WO2023223414A1 - Frequency band estimation device, frequency band estimation method, ems testing method, and frequency band estimation program - Google Patents

Frequency band estimation device, frequency band estimation method, ems testing method, and frequency band estimation program Download PDF

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Publication number
WO2023223414A1
WO2023223414A1 PCT/JP2022/020490 JP2022020490W WO2023223414A1 WO 2023223414 A1 WO2023223414 A1 WO 2023223414A1 JP 2022020490 W JP2022020490 W JP 2022020490W WO 2023223414 A1 WO2023223414 A1 WO 2023223414A1
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frequency band
vulnerable
under test
frequency
test
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PCT/JP2022/020490
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French (fr)
Japanese (ja)
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雄一郎 奥川
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日本電信電話株式会社
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Priority to PCT/JP2022/020490 priority Critical patent/WO2023223414A1/en
Publication of WO2023223414A1 publication Critical patent/WO2023223414A1/en

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
    • G01R29/08—Measuring electromagnetic field characteristics
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
    • G01R29/08—Measuring electromagnetic field characteristics
    • G01R29/10—Radiation diagrams of antennas
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/28—Testing of electronic circuits, e.g. by signal tracer
    • G01R31/30—Marginal testing, e.g. by varying supply voltage

Definitions

  • the present invention relates to a frequency band estimation device, a frequency band estimation method, an EMS test method, and a frequency band estimation program.
  • EMC Electromagnetic Compatibility
  • EMS Electromagnetic Susceptibility test
  • Non-Patent Document 1 When conducting the EMS test disclosed in the above-mentioned Non-Patent Document 1, a dedicated test equipment suitable for the standard is used, and a test signal simulating interference waves is transmitted to the equipment under test at a certain frequency. It is necessary to sweep the signal across the band. Therefore, there is a problem that the EMS test requires a long time.
  • the present invention has been made in view of the above circumstances, and its purpose is to estimate the required frequency band and shorten the EMS test when conducting an EMS test of a device to be measured.
  • An object of the present invention is to provide a frequency band estimating device, a frequency band estimating method, an EMS test method, and a frequency band estimating program that can perform the following.
  • a frequency band estimating device includes a measuring device that sweeps a measurement signal in a predetermined frequency band and supplies it to a device under test, and measures the frequency characteristics of the device under test with respect to the measurement signal; and a calculation device that estimates a vulnerable frequency band in which the device under test is vulnerable to external signals based on the frequency characteristics.
  • a frequency band estimation method includes the steps of: sweeping a measurement signal in a predetermined frequency band and supplying the same to a device under test; and measuring the frequency characteristics of the device under test with respect to the measurement signal; and estimating a vulnerable frequency band in which the device under test is vulnerable to external signals based on frequency characteristics.
  • An EMS test method includes the steps of: sweeping a measurement signal in a predetermined frequency band and supplying it to a device under test; measuring the frequency characteristics of the device under test with respect to the measurement signal; estimating a vulnerable frequency band in which the device under test is vulnerable to external signals based on characteristics; and performing an EMS test on the device under test only in the vulnerable frequency band using an EMS test device. and a step of doing so.
  • One aspect of the present invention is a frequency band estimating program for causing a computer to function as the frequency band estimating device.
  • the present invention when performing an EMS test on a device to be measured, it is possible to estimate the required frequency band, and it is possible to shorten the time required for the EMS test.
  • FIG. 1 is a block diagram showing the configuration of a frequency band estimating device according to an embodiment.
  • FIG. 2 is a block diagram showing the configuration of the EMS test device.
  • FIG. 3 is a graph showing the emission level and impedance frequency characteristics of the EUT.
  • FIG. 4 is a graph showing the frequency characteristics of the product of emission level and impedance.
  • FIG. 5 is a block diagram showing the hardware configuration of this embodiment.
  • FIG. 1 is a block diagram showing the configuration of a frequency band estimating device 1 according to an embodiment.
  • FIG. 2 is a block diagram showing the configuration of an EMS test device 100 that performs an EMS test.
  • the EMS test device 100 connects probes 31 and 32 to two measurement points 21 and 22 provided on the equipment under test 2 (hereinafter referred to as "EUT 2 (Equipment Under Test)") that tests external signals such as interference waves.
  • EUT 2 Equipment Under Test
  • EMS test of EUT2 will be carried out.
