JP4657032B2 - Method and apparatus for measuring electromagnetic wave of electronic equipment - Google Patents

Description

The present invention relates to an electromagnetic wave measurement method and apparatus for an electronic device, and more particularly, to an electromagnetic wave of an electronic device that measures an electromagnetic wave from an electronic device that generates an electromagnetic wave, or its constituent elements and peripheral devices, mainly an unwanted electromagnetic wave component in a nearby electromagnetic field. The present invention relates to a measurement method and apparatus.

  In recent years, regulations have been established in many countries in order to prevent unwanted radiation generated from various electronic devices from interfering with other devices or being harmful to living bodies. For example, standards such as FCC (Federal Communications Commission), CISPR (International Special Committee on Radio Interference), and VDE (German Electrical Engineers Association) are established overseas. Even in Japan, the voluntary regulation standards of VCCI (Council for Voluntary Regulation of Radio Wave Interference) are established.

The regulation of these unnecessary radiations, that is, unnecessary electromagnetic waves, is generally established for each frequency over a wide range of 30 MHz to 1 GHz. Radio waves from ultra-long waves of TV to microwaves and mobile phones are included.

An electromagnetic wave is a wave that vibrates as a pair of an electric field and a magnetic field, and transmits electromagnetic energy to the space.Measurement of unwanted electromagnetic waves targets the electric field strength at a predetermined distance from the electronic device that is the source. The measurement environment and measurement equipment are special, such as by measuring the intensity of electromagnetic waves in the vicinity and blocking external noise. For this reason, the measurement requires considerable technical skill and takes time.

  Therefore, in recent years, measurement time and cost have been reduced by using an electromagnetic wave measuring device that measures the intensity of a nearby electromagnetic wave radiated from various circuit devices such as a printed circuit board circuit of an electronic device. As such a measuring device, for example, an electric field or magnetic field strength is measured in the vicinity of an electronic device using an electric field or magnetic field sensor, a frequency spectrum is created based on the maximum value of the magnetic field strength, It is known to create an electromagnetic field intensity distribution with a strong frequency and search for a radiation noise source, analyze a radiation noise generation mechanism, confirm a countermeasure effect, and the like (see, for example, Patent Document 1). In addition, a plurality of antenna elements are used to receive an electromagnetic wave radiated from a measured object with an antenna arranged with a distance from the measured object, and to detect an electromagnetic radiation pattern from the measured object from the received information. There is also known a technique in which the measurement time is shortened by using an arranged antenna array (for example, see Patent Document 2).

In any case, in order to identify the cause and location of unwanted electromagnetic waves radiated from electronic devices, use one or a limited number of receiving units with directivity from the object to be measured. It is necessary to scan and measure the entire range of the near electromagnetic field, and as described in Patent Documents 1 and 2, scan at a position separated by a certain distance in the near magnetic field range from the object to be measured. I have to.
JP 2002-372558 A JP 2004-77336 A

By the way, the measurement of unnecessary electromagnetic waves when using an antenna b such as that described in Patent Document 2 in which the reception range for the object to be measured a widens according to the measurement distance D as shown in FIG. 9 will be described. As shown in FIG. 9A, the measured distance D _S
While increased the resolution of the received easily measured by the smaller antenna b, the reception area, that is small and the reception area A _S. Reception area A _S and (schematic drawing n = 48 shown in to FIG. 9 (c)) number N n that small is to measure scan the entire range of the measurement range and long time measured by momentum increases t = It takes time and trouble with Tn. When this is set large as shown in FIG. 9B within the measurement distance D _L and the nearby electromagnetic field range, the reception area A _L increases and the number of scans N is m (FIG. 9C
) Corresponding to the schematic diagram shown in FIG. 4), m = 12) and the measurement time is reduced to t = Tm. However, since the intensity of the received electromagnetic wave decreases rapidly and the resolution of measurement also decreases, high-precision measurement cannot be performed.

Therefore, high-precision measurement is indispensable for providing products that do not have the problem of unwanted electromagnetic waves. Today, unnecessary electromagnetic wave components are not generated to measure unwanted electromagnetic waves at the product design and production stages. 9C, the entire electromagnetic wave generation area from the object to be measured a shown in FIG. 9C is required to be scrutinized and measured with high resolution at a small measurement distance D _L and reception area A _L. It takes a long time and causes an increase in product cost.

