対象物１に対して印加したノイズの印加レベルの変化とノイズ検出レベルの変化とに基づいて外部からのノイズが伝搬するかを判別するものである。受信機８は、ノイズ検出用プローブ１０とケーブルを介して接続され、ノイズ検出用プローブ１０で検出されたノイズ信号を受信するものである。なお、受信機８とノイズ検出用プローブ１０との間に増幅器を追加し、受信するノイズのレベルを増幅しても良い。可動部９は制御部５からの指示に基づいてノイズ検出用プローブ１０をｘ（横）、ｙ（縦）、ｚ（高さ）、θ（回転）方向に移動させるための可動手段であり、ノイズ検出用プローブ１０は、試験対象物１上を所定の間隔をもって設置されたプローブである。ノイズ検出用プローブが移動する座標系は直交座標系だけではなく、極座標系，円筒座標系，球座標系など問わない。   The discriminator 7 discriminates whether or not external noise propagates based on the change in the applied level of noise applied to the test object 1 and the change in the noise detection level. The receiver 8 is connected to the noise detection probe 10 via a cable and receives a noise signal detected by the noise detection probe 10. Note that an amplifier may be added between the receiver 8 and the noise detection probe 10 to amplify the level of received noise. The movable unit 9 is a movable unit for moving the noise detection probe 10 in the x (horizontal), y (vertical), z (height), and θ (rotation) directions based on an instruction from the control unit 5. The noise detection probe 10 is a probe installed on the test object 1 with a predetermined interval. The coordinate system in which the noise detection probe moves is not limited to an orthogonal coordinate system, but may be a polar coordinate system, a cylindrical coordinate system, or a spherical coordinate system.

また、ケーブル２、ノイズ印加用プローブ３、信号発生器４および制御部５によって、試験対象物１に対してノイズを印加するためのノイズ印加手段が構成されている。さらに、受信機８、可動部９、ノイズ検出用プローブ１０によって、試験対象物１から発生するノイズを検出するためのノイズ検出手段が構成されている。また、可動部９及びノイズ検出用プローブ１０によって、ノイズ検出手段の検出位置を試験対象物１上で移動させる可動手段が構成されている。また、制御部５および判別器７によって、可動手段によって試験対象物１上を移動させる際に、任意の検出位置で、ノイズ印加手段の印加レベルを予め決められた波形となるよう変化させ、ノイズ検出手段の検出レベルが予め決められた波形に追従した変化となる場合、この検出位置に印加したノイズが伝搬したと判定する判別手段が構成されている。なお、制御部５と判別器７からなる判別手段はコンピュータによって実現され、それぞれの機能に対応したソフトウェアと、ソフトウェアを実行するためのＣＰＵやメモリといったハードウェアから構成されている。あるいは、一部または全てを専用のハードウェアで構成してもよい。   The cable 2, the noise application probe 3, the signal generator 4, and the control unit 5 constitute noise application means for applying noise to the test object 1. Further, the receiver 8, the movable portion 9, and the noise detection probe 10 constitute noise detection means for detecting noise generated from the test object 1. The movable unit 9 and the noise detection probe 10 constitute a movable unit that moves the detection position of the noise detection unit on the test object 1. Further, when the control unit 5 and the discriminator 7 move the test object 1 by the movable means, the application level of the noise applying means is changed to a predetermined waveform at an arbitrary detection position, and the noise is reduced. When the detection level of the detection unit changes following a predetermined waveform, a determination unit is configured to determine that the noise applied to the detection position has propagated. The discriminating means including the control unit 5 and the discriminator 7 is realized by a computer, and includes software corresponding to each function and hardware such as a CPU and a memory for executing the software. Or you may comprise a part or all by the hardware for exclusive use.