  • the measurement points 21 and 22 may be input/output points for communication signals, input/output points for control signals, or input/output points for electric power provided in the EUT 2.
  • the purpose of the EMS test is to evaluate the immunity of EUT2 in the expected electromagnetic environment.
  • the EMS test device 100 supplies a test signal simulating an interference wave by sweeping the frequency in a predetermined band to each measurement point 21, 22 of the EUT 2, and confirms the operation of the EUT 2.
  • the EMS test device 100 includes coupling/decoupling circuit networks 4A, 4B (hereinafter referred to as "CDN 4A, 4B (Coupling Decoupling Network)”), auxiliary equipment 5A, 5B, an amplifier 6, a terminating resistor 7, and a test A signal generator 8 is provided.
  • CDN 4A, 4B Coupling Decoupling Network
  • the CDN 4A is provided between the measurement point 21 and the auxiliary equipment 5A, supplies a test signal such as an RF signal to the EUT 2, and measures the signal generated by the EUT 2.
  • the CDN 4A has the role of preventing signals from flowing into the auxiliary device 5A.
  • the CDN 4B is provided between the measurement point 22 and the auxiliary equipment 5B, supplies a test signal such as an RF signal to the EUT 2, and measures the signal generated by the EUT 2.
  • the CDN 4B has the role of preventing signals from flowing into the auxiliary device 5B.
  • the test signal generator 8 generates a test signal simulating an interference wave and outputs it to the amplifier 6.
  • the test signal generator 8 sweeps the frequency of the test signal within a certain frequency range and outputs the same.
  • the amplifier 6 amplifies the test signal output from the test signal generator 8 and outputs it to the CDN 4B.
  • the terminating resistor 7 is a resistor installed between the CDN 4A and the ground.
  • the frequency band estimating device 1 includes a measuring device 11 and an arithmetic device 12.
  • the measuring device 11 sweeps and supplies a measurement signal in a predetermined frequency band to the measurement points 21 and 22 of the EUT 2, and measures the frequency characteristics of the EUT 2.
  • the frequency of the measurement signal approaches or matches the frequency of various signals such as clock signals, synchronization signals, switching signals, and pilot signals used in the EUT 2
  • the emission level output from the measurement points 21 and 22 of the EUT 2 increases.
  • "Emission level” is the level of an output signal relative to an input signal. Furthermore, the impedance between the measurement points 21 and 22 is reduced.
  • the measuring device 11 measures the frequency characteristics of the emission level emitted from the EUT 2 with respect to the measurement signal supplied in a swept manner.
  • the measuring device 11 measures the frequency characteristics of impedance between two measurement points 21 and 22.
  • the measuring device 11 may measure the frequency characteristics of either the emission level or the impedance of the EUT 2, as shown in a first modification example and a second modification example described later.
  • an impedance analyzer for example, an impedance analyzer, a network analyzer, or a spectrum analyzer can be used.
  • the impedance analyzer supplies measurement signals to the measurement points 21 and 22 of the EUT 2 while changing the frequency.
  • the impedance analyzer measures the voltage, current, and phase applied to the EUT 2 to measure impedance characteristics with respect to frequency changes. That is, by using an impedance analyzer, the impedance characteristics of the EUT 2 can be measured.
  • the network analyzer supplies a measurement signal to the measurement point of the EUT 2 while changing the frequency, and measures the passing power and reflected power at the measurement point.
  • the spectrum analyzer supplies measurement signals to the measurement points 21 and 22 of the EUT 2 while changing the frequency, and measures the power of the EUT 2.
  • a spectrum analyzer displays a two-dimensional graph on the screen with frequency on the horizontal axis and power or voltage on the vertical axis. That is, the emission level of the EUT 2 can be measured using a network analyzer or a spectrum analyzer.
  • the arithmetic device 12 includes an input section 121, a multiplication section 122, and an estimation section 123.
  • the input unit 121 obtains the absolute value of the emission level
  • the multiplier 122 multiplies the absolute value of the emission level
  • to calculate a multiplication value X1 (
  • the estimation unit 123 compares the multiplication value X1 with a predetermined first threshold Th1, and obtains a frequency band Fx (see FIG. 4 described later) in which the multiplication value X1 exceeds the first threshold Th1 (X1>Th1). do.