An object of the present invention is to provide an electromagnetic wave measuring method and apparatus for an electronic apparatus that can perform highly accurate measurement in a short time.

In order to achieve the above object, an electromagnetic wave measuring method for an electronic device according to the present invention is directed to an electromagnetic wave by sequentially scanning a receiving area toward a measured object with a directional antenna probe that expands the receiving area according to a measurement distance. in the electromagnetic wave measurement method of an electronic device for measuring the electromagnetic interference components by receiving component, the measurement distance from the object to be measured, the upper limit of 50 mm, a lower limit of 5 mm, pre magnitude only two settings, the person has a size No. The first reception area unit at a smaller second measurement distance with respect to the first reception area unit that is moved and scanned for each first reception area at one measurement distance and the unnecessary electromagnetic wave component is measured. When the unnecessary electromagnetic wave component that moves and scans for each of a plurality of smaller second reception areas and is measured at the first measurement distance does not vary in the measurement at the second measurement distance, the unnecessary electromagnetic wave component Is outpatient It is mainly characterized to be excluded from the determined measurement data to be size.

In such a configuration, the antenna probe is mainly used within the target near electromagnetic field range.
, 50mm is the upper limit, 5mm is the lower limit, and only two large and small are set in advance , moving at the first first measurement range at the larger first measurement range and preceding scanning, and a large reception area measures per full range of electromagnetic radiation range from the transfer times less DUT reception area by, Ru can identify the reception range electromagnetic interference component is measured. Next, for the first reception area unit in which the specified unnecessary electromagnetic wave component is measured, the second reception area unit moves at a smaller second measurement distance for each of a plurality of second reception areas smaller than the first reception area unit, and While scanning and measuring with high resolution due to small measurement distance and small reception area , the measurement target area is limited, so the reception area is small, but the measurement can be completed in a short time, and at the first measurement distance When the measured unnecessary electromagnetic wave component does not vary in the measurement at the second measurement distance, the unnecessary electromagnetic wave component can be measured with high accuracy and at high speed as being an external noise at the measurement position . It should be noted that the degree of scrutiny improves as the number of repetitions of measurement according to the above-described context at different measurement distances increases. In addition, the unnecessary electromagnetic wave from the object to be measured should increase as the measurement distance decreases, and if this does not increase, it is judged as external noise from the far electromagnetic field that does not affect the difference in measurement distance and is excluded from the measurement data. Can be enhanced.

As an electromagnetic wave measuring apparatus that achieves such a method, an antenna probe that receives an electromagnetic wave component having a directivity that expands a reception area according to a measurement distance, and the antenna probe and a device under test are combined in a reception area unit of the antenna probe. scanning means you scanned moved relative to, a measurement distance changing means to measure distance, 50 mm an upper limit, which is set large and small only advance that the lower limit 5mm switching between the antenna probe and the DUT, the antenna probe There a reception processing means for reception processing by receiving the transmission of electromagnetic wave information received, at the first measurement distance towards have large moving each first reception area unit, and scanned, unwanted electromagnetic wave components are measured With respect to the first reception area unit, a smaller second measurement distance moves for each of a plurality of second reception areas that are smaller than the first reception area unit, and scans. The electromagnetic interference components measured by the first measurement distance, the absence fluctuation in the measurement in the second measurement distance, the electromagnetic interference component and a judgment exclude measurement control unit from the measurement data to be external noise It is enough to have a feature.

When the unnecessary electromagnetic wave component measured at a large measurement distance is not increased by measurement at a small measurement distance, the unnecessary electromagnetic wave component is determined to be external noise.
The unnecessary electromagnetic wave from the object to be measured should increase as the measurement distance decreases. If the measurement distance does not increase, it can be determined as external noise from a far electromagnetic field that is not affected by the difference in measurement distance.

In a further configuration, the unnecessary electromagnetic wave component to be measured is the frequency or intensity in the near electromagnetic field of interest .
Unwanted electromagnetic wave components can be measured and evaluated for each frequency, for each intensity, and for both.