次に、実施の形態１におけるノイズ分布測定装置の動作について説明する。
試験対象物１に接続されているケーブル２からノイズを印加する場合、制御部５からの指示に基づき信号発生器４でノイズ信号を発生させる。このノイズ信号はノイズ印加用プローブ３と信号発生器４の間のケーブル内を伝搬し、ノイズ印加用プローブ３に入力される。さらに、ノイズ印加用プローブ３に入力されたノイズがケーブル２を介して試験対象物１に入力され、試験対象物１の内部を伝搬する。その時、可動部９は、制御部５に入力されたｘｙｚθ等の座標情報を元に、ノイズ検出用プローブ１０を試験対象物１上で移動させ、また、制御部５は表示部６にその座標情報を表示させる。同時に、ノイズ検出用プローブ１０は各可動位置でのノイズを検出し、ノイズ検出用プローブ１０が検出したノイズ信号が、ノイズ検出用プローブ１０と受信機８の間のケーブル内を伝搬し、受信機８に入力される。受信機８に入力されたノイズ信号は制御部５に取り込まれて保持される。判別器７では、制御部５が信号発生器４に指示したノイズ印加レベルと受信機８からのノイズ検出レベルを比較することでノイズ判別処理を行い、制御部５は、その判別結果を表示部６に表示させる。 Next, the operation of the noise distribution measuring apparatus in the first embodiment will be described.
When applying noise from the cable 2 connected to the test object 1, a noise signal is generated by the signal generator 4 based on an instruction from the control unit 5. This noise signal propagates in the cable between the noise application probe 3 and the signal generator 4 and is input to the noise application probe 3. Further, noise input to the noise application probe 3 is input to the test object 1 via the cable 2 and propagates inside the test object 1. At that time, the movable unit 9 moves the noise detection probe 10 on the test object 1 based on the coordinate information such as xyzθ input to the control unit 5, and the control unit 5 displays the coordinates on the display unit 6. Display information. At the same time, the noise detection probe 10 detects noise at each movable position, and the noise signal detected by the noise detection probe 10 propagates in the cable between the noise detection probe 10 and the receiver 8, and the receiver 8 is input. The noise signal input to the receiver 8 is captured and held by the control unit 5. The discriminator 7 performs noise discrimination processing by comparing the noise application level instructed by the control unit 5 to the signal generator 4 and the noise detection level from the receiver 8, and the control unit 5 displays the discrimination result on the display unit. 6 to display.

次に、判別手段におけるノイズ判別処理について説明する。
図２は、その判別方法を示すフローチャートである。
制御部５は、ノイズの印加レベルを設定し（ステップＳＴ１）、その印加レベルを記憶する（ステップＳＴ２）。信号発生器４は、制御部５からの印加レベルに基づいてノイズ信号を発生させ、このノイズ信号がノイズ印加用プローブ３からケーブル２を介して試験対象物１に印加される（ステップＳＴ３）。ノイズ検出用プローブ１０は、試験対象物１から発生するノイズを検出し、このノイズ検出信号が受信機８に入力される（ステップＳＴ４）。制御部５は、受信機８に入力されたノイズ検出信号の検出レベルを記憶する（ステップＳＴ５）。その後、制御部５は印加レベルを変更し（ステップＳＴ６）、ステップＳＴ２に戻る。このようなステップＳＴ２〜ステップＳＴ６を数回繰り返し、印加レベルをステップ状に変化させて印加レベル毎のノイズ検出を行う。 Next, the noise discrimination process in the discrimination means will be described.
FIG. 2 is a flowchart showing the determination method.
The controller 5 sets the noise application level (step ST1) and stores the application level (step ST2). The signal generator 4 generates a noise signal based on the applied level from the control unit 5, and this noise signal is applied from the noise applying probe 3 to the test object 1 via the cable 2 (step ST3). The noise detection probe 10 detects noise generated from the test object 1, and this noise detection signal is input to the receiver 8 (step ST4). The control unit 5 stores the detection level of the noise detection signal input to the receiver 8 (step ST5). Then, the control part 5 changes an application level (step ST6), and returns to step ST2. Such steps ST2 to ST6 are repeated several times, and the application level is changed stepwise to detect noise for each application level.