  • the estimation unit 123 estimates this frequency band Fx as a vulnerable frequency band Fx in which the EUT 2 is vulnerable to external signals such as interference waves.
  • the vulnerable frequency band Fx means a frequency band in which the EUT 2 is easily affected by external signals and malfunctions.
  • the estimation unit 123 outputs the estimated vulnerable frequency band Fx to a subsequent device.
  • the vulnerable frequency band Fx estimated by the estimation unit 123 is displayed, for example, on a display (not shown). The user can recognize the vulnerable frequency band Fx of the EUT 2 by looking at the display.
  • FIG. 3 is a graph showing an example of the frequency characteristics of the emission level Ve and impedance Zc of the EUT 2.
  • a curve P1 shown in FIG. 3 shows the frequency characteristics of the emission level Ve, and a curve P2 shows the frequency characteristics of the impedance Zc.
  • the emission level Ve is increasing in the frequency band f1 to f2, and exceeds the threshold Th2 (second threshold described later).
  • the impedance Zc decreases in the frequency band f3 to f4, and is below a threshold Th3 (a third threshold to be described later). That is, it can be seen that the EUT 2 is vulnerable to interference waves having frequencies in the frequency bands f1 to f2 and f3 to f4.
  • the multiplier 122 obtains the emission level Ve and the impedance Zc, and multiplies them by their respective absolute values
  • the estimation unit 123 obtains the multiplication value X1 (
  • FIG. 4 is a graph showing the frequency characteristics of the multiplication value X1.
  • a curve P3 shown in FIG. 4 indicates the multiplication value X1 (
  • the estimation unit 123 estimates that the frequency band in which the multiplication value X1 shown in the curve P3 exceeds the predetermined first threshold Th1 is a vulnerable frequency band in which the EUT 2 is vulnerable to external signals.
  • the estimation unit 123 outputs the estimated vulnerable frequency band information to the outside. Information on vulnerable frequency bands is displayed on a display and notified to the user, for example.
  • the calculation device 12 estimates the vulnerable frequency band in which the EUT 2 (device under test) is vulnerable to external signals such as interference waves, based on the frequency characteristics.
  • the arithmetic device 12 determines a frequency band in which a multiplication value "
  • the user When carrying out an EMS test with the EMS test apparatus 100 shown in FIG. 2, the user sets the frequency of the test signal output by the test signal generator 8 to the vulnerable frequency band estimated by the above processing.
  • the test signal generator 8 may carry out the EMS test in the vulnerable frequency band estimated by the above processing.
  • the frequency band estimating device 1 sweeps a measurement signal in a predetermined frequency band and supplies it to the equipment under test (EUT 2), and performs a measurement to measure the frequency characteristics of the EUT 2 with respect to the measurement signal. and an arithmetic device 12 that estimates a vulnerable frequency band in which the EUT 2 is vulnerable to external signals based on frequency characteristics.
  • the test signal generator 8 when carrying out an EMS test with the EMS test device 100, the test signal generator 8 does not need to sweep the frequency over the entire frequency band to be tested; EMS tests can be conducted in vulnerable frequency bands. Therefore, it becomes possible to shorten the time required for the EMS test.
  • the measuring device 11 supplies a measurement signal to at least one of a communication signal input/output point, a control signal input/output point, and a power input/output point provided in the EUT 2. Therefore, the measuring device 11 can be easily connected to the EUT 2, and the emission level Ve and impedance Zc can be measured with high precision.
  • the emission level Ve exceeds the second threshold Th2 in a part of the frequency band f1 to f2. Therefore, this band is estimated to be a vulnerable frequency band.
  • the measuring device 11 measures the frequency characteristics of the emission level Ve output from the EUT 2, and the arithmetic device 12 defines the frequency band in which the emission level Ve exceeds the second threshold Th2 as a vulnerable frequency. Estimate as band.
  • the vulnerable frequency band is estimated based on the emission level Ve measured by the EUT 2, so the vulnerable frequency band can be estimated by simple measurement. Furthermore, as in the embodiment described above, the frequency band for conducting the EMS test can be limited to the vulnerable frequency band, so the time required for the EMS test can be shortened.
  • the impedance Zc is below the predetermined third threshold Th3 in the frequency band f3 to f4. Therefore, this band is estimated to be a vulnerable frequency band.