In the electromagnetic wave measuring apparatus, the antenna probe has an amplifier that amplifies and outputs reception information input between the antenna probe and the reception unit, and a direct transmission path for transmitting the reception information at the antenna probe directly to the reception unit, and the antenna probe In a further configuration comprising a switching means for switching and selecting the amplification transmission path for transmitting the reception information at the receiver to the reception unit via the amplifier,
In the case of an object to be measured that has a low reception level of unwanted electromagnetic wave components by the antenna probe and may not fall within the range of the reception dynamic range on the measurement unit side, the amplification transmission path via the amplifier is selected and received. It can be measured within the range.

In a further configuration, the switching means cuts off the electrical input on both the input side and the output side of the amplifier in the direct transmission path selection switching state,
In the direct transmission path selection state without going through the amplifier, by cutting off the electrical input on both the input side and the output side of the amplifier, the electric field and magnetic field due to the current flowing and the electromagnetic wave due to them are not generated, of course, An electric field due to application of a voltage may not be generated.

  Further objects and features of the present invention will become apparent from the following detailed description and drawings. Each feature of the present invention can be employed by itself or in combination in various combinations.

According to the electromagnetic wave measurement method and apparatus of the present invention, the measurement distance from the object to be measured with respect to the antenna probe can be measured in two ways with a difference in preset resolutions of only two large and small with an upper limit of 50 mm and a lower limit of 5 mm. using timely, the number of scans for the measurement, increased measurement speed is reduced without lowering the measurement accuracy, highly accurate measurement can be achieved in a short time, the safety for other equipment and biological products High price can be provided at low cost. At the same time, the unnecessary electromagnetic wave from the object to be measured increases as the measurement distance decreases, and if this does not increase, it is determined as external noise and can be excluded from the measurement data to increase the measurement accuracy.

  Unnecessary electromagnetic wave components can be measured and evaluated for each frequency, for each intensity, and for both.

  In addition, in the case of an object to be measured that has a low reception level of unnecessary electromagnetic wave components by the antenna probe and may not fall within the range of the reception dynamic range on the measurement unit side, it can be amplified and measured within the range by an amplifier. it can.

  Also, depending on the switching to the reception state without passing through the amplifier, the electric field and magnetic field due to the current flowing through the amplifier and the electromagnetic wave due to them do not occur, and the electric field due to the voltage is not generated. You can avoid things that get in the way.

An electromagnetic wave measuring method and apparatus for an electronic apparatus according to an embodiment of the present invention will be described below with reference to the drawings for understanding of the present invention. The following description is a specific example of the present invention and does not limit the scope of the claims.

As shown in FIG. 1, the electromagnetic wave measuring method for an electronic device according to the present embodiment receives an unnecessary electromagnetic wave from an object to be measured 1 that generates an electromagnetic wave , which is an electronic device , by an antenna probe 2 and uses an electromagnetic wave measuring device 3. It is an example in the case of measurement, and the antenna probe 2 is only required to be able to receive unnecessary electromagnetic wave components or radio waves in a range that causes problems on peripheral devices and living organisms. Adopt something. These include loop antennas and minute dipole antennas. However, it is not limited to these. The measurement is performed mainly in the vicinity of the electromagnetic wave range, and the measurement distance D of the antenna probe 2 from the object to be measured 1 is preferably set to an upper limit of, for example, about 50 mm in consideration of the minimum resolution. A corresponding reception area A is obtained. Further, if the measurement distance D is reduced, the reception area A is correspondingly reduced. To measure the entire measurement area A0 of the DUT 1, the reception area of the antenna probe 2 is set to the entire measurement area A0. The number of times of scanning in the XY2 direction increases rapidly. That is, it is the square of the reciprocal of the rate at which the measurement distance is reduced. Therefore, when viewed in a range where necessary and sufficient measurement resolution can be obtained without increasing the number of scans, about 5 mm is effective as the lower limit of the measurement distance D.