所定数回のノイズ検出が行われると、判別器７は、検出レベルが印加レベルの変化量に追従した変化を得られたかを判定する（ステップＳＴ７）。ステップＳＴ７において、追従した変化を得られたと判定した場合、その位置は試験対象物１に接続されているケーブル２に印加したノイズが伝搬したと判断し、制御部５は、その位置でＭＡＸＨＯＬＤ値を表示部６に表示させ（ステップＳＴ８）、ノイズ検出用プローブ１０を次の位置に移動させるよう可動部９に指示を行う（ステップＳＴ９）。一方、ステップＳＴ７において、追従した変化が得られなかった場合、判別器７は、その位置では印加したノイズは伝搬しないと判定し、制御部５はその位置に対応した情報を表示部６には特に表示させずに、ノイズ検出用プローブ１０を次の位置に移動させるよう可動部９に指示を行う（ステップＳＴ９）。
以上のような処理を、試験対象物１上の全面にわたって実施し、試験対象物１に侵入したノイズの分布を測定する。 When the noise detection is performed a predetermined number of times, the discriminator 7 determines whether or not the detection level has obtained a change that follows the change amount of the applied level (step ST7). In step ST7, when it is determined that the following change has been obtained, it is determined that the noise applied to the cable 2 connected to the test object 1 has propagated, and the control unit 5 determines the MAXHOLD value at that position. Is displayed on the display unit 6 (step ST8), and the movable unit 9 is instructed to move the noise detection probe 10 to the next position (step ST9). On the other hand, if no follow-up change is obtained in step ST7, the discriminator 7 determines that the applied noise does not propagate at the position, and the control unit 5 displays information corresponding to the position on the display unit 6. An instruction is given to the movable portion 9 to move the noise detection probe 10 to the next position without displaying (step ST9).
The processing as described above is performed over the entire surface of the test object 1 and the distribution of noise that has entered the test object 1 is measured.

なお、上記例では、ノイズの印加レベルをステップ状に変化させたが、ノイズ印加の信号レベルの変化が検出できるものであればどのような波形状の変化であってもよく、例えばノイズ印加電圧を三角波状に変化させてもよい。
また、上記例では、試験対象物１を固定させ、ノイズ検出用プローブ１０側を移動させるよう構成したが、試験対象物１側を移動させるようにしてもよい。 In the above example, the noise application level is changed in steps. However, any change in waveform may be used as long as the change in the signal level of noise application can be detected, for example, the noise application voltage. May be changed to a triangular wave shape.
In the above example, the test object 1 is fixed and the noise detection probe 10 side is moved. However, the test object 1 side may be moved.

以上のように、実施の形態１のノイズ分布測定装置によれば、試験対象物に対してノイズを印加するノイズ印加手段と、試験対象物から発生するノイズを検出するためのノイズ検出手段と、試験対象物上の任意の検出位置で、ノイズ印加手段の印加レベルを予め決められた波形となるよう変化させ、ノイズ検出手段の検出レベルが予め決められた波形に追従した変化となる場合、検出位置に印加したノイズが伝搬したと判定する判別手段とを備えたので、試験対象物が出すノイズと外部から印加したノイズを分離することができ、外部から侵入したノイズに対する対策箇所の特定を容易に行うことができる。   As described above, according to the noise distribution measuring apparatus of the first embodiment, noise applying means for applying noise to the test object, noise detecting means for detecting noise generated from the test object, Detection is performed when the application level of the noise application means is changed to a predetermined waveform at any detection position on the test object, and the detection level of the noise detection means changes following the predetermined waveform. Since it has a discriminating means that determines that the noise applied to the position has propagated, the noise generated by the test object can be separated from the noise applied from the outside, making it easy to identify the countermeasures against the noise entering from the outside Can be done.

また、実施の形態１のノイズ分布測定装置によれば、判別手段は、ノイズ印加手段の印加レベルをステップ状に変化させるようにしたので、容易かつ確実に外部から侵入したノイズに対する対策箇所の特定を行うことができる。   In addition, according to the noise distribution measuring apparatus of the first embodiment, the discriminating unit changes the application level of the noise applying unit in a stepped manner, so that it is possible to easily and surely specify the countermeasure location for noise that has entered from the outside. It can be performed.

また、実施の形態１のノイズ分布測定装置によれば、判別手段は、ノイズ印加手段の印加レベルを三角波状に変化させるようにしたので、容易かつ確実に外部から侵入したノイズに対する対策箇所の特定を行うことができる。   In addition, according to the noise distribution measuring apparatus of the first embodiment, the discriminating means changes the application level of the noise applying means in a triangular wave shape, so that it is possible to easily and surely specify the countermeasure location for noise that has entered from the outside. It can be performed.