  • the measuring device 11 measures the frequency characteristic of the impedance Zc between the measuring points 21 and 22, and the arithmetic device 12 defines the frequency band in which the impedance Zc is below the third threshold Th3 as a vulnerable frequency. Estimate as band.
  • the vulnerable frequency band is estimated based on the impedance Zc measured by the EUT 2, so the vulnerable frequency band can be estimated by simple measurement. Furthermore, as in the embodiments described above, the frequency band for conducting the EMS test can be limited to the vulnerable frequency band, so the time required for the EMS test can be shortened.
  • the arithmetic device 12 installed in the frequency band estimating device 1 of the present embodiment described above includes, for example, a CPU (Central Processing Unit, processor) 901, a memory 902, and a storage 903 (HDD: A general-purpose computer system including a HardDisk Drive (SSD: Solid State Drive), a communication device 904, an input device 905, and an output device 906 can be used.
  • Memory 902 and storage 903 are storage devices.
  • each function of the arithmetic unit 12 is realized by the CPU 901 executing a predetermined program loaded onto the memory 902.
  • the arithmetic device 12 may be implemented by one computer or by multiple computers. Further, the arithmetic device 12 may be a virtual machine implemented in a computer.
  • the program for the arithmetic unit 12 may be stored in a computer-readable recording medium such as an HDD, SSD, USB (Universal Serial Bus) memory, CD (Compact Disc), or DVD (Digital Versatile Disc), or it may be stored on a network. It can also be distributed via.
  • a computer-readable recording medium such as an HDD, SSD, USB (Universal Serial Bus) memory, CD (Compact Disc), or DVD (Digital Versatile Disc), or it may be stored on a network. It can also be distributed via.
  • Frequency band estimation device 2 EUT (device under test) 4A, 4B CDN (coupling/decoupling network) 5A, 5B Auxiliary equipment 6 Amplifier 7 Termination resistor 8 Test signal generator 11 Measuring device 12 Arithmetic device 21, 22 Measurement points 31, 32 Probe 121 Input section 122 Multiplying section 123 Estimating section 100 EMS test equipment

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Abstract

This frequency band estimation device comprises: a measuring instrument (11) that supplies a measurement signal to an EUT (2) while sweeping in a predetermined frequency band, to measure frequency characteristics of the EUT (2) with respect to the measurement signal; and an arithmetic device (12) that estimates, on the basis of the frequency characteristics, a vulnerable frequency band in which the EUT (2) is vulnerable to external signals such as interference waves.

Description

周波数帯域推定装置、周波数帯域推定方法、ＥＭＳ試験方法、及び、周波数帯域推定プログラムFrequency band estimation device, frequency band estimation method, EMS test method, and frequency band estimation program
　本発明は、周波数帯域推定装置、周波数帯域推定方法、ＥＭＳ試験方法、及び、周波数帯域推定プログラムに関する。 The present invention relates to a frequency band estimation device, a frequency band estimation method, an EMS test method, and a frequency band estimation program.
　地上では様々な妨害波が存在し、これらの妨害波が電子機器などに侵入すると機器が誤動作する、いわゆるＥＭＣ（Electromagnetic Compatibility）故障が発生する可能性がある。ＥＭＣ故障の発生を抑制し、機器の動作信頼性を向上させるため、ＥＭＣに関する様々な規格が整備され、規格に基づいて電磁妨害波に対する耐力試験、評価を実施し、一定の基準をクリアすることが必要になる。 Various types of interference waves exist on the ground, and when these interference waves enter electronic equipment, there is a possibility that the equipment will malfunction, causing a so-called EMC (Electromagnetic Compatibility) failure. In order to suppress the occurrence of EMC failures and improve the operational reliability of equipment, various standards regarding EMC have been established, and based on the standards, resistance tests and evaluations against electromagnetic interference waves must be conducted to clear certain standards. is required.
　ＥＭＣの試験規格として、非特許文献１に開示されている伝導イミュニティ試験（以下「ＥＭＳ（Electromagnetic Susceptibility）試験」という）が知られている。更に、CISPR、ITU勧告などの国際規格、及び、VCCI、TTCなどの国内規格が知られている。 A conducted immunity test (hereinafter referred to as "EMS (Electromagnetic Susceptibility) test") disclosed in Non-Patent Document 1 is known as an EMC test standard. Furthermore, international standards such as CISPR and ITU recommendations, and domestic standards such as VCCI and TTC are known.