From the relationship between wide and narrow reception area A and the number of scans N when measured distance D and as described above, in this embodiment the measurement distance D and D _L, D _S magnitude more settings, such as shown in FIG. 2 Figure 2
From it were measured by wide scanning by scanning in the XY two directions with large measurement distance D _L shown in (a), a plurality of measurements of scans in the XY two directions with a small measurement distance D _S shown in FIG. 2 (b) The measurement is performed once, and the measurement by the narrow range scan at the small measurement distance D _S is performed for the reception areas A1, A2, and A3 where the unnecessary electromagnetic wave component is measured at the large measurement distance D _L. Thus, the magnitude measurement distance D _L is set in the vicinity of the electromagnetic field range, according to D _S, preceding the wide limits scan measurements at large measurement distance D _L, received for the measurement required range A0 by a large reception area area A _L The number of movements or scannings of the area is reduced as N = m = 12 from the schematic diagram, and measurement is performed for the necessary electromagnetic wave emission area A0 from the DUT 1, and the reception areas A1 to A1 in which unnecessary electromagnetic wave components are measured. A3 etc. can be specified without overlooking. Furthermore, the narrow range while measuring with high resolution by scanning the measurement target region is N = n from schematic diagram to as reception area A1~A3 with a small measurement distance D _S per such reception area A1~A3 that this particular = 3, so that the reception area A _S is small, but the measurement can be completed in a short time. Therefore, the generation and position of unnecessary electromagnetic wave components can be measured with high accuracy and at high speed, and the feature is that the maximum measurement distance D _{L is set} to the upper limit of 50 mm and the minimum measurement distance D _{S is set} to the lower limit of 5 mm. Demonstrated.

In the present embodiment from the above, the measurement distance D D _L, using timely measurement there is a difference in resolution in which a plurality set such D _S, N without lowering the measurement accuracy of the total number of scans for measurement = N + m = 15 etc., and the measurement speed can be increased. As a result, highly accurate measurement can be achieved in a short time, and products that are highly safe for other devices and living bodies can be provided at low cost. Note that the degree of scrutiny improves as the number of repetitions of measurement according to the above-mentioned context at different measurement distances D increases, and for this, a plurality of measurement distances are set within a range of upper and lower measurement distances of about 50 mm to 5 mm. .

In order to achieve such a method, the electromagnetic wave measuring apparatus 3 of the electronic device has an electromagnetic wave component from the object 1 to be measured having a directivity in which the reception area is widened according to the measurement distance D described above, as shown in FIG. An antenna probe 2, a broadband receiver 4 as a receiver for receiving and processing the electromagnetic wave information received by the antenna probe 2, and the antenna probe 2 and the device under test 1. The XY driving unit 5a for scanning that moves relative to the reception area A of the antenna probe 2 in two XY directions and the measurement distance D between the antenna probe 2 and the DUT 1 are switched to a plurality, that is, moved in the Z direction. From the measurement at a large measurement distance, an unnecessary electromagnetic wave component is measured and processed from the received electromagnetic wave information input and processed by the Z driving unit 5b for changing the measurement distance and the broadband receiving unit 4. A measurement control unit 6 that performs measurement at a small measurement distance a plurality of times and performs measurement at a small measurement distance for a reception range in which an unnecessary electromagnetic wave component is measured at a large measurement distance, and a display unit 7 are provided. .

  Here, the broadband receiving unit 4 receives and processes unnecessary electromagnetic waves generated within a wide band range. Each of the XY drive unit 5a and the Z drive unit 5b is provided so as to scan the device under test 1 by driving the antenna probe 2 side in the XY directions. However, as shown in FIG. 4, scanning may be performed by driving the object 1 to be measured in the XY directions with respect to the antenna probe 2. However, in principle, the driving of XYZ can be shared between the antenna probe 2 side and the DUT 1 side. The measurement control unit 6 controls the operation of the antenna probe 2, the broadband receiving unit 4, the XY driving unit 5a, the Z driving unit 5b, the display unit 7 and the like in order to measure and evaluate unnecessary electromagnetic wave components.

  Further, depending on the device under test 1, the case of the device under test 1 or the like in which the reception level of the unnecessary electromagnetic wave component by the antenna probe 2 is low and may not fall within the reception dynamic range of the broadband receiving unit 4 is shown in FIG. In this manner, the amplifier 11 is provided between the antenna probe 2 and the broadband receiver 4 so that reception information input from the antenna probe 2 is amplified by the amplifier 11 and output to be transmitted to the broadband receiver 4. However, since the SN ratio decreases when the amplification factor is increased, it is preferable to suppress the amplification to about 6 dB. When the amplifier 11 is not necessary, it is preferable not to use the amplifier 11 in order to increase the measurement accuracy as much as possible. Therefore, in the case shown in FIG. 5, the direct transmission path 12 for directly transmitting the reception information at the antenna probe 2 to the broadband receiving unit 4 and the reception information at the antenna probe 2 to the broadband receiving unit 4 via the amplifier 11. A switching means 14 is provided for switching and selecting the amplified transmission path 13 for transmission, and by selecting and receiving the amplified transmission path 13 via the amplifier 11 only when necessary, it can be measured within the range of the reception dynamic range. Like that. In this case, the switching means 14 is provided with two changeover switches 14a and 14b for connecting and releasing the connection between the input side and the output side of the amplifier 11, and in the switching state shown in FIG. The electrical input on both the input side and the output side of 11 is cut off. As a result, in the selected state of the direct transmission path 12 that does not pass through the amplifier 11, by cutting off the electrical input on both the input side and the output side of the amplifier 11, the electric field and magnetic field caused by the current flowing through the amplifier 11 and those As a matter of course, the electric field due to the voltage can be prevented from being generated. Therefore, it is possible to avoid a measurement noise source when the amplifier 11 is not used.