また、実施の形態１のノイズ分布測定装置によれば、ノイズ印加手段は、試験対象物に対して電気的に接続されたケーブルにノイズを印加するノイズ印加用プローブと、ノイズ印加用プローブに信号を供給する信号発生器と、信号発生器で供給する信号を制御する制御部とを備え、ノイズ検出手段は、試験対象物上に位置するノイズ検出用プローブと、ノイズ検出用プローブで検出したノイズ検出信号を受信する受信機とを備え、判別手段は、制御部から出力した信号と、受信機で受信したノイズ検出信号とを比較してノイズが伝搬したか否かを判定する判別器とを備え、かつ、ノイズ検出結果を表示する表示部を備えたので、試験対象物に侵入したノイズの分布を測定するための装置を簡単な構成で実現することができる。   Further, according to the noise distribution measuring apparatus of the first embodiment, the noise applying means includes a noise applying probe for applying noise to a cable electrically connected to the test object, and a signal to the noise applying probe. And a control unit for controlling a signal supplied by the signal generator, and the noise detection means includes a noise detection probe located on the test object and noise detected by the noise detection probe. A receiver for receiving the detection signal, and the discriminating means comprises a discriminator for comparing the signal output from the control unit and the noise detection signal received by the receiver to determine whether or not the noise has propagated. In addition, since the display unit for displaying the noise detection result is provided, an apparatus for measuring the distribution of noise that has entered the test object can be realized with a simple configuration.

なお、本願発明はその発明の範囲内において、実施の形態の任意の構成要素の変形、もしくは実施の形態の任意の構成要素の省略が可能である。   In the present invention, any constituent element of the embodiment can be modified or any constituent element of the embodiment can be omitted within the scope of the invention.

１ 試験対象物、２ ケーブル、３ ノイズ印加用プローブ、４ 信号発生器、５ 制御部、６ 表示部、７ 判別器、８ 受信機、９ 可動部、１０ ノイズ検出用プローブ。   DESCRIPTION OF SYMBOLS 1 Test object, 2 Cable, 3 Noise application probe, 4 Signal generator, 5 Control part, 6 Display part, 7 Discriminator, 8 Receiver, 9 Movable part, 10 Noise detection probe.

Claims (4)

試験対象物に対してノイズを印加するノイズ印加手段と、
前記試験対象物から発生するノイズを検出するためのノイズ検出手段と、
前記試験対象物上の任意の検出位置で、前記ノイズ印加手段の印加レベルを予め決められた波形となるよう変化させ、前記ノイズ検出手段の検出レベルが前記予め決められた波形に追従した変化となる場合、当該検出位置に印加したノイズが伝搬したと判定する判別手段とを備えたことを特徴とするノイズ分布測定装置。 Noise applying means for applying noise to the test object;
Noise detection means for detecting noise generated from the test object;
At any detection position on the test object, the application level of the noise application unit is changed to have a predetermined waveform, and the detection level of the noise detection unit changes following the predetermined waveform. In this case, the noise distribution measuring apparatus includes: a determination unit that determines that the noise applied to the detection position has propagated. 判別手段は、ノイズ印加手段の印加レベルをステップ状に変化させることを特徴とする請求項１記載のノイズ分布測定装置。   2. The noise distribution measuring apparatus according to claim 1, wherein the discriminating means changes the application level of the noise applying means in a step-like manner. 判別手段は、ノイズ印加手段の印加レベルを三角波状に変化させることを特徴とする請求項１記載のノイズ分布測定装置。   2. The noise distribution measuring apparatus according to claim 1, wherein the discriminating means changes the application level of the noise applying means in a triangular wave shape. ノイズ印加手段は、試験対象物に対して電気的に接続されたケーブルにノイズを印加するノイズ印加用プローブと、当該ノイズ印加用プローブに信号を供給する信号発生器と、前記信号発生器で供給する信号を制御する制御部とを備え、
ノイズ検出手段は、前記試験対象物上に位置するノイズ検出用プローブと、当該ノイズ検出用プローブで検出したノイズ検出信号を受信する受信機とを備え、
判別手段は、前記制御部から出力した信号と、前記受信機で受信したノイズ検出信号とを比較してノイズが伝搬したか否かを判定する判別器とを備え、
かつ、ノイズ検出結果を表示する表示部を備えたことを特徴とする請求項１から請求項３のうちのいずれか１項記載のノイズ分布測定装置。 The noise applying means includes a noise applying probe that applies noise to a cable electrically connected to the test object, a signal generator that supplies a signal to the noise applying probe, and a signal generator that supplies the signal. A control unit for controlling the signal to be
The noise detection means comprises a noise detection probe located on the test object, and a receiver that receives a noise detection signal detected by the noise detection probe,
The discriminating means includes a discriminator that determines whether noise has propagated by comparing the signal output from the control unit and the noise detection signal received by the receiver,
The noise distribution measuring device according to claim 1, further comprising a display unit that displays a noise detection result.
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