　上述した非特許文献１に開示されたＥＭＳ試験を実施する際には、規格に適した専用の試験設備を利用し、且つ、試験対象機器に対して妨害波を模擬した試験信号を一定の周波数帯域においてスイープして印加する必要がある。このため、ＥＭＳ試験に長時間を要するという問題がある。 When conducting the EMS test disclosed in the above-mentioned Non-Patent Document 1, a dedicated test equipment suitable for the standard is used, and a test signal simulating interference waves is transmitted to the equipment under test at a certain frequency. It is necessary to sweep the signal across the band. Therefore, there is a problem that the EMS test requires a long time.
　本発明は、上記事情に鑑みてなされたものであり、その目的とするところは、測定対象機器のＥＭＳ試験を実施する際に、必要とする周波数帯域を推定し、ＥＭＳ試験を短縮化することが可能な周波数帯域推定装置、周波数帯域推定方法、ＥＭＳ試験方法、及び、周波数帯域推定プログラムを提供することにある。 The present invention has been made in view of the above circumstances, and its purpose is to estimate the required frequency band and shorten the EMS test when conducting an EMS test of a device to be measured. An object of the present invention is to provide a frequency band estimating device, a frequency band estimating method, an EMS test method, and a frequency band estimating program that can perform the following.
　本発明の一態様の周波数帯域推定装置は、測定用信号を所定の周波数帯域でスイープさせて試験対象機器に供給し、前記測定用信号に対する前記試験対象機器の周波数特性を測定する測定器と、前記周波数特性に基づいて、前記試験対象機器が外部信号に対して脆弱な脆弱周波数帯域を推定する演算装置とを備える。 A frequency band estimating device according to one aspect of the present invention includes a measuring device that sweeps a measurement signal in a predetermined frequency band and supplies it to a device under test, and measures the frequency characteristics of the device under test with respect to the measurement signal; and a calculation device that estimates a vulnerable frequency band in which the device under test is vulnerable to external signals based on the frequency characteristics.
　本発明の一態様の周波数帯域推定方法は、測定用信号を所定の周波数帯域でスイープさせて試験対象機器に供給し、前記測定用信号に対する前記試験対象機器の周波数特性を測定するステップと、前記周波数特性に基づいて、前記試験対象機器が外部信号に対して脆弱な脆弱周波数帯域を推定するステップとを備える。 A frequency band estimation method according to one aspect of the present invention includes the steps of: sweeping a measurement signal in a predetermined frequency band and supplying the same to a device under test; and measuring the frequency characteristics of the device under test with respect to the measurement signal; and estimating a vulnerable frequency band in which the device under test is vulnerable to external signals based on frequency characteristics.
　本発明の一態様のＥＭＳ試験方法は、測定用信号を所定の周波数帯域でスイープさせて試験対象機器に供給し、前記測定用信号に対する前記試験対象機器の周波数特性を測定するステップと、前記周波数特性に基づいて、前記試験対象機器が外部信号に対して脆弱な脆弱周波数帯域を推定するステップと、ＥＭＳ試験装置により、前記試験対象機器に対して前記脆弱周波数帯域に対してのみＥＭＳ試験を実施するステップとを備える。 An EMS test method according to one aspect of the present invention includes the steps of: sweeping a measurement signal in a predetermined frequency band and supplying it to a device under test; measuring the frequency characteristics of the device under test with respect to the measurement signal; estimating a vulnerable frequency band in which the device under test is vulnerable to external signals based on characteristics; and performing an EMS test on the device under test only in the vulnerable frequency band using an EMS test device. and a step of doing so.
　本発明の一態様は、上記周波数帯域推定装置としてコンピュータを機能させるための周波数帯域推定プログラムである。 One aspect of the present invention is a frequency band estimating program for causing a computer to function as the frequency band estimating device.
　本発明によれば、測定対象機器のＥＭＳ試験を実施する際に、必要とする周波数帯域を推定することができ、ＥＭＳ試験に要する時間を短縮化することが可能になる。 According to the present invention, when performing an EMS test on a device to be measured, it is possible to estimate the required frequency band, and it is possible to shorten the time required for the EMS test.