Here, the measurement will be described in detail. It is assumed that the DUT 1 radiates unnecessary electromagnetic wave components. This is received by the antenna probe 2 and transmitted to the broadband receiver 4. The broadband receiving unit 4 performs a receiving process at the frequency or electric field level of the unnecessary electromagnetic wave from the unnecessary electromagnetic wave component transmitted from the antenna probe, and transmits it to the measurement control unit 6. The measurement control unit 6 performs data processing on the frequency and electric field level of the unnecessary electromagnetic waves that have been subjected to reception processing, and displays them on the display unit 7. The intensity distribution for each frequency can be displayed as a frequency spectrum as shown in FIG. According to this, the intensity | strength in the specific frequency used as the unnecessary electromagnetic wave which affects other apparatuses and ecology can each be determined, and it becomes a subject to take a countermeasure when higher than predetermined. In order to solve this problem, it is necessary to specify the generation source of electronic components, circuits, equipment, etc. in the DUT 1. For example, the electric field intensity distribution can be displayed in a so-called contour line-type striped state in which distribution areas of the same level are distinguished by at least one of different colors, shading, lines, etc. on XY coordinates as shown in FIG. In some cases, a numerical value indicating strength can be attached. In such electric field level display, it is possible to determine the generation area and generation position of a high electromagnetic field on the XY coordinate in the DUT 1, and by reducing the measurement distance D, the distribution is compounded from a plurality of generation sources. Even in such a case, it is possible to scrutinize the area by focusing on the electromagnetic wave source. Therefore, the generation source can be identified by displaying the electromagnetic field intensity distribution as shown in FIG. 7 for each frequency that has the electric field intensity as the problem. FIG. 7 shows an example of the near magnetic field distribution at a frequency of 900 MHz when a flat dipole antenna is used as the DUT 1. The contour line is 50 mA / m in the range of magnetic field strength of 0 to 700 mA / m. It is given every.

  However, if the intensity distribution for each frequency is combined and displayed on the XY coordinates, or on the XYZ coordinates with the Z axis as the intensity, the colors are distinguished and displayed at the same time. Can be evaluated at the same time. In this case, it is easier to evaluate the condition that the number of types of generated electromagnetic wave components is smaller or the generation position does not overlap. From this point of view, it is convenient for measurement to display only unnecessary electromagnetic wave components within the threshold range for each frequency that is a problem.

  In particular, the frequency spectrum shown in FIG. 6 shows the measurement value Af1 in the wide-range scan so that the measurement result in the wide-range scan is displayed in black and the measurement result in the narrow-range scan is displayed in white. There are types of measurement devices that are significantly higher than the measurement value Bf1 at the time of narrow-range scanning, and types of measurement values at which the measurement value Af2 at the time of wide-range scanning hardly varies even during narrow-range scanning. If the antenna probe 2 receives an electromagnetic wave in the near electromagnetic field range from the measured object 1, the measurement value fluctuates due to the fluctuation of the measurement distance D, and the electromagnetic wave from the far electromagnetic field is received. If it does, it means that even if the measurement distance D with respect to the DUT 1 fluctuates, there is no influence. From this relationship, even if it is detected as an unnecessary electromagnetic wave in a narrow range scan, if it does not vary from the detection level when it is detected in a wide range scan, it is determined as an external noise from a far electromagnetic field. Measurement accuracy can be improved by excluding the measurement data from the DUT 1.