図１は、実施形態に係る周波数帯域推定装置の構成を示すブロック図である。FIG. 1 is a block diagram showing the configuration of a frequency band estimating device according to an embodiment. 図２は、ＥＭＳ試験装置の構成を示すブロック図である。FIG. 2 is a block diagram showing the configuration of the EMS test device. 図３は、ＥＵＴのエミッションレベル、及びインピーダンスの周波数特性を示すグラフである。FIG. 3 is a graph showing the emission level and impedance frequency characteristics of the EUT. 図４は、エミッションレベルとインピーダンスとの乗算値の周波数特性を示すグラフである。FIG. 4 is a graph showing the frequency characteristics of the product of emission level and impedance. 図５は、本実施形態のハードウェア構成を示すブロック図である。FIG. 5 is a block diagram showing the hardware configuration of this embodiment.
［実施形態の説明］
　以下、実施形態について図面を参照して説明する。図１は、実施形態に係る周波数帯域推定装置１の構成を示すブロック図である。図２は、ＥＭＳ試験を実施するＥＭＳ試験装置１００の構成を示すブロック図である。 [Description of embodiment]
Hereinafter, embodiments will be described with reference to the drawings. FIG. 1 is a block diagram showing the configuration of a frequency band estimating device 1 according to an embodiment. FIG. 2 is a block diagram showing the configuration of an EMS test device 100 that performs an EMS test.
　初めに、図２を参照してＥＭＳ試験装置１００の構成について説明する。ＥＭＳ試験装置１００は、妨害波などの外部信号に対する試験を実施する試験対象機器２（以下、「ＥＵＴ２（Equipment Under Test）」という）に設けられる２つの測定点２１、２２にプローブ３１、３２接続してＥＵＴ２のＥＭＳ試験を実施する。測定点２１、２２は、ＥＵＴ２に設けられた通信信号の入出力ポイント、制御信号の入出力ポイント、電力の入出力ポイントとしてもよい。 First, the configuration of the EMS test device 100 will be described with reference to FIG. 2. The EMS test device 100 connects probes 31 and 32 to two measurement points 21 and 22 provided on the equipment under test 2 (hereinafter referred to as "EUT 2 (Equipment Under Test)") that tests external signals such as interference waves. EMS test of EUT2 will be carried out. The measurement points 21 and 22 may be input/output points for communication signals, input/output points for control signals, or input/output points for electric power provided in the EUT 2.
　ＥＭＳ試験は、ＥＵＴ２に想定される電磁環境における耐性を評価することを目的としている。ＥＭＳ試験装置１００は、所定の帯域で周波数をスイープさせて妨害波を模擬した試験信号をＥＵＴ２の各測定点２１、２２に供給し、ＥＵＴ２の動作を確認する。 The purpose of the EMS test is to evaluate the immunity of EUT2 in the expected electromagnetic environment. The EMS test device 100 supplies a test signal simulating an interference wave by sweeping the frequency in a predetermined band to each measurement point 21, 22 of the EUT 2, and confirms the operation of the EUT 2.
　ＥＭＳ試験装置１００は、結合/減結合回路網４Ａ、４Ｂ（以下、「ＣＤＮ４Ａ、４Ｂ（Coupling Decoupling Network）」という）と、補助機器５Ａ、５Ｂと、増幅器６と、終端抵抗器７と、試験信号発生器８を備えている。 The EMS test device 100 includes coupling/ decoupling circuit networks 4A, 4B (hereinafter referred to as " CDN 4A, 4B (Coupling Decoupling Network)"), auxiliary equipment 5A, 5B, an amplifier 6, a terminating resistor 7, and a test A signal generator 8 is provided.
　ＣＤＮ４Ａは、測定点２１と補助機器５Ａの間に設けられ、ＥＵＴ２に対してＲＦ信号などの試験信号を供給し、ＥＵＴ２で発生した信号を測定する。ＣＤＮ４Ａは、補助機器５Ａへの信号の流入を防ぐ役割を有する。 The CDN 4A is provided between the measurement point 21 and the auxiliary equipment 5A, supplies a test signal such as an RF signal to the EUT 2, and measures the signal generated by the EUT 2. The CDN 4A has the role of preventing signals from flowing into the auxiliary device 5A.