  Although a specific measurement procedure is arbitrary, one example of measurement control by the measurement control unit 6 will be described with reference to FIG. First, input processing is performed in step ST1. This includes processing for a start operation, but also includes processing for a setting operation for a plurality of measurement distances D performed by a user. The measurement distance D needs to be set in at least two ways, large and small. If the measurement distance is not set for a predetermined time, it is determined that the measurement distance setting is ended by an end operation, and two or more measurement distances D are set. The rank is assigned in descending order, the rank counter is set to 1, and the process proceeds to step ST3 according to the start operation. Even if the measurement distance D is set and the start operation is performed, if two or more measurement distances D are not set, a warning to that effect is given to prompt the setting. If there are two or more measurement distances D that are initially set or changed after that, if there is no new setting for a predetermined time and there is a start operation, the rank counter is set to 1 and the process proceeds to step ST3. Even if there are two or more measurement distances D that are initially set or changed, if there is a setting operation without a start operation, the existing setting is cleared and a new setting is accepted according to the above procedure.

  If the rank counter is 1 in step ST3, the measurement is started, so the process moves to step ST4, the set measurement distance Dx (x = 1) corresponding to rank 1 is read, and the measurement distance Dx is read in step ST5. The measurement of the unnecessary electromagnetic wave component by the XY wide range scan and the acquisition of the measurement data are stored for the entire measurement required range A0 at (x = 1). Next, in step ST6, the rank counter is incremented by 1, and the process returns to step ST3. Here, when the rank counter is 2, the process proceeds to step ST8, where it is determined whether or not there is a set measurement distance Dx corresponding to the rank counter. Due to the distance Dx (x = 2), the process proceeds to step ST9. In step ST9, the set measurement distance Dx (x = 2) of the rank 2 corresponding to the current rank counter 2 is read, and in step ST10, the rank counter-1 at the measurement distance Dx (x = 2), that is, the XY wide range. Compared to the previous scan, a narrow-range scan is performed only in the reception area Ax (x = 1 to n) where the unnecessary electromagnetic wave component was measured last time, and the unnecessary electromagnetic wave component measured more closely than the previous time is measured. Capture and store the measurement data. Next, the process proceeds to step ST11, and the rank counter is incremented by 1. Then, in step ST12, it is determined whether or not there is a set measurement distance Dx (x = 3) of rank 3 corresponding to the rank counter 3. In step ST13, the measurement data is finally displayed in a format corresponding to the evaluation, and the unnecessary electromagnetic wave and its transmission position are specified. In the next step ST14, the measurement data between the measurement data Dx is further measured. Then, the data that does not have a predetermined fluctuation in the data value of the unnecessary electromagnetic wave is deleted from the unnecessary electromagnetic wave data measured as the external noise, and the measurement is finished. Of course, the unnecessary electromagnetic wave, its position, and the removal of the external noise in steps ST13 and ST14 can be automatically determined, but instead of this or in combination with this, a person can also determine from the data display. If there is a set measurement distance Dx (x = 3) of rank 3 corresponding to the rank counter 3 in step ST12, the process proceeds to step ST15, where the narrowness is set at the set measurement distance Dx (x = 2) corresponding to the current rank counter 2. The reception area Ax in which the unnecessary electromagnetic wave component is detected in the range scan is specified and stored, and after returning to step ST3, the measurement by the narrow range scan is repeated until the set measurement distance Dx disappears, and the measurement scrutiny To increase. The determination of the external noise at step ST14 is correctly performed between the measurement data at the two measurement distances Dx having the largest difference when the measurement corresponding to the set measurement distance Dx exceeding two is performed. Cheap.

  As described above, the measurement in the wide range scan is performed in advance for the entire measurement required range A0, and then the measurement in the narrow range scan is performed only in the reception range where the unnecessary electromagnetic wave component is measured in the wide range scan. However, in this procedure, every time the unnecessary electromagnetic wave component is measured in the entire measurement required range A0, the unnecessary electromagnetic wave component is measured every time the unnecessary electromagnetic wave component is measured. If this is not the case, it is possible to adopt a procedure for shifting to the next reception area as it is and continuing measurement in a wide range scan.

INDUSTRIAL APPLICABILITY The present invention can be practically used for measuring unnecessary electromagnetic waves in an electronic device that generates electromagnetic waves, and can increase the measurement speed.

It is a perspective view which shows the example of a measurement state by the wide range scanning system which the electromagnetic wave measuring method and apparatus of the electronic device which concern on embodiment of this invention employ | adopt. It is a perspective view which shows the example of a measurement state by the narrow range scanning system which the electromagnetic wave measuring method and apparatus of the electronic device which concern on embodiment of this invention employ | adopt. It is a block diagram which shows one example of the electromagnetic wave measuring device of the electronic device which concerns on embodiment of this invention. It is a block diagram which shows another example of the electromagnetic wave measuring device of the electronic device which concerns on embodiment of this invention. It is a block diagram which shows the other example of the electromagnetic wave measuring device of the electronic device which concerns on embodiment of this invention. It is a display graph which compares and shows the measurement data example at the time of a wide range scan, and the measurement data example at the time of a narrow range scan regarding the intensity according to frequency of the unnecessary electromagnetic wave component measured. It is a display graph which shows XY intensity distribution regarding the unnecessary electromagnetic wave of the specific frequency measured. It is a flowchart which shows the example of measurement control. Using an antenna probe with specific directivity, the front view when measuring unnecessary electromagnetic waves with narrow range scan, the front view when measuring with wide range scan, and the XY operation state in narrow range scan It is a perspective view shown.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Measured object 2 Antenna probe 3 Electromagnetic wave measuring device 4 Broadband receiving part 5a XY drive part 5b Z drive part 6 Measurement control part 7 Display part 11 Amplifier 12 Direct transmission path 13 Amplification transmission path 14 Switching means 14a, 14b Changeover switch

Claims (6)

In the electromagnetic wave measurement method of electronic equipment that scans the reception area sequentially with the directional antenna probe that extends the reception area according to the measurement distance to the object to be measured, receives the electromagnetic wave component, and measures the unnecessary electromagnetic wave component,
The distance measured from the object to be measured, 50 mm an upper limit, the lower limit of 5 mm, pre magnitude only two settings, in a first measurement distance towards have large moving each first reception area unit, and scans , About the first reception area unit in which the unnecessary electromagnetic wave component is measured, move to a plurality of second reception areas smaller than the first reception area unit at a second measurement distance which is smaller, and scan,
Wherein the electromagnetic interference components measured by the first measurement distance, the absence fluctuation in the measurement in the second measurement distance, the electromagnetic interference component is characterized by excluding from the measurement data determined to be external noise Electromagnetic wave measurement method for electronic equipment . The electromagnetic wave measuring method for an electronic device according to claim 1, wherein the unnecessary electromagnetic wave component to be measured is a frequency or intensity of an electromagnetic wave in a target near electromagnetic field. An antenna probe that receives an electromagnetic wave component with directivity that expands the reception range according to the measurement distance, and the antenna probe and the object to be measured are moved relative to each other within the reception range of the antenna probe.
A scanning means that to scan, the distance measured between the antenna probe and the object to be measured, 50 mm an upper limit, and large and small only replaced Ri Setsu preset measurement distance changing means that the lower limit 5 mm, the antenna probe is received a reception processing means for reception processing by receiving the transmission of electromagnetic wave information, the first measurement distance towards have large moving each first reception area unit, and scanned, the first unnecessary wave component is measured About 1 receiving zone unit, the second measurement distance of the smaller, go to each of the second reception area smaller plurality than the first receiving zone unit, and scanned, the unnecessary measured in the first measurement distance electromagnetic component, wherein the absence fluctuation in the measurement in the second measurement distance, the electromagnetic interference component waves of the electronic device, characterized in that a determination was excluded measurement control unit from the measurement data to be external noise Measuring apparatus. It has an amplifier that amplifies the reception information input between the antenna probe and the receiving unit and outputs it, a direct transmission path for transmitting the reception information at the antenna probe directly to the receiving unit, and an amplifier for the reception information at the antenna probe The electromagnetic wave measuring apparatus of the electronic device according to claim 3, further comprising a switching unit that switches and selects an amplification transmission path that transmits to the transmission unit via. 5. The electromagnetic wave measuring apparatus for an electronic device according to claim 4, wherein the switching unit cuts off the electrical input on both the input side and the output side of the amplifier in the direct transmission path selection switching state. The plurality of measurement distances are set within a target near electromagnetic field range.
The electromagnetic wave measuring apparatus of the electronic device as described in a term.

Images