　ＣＤＮ４Ｂは、測定点２２と補助機器５Ｂの間に設けられ、ＥＵＴ２に対してＲＦ信号などの試験信号を供給し、ＥＵＴ２で発生した信号を測定する。ＣＤＮ４Ｂは、補助機器５Ｂへの信号の流入を防ぐ役割を有する。 The CDN 4B is provided between the measurement point 22 and the auxiliary equipment 5B, supplies a test signal such as an RF signal to the EUT 2, and measures the signal generated by the EUT 2. The CDN 4B has the role of preventing signals from flowing into the auxiliary device 5B.
　試験信号発生器８は、妨害波を模擬した試験信号を発生して増幅器６に出力する。試験信号発生器８は、試験信号の周波数を一定の周波数の範囲でスイープして出力する。 The test signal generator 8 generates a test signal simulating an interference wave and outputs it to the amplifier 6. The test signal generator 8 sweeps the frequency of the test signal within a certain frequency range and outputs the same.
　増幅器６は、試験信号発生器８から出力される試験信号を増幅してＣＤＮ４Ｂに出力する。 The amplifier 6 amplifies the test signal output from the test signal generator 8 and outputs it to the CDN 4B.
　終端抵抗器７は、ＣＤＮ４Ａとグランドとの間に設置される抵抗器である。 The terminating resistor 7 is a resistor installed between the CDN 4A and the ground.
　次に、図１を参照して実施形態に係る周波数帯域推定装置１について説明する。周波数帯域推定装置１は、測定器１１と、演算装置１２を備えている。 Next, a frequency band estimating device 1 according to an embodiment will be described with reference to FIG. 1. The frequency band estimating device 1 includes a measuring device 11 and an arithmetic device 12.
　測定器１１は、ＥＵＴ２の測定点２１、２２に対して、測定用信号を所定の周波数帯域でスイープさせて供給し、ＥＵＴ２の周波数特性を測定する。測定用信号の周波数がＥＵＴ２で使用されるクロック信号、同期信号、スイッチング信号、パイロット信号などの各種の信号の周波数に近づく或いは一致すると、ＥＵＴ２の測定点２１、２２から出力されるエミッションレベルが高まる。「エミッションレベル」とは、入力信号に対する出力信号のレベルである。また、測定点２１、２２間のインピーダンスが低下する。 The measuring device 11 sweeps and supplies a measurement signal in a predetermined frequency band to the measurement points 21 and 22 of the EUT 2, and measures the frequency characteristics of the EUT 2. When the frequency of the measurement signal approaches or matches the frequency of various signals such as clock signals, synchronization signals, switching signals, and pilot signals used in the EUT 2, the emission level output from the measurement points 21 and 22 of the EUT 2 increases. . "Emission level" is the level of an output signal relative to an input signal. Furthermore, the impedance between the measurement points 21 and 22 is reduced.
　測定器１１は、スイープさせて供給した測定用信号に対してＥＵＴ２にから放出されるエミッションレベルの周波数特性を測定する。測定器１１は、２つの測定点２１、２２間のインピーダンスの周波数特性を測定する。 The measuring device 11 measures the frequency characteristics of the emission level emitted from the EUT 2 with respect to the measurement signal supplied in a swept manner. The measuring device 11 measures the frequency characteristics of impedance between two measurement points 21 and 22.
　測定器１１は、後述する第１変形例、第２変形例で示すように、ＥＵＴ２のエミッションレベル及びインピーダンスのうちのいずれか一方の周波数特性を測定してもよい。 The measuring device 11 may measure the frequency characteristics of either the emission level or the impedance of the EUT 2, as shown in a first modification example and a second modification example described later.
　測定器１１として、例えばインピーダンスアナライザ、ネットワークアナライザ、スペクトラムアナライザを使用することができる。 As the measuring device 11, for example, an impedance analyzer, a network analyzer, or a spectrum analyzer can be used.
　インピーダンスアナライザは、ＥＵＴ２の測定点２１、２２に測定用の信号を周波数を変化させながら供給する。インピーダンスアナライザは、ＥＵＴ２に印加される電圧、電流、位相を測定して周波数変化に対するインピーダンス特性を測定する。即ち、インピーダンスアナライザを用いることによりＥＵＴ２のインピーダンス特性を測定することができる。 The impedance analyzer supplies measurement signals to the measurement points 21 and 22 of the EUT 2 while changing the frequency. The impedance analyzer measures the voltage, current, and phase applied to the EUT 2 to measure impedance characteristics with respect to frequency changes. That is, by using an impedance analyzer, the impedance characteristics of the EUT 2 can be measured.
　ネットワークアナライザは、ＥＵＴ２の測定点に測定用の信号を、周波数を変化させながら供給し、測定点における通過電力、及び反射電力を測定する。 The network analyzer supplies a measurement signal to the measurement point of the EUT 2 while changing the frequency, and measures the passing power and reflected power at the measurement point.
　スペクトラムアナライザは、ＥＵＴ２の測定点２１、２２に測定用の信号を、周波数を変化させながら供給し、ＥＵＴ２の電力を測定する。スペクトラムアナライザは、横軸を周波数、縦軸を電力または電圧とする二次元のグラフを画面に表示する。即ち、ネットワークアナライザ、或いはスペクトラムアナライザによりＥＵＴ２のエミッションレベルを測定することができる。 The spectrum analyzer supplies measurement signals to the measurement points 21 and 22 of the EUT 2 while changing the frequency, and measures the power of the EUT 2. A spectrum analyzer displays a two-dimensional graph on the screen with frequency on the horizontal axis and power or voltage on the vertical axis. That is, the emission level of the EUT 2 can be measured using a network analyzer or a spectrum analyzer.
　図１に戻って、演算装置１２は、入力部１２１と、乗算部１２２と、推定部１２３を備えている。 Returning to FIG. 1, the arithmetic device 12 includes an input section 121, a multiplication section 122, and an estimation section 123.
　入力部１２１は、測定器１１で測定されたエミッションレベルの絶対値｜Ｖｅ｜、及びインピーダンスの絶対値｜Ｚｃ｜を取得する。 The input unit 121 obtains the absolute value of the emission level |Ve| and the absolute value of the impedance |Zc| measured by the measuring device 11.
　乗算部１２２は、エミッションレベルの絶対値｜Ｖｅ｜とインピーダンスの絶対値｜Ｚｃ｜とを乗算し、乗算値Ｘ１（＝｜Ｖｅ｜*｜Ｚｃ｜）を算出する。 The multiplier 122 multiplies the absolute value of the emission level |Ve| by the absolute value of the impedance |Zc| to calculate a multiplication value X1 (=|Ve|*|Zc|).
　推定部１２３は、乗算値Ｘ１と所定の第１の閾値Ｔｈ１を比較し、乗算値Ｘ１が第１の閾値Ｔｈ１を上回る（Ｘ１＞Ｔｈ１となる）周波数帯域Ｆｘ（後述する図４参照）を取得する。推定部１２３は、この周波数帯域Ｆｘを、ＥＵＴ２が妨害波などの外部信号に対して脆弱な脆弱周波数帯域Ｆｘとして推定する。脆弱周波数帯域Ｆｘは、ＥＵＴ２が外部信号により影響を受けて誤動作を発生し易い周波数帯域を意味する。推定部１２３は、推定した脆弱周波数帯域Ｆｘを後段の機器に出力する。 The estimation unit 123 compares the multiplication value X1 with a predetermined first threshold Th1, and obtains a frequency band Fx (see FIG. 4 described later) in which the multiplication value X1 exceeds the first threshold Th1 (X1>Th1). do. The estimation unit 123 estimates this frequency band Fx as a vulnerable frequency band Fx in which the EUT 2 is vulnerable to external signals such as interference waves. The vulnerable frequency band Fx means a frequency band in which the EUT 2 is easily affected by external signals and malfunctions. The estimation unit 123 outputs the estimated vulnerable frequency band Fx to a subsequent device.
　推定部１２３で推定された脆弱周波数帯域Ｆｘは、例えばディスプレイ（図示省略）に表示される。ユーザは、ディスプレイを見ることにより、ＥＵＴ２の脆弱周波数帯域Ｆｘを認識することができる。 The vulnerable frequency band Fx estimated by the estimation unit 123 is displayed, for example, on a display (not shown). The user can recognize the vulnerable frequency band Fx of the EUT 2 by looking at the display.
　次に、本実施形態に係る周波数帯域推定装置１の動作について説明する。図１に示す測定器１１から、測定用信号を一定の周波数帯域でスイープさせてＥＵＴ２の測定点２１、２２に供給すると、測定器１１においてエミッションレベルＶｅの周波数特性、及びインピーダンスＺｃの周波数特性が得られる。 Next, the operation of the frequency band estimating device 1 according to this embodiment will be explained. When a measurement signal is swept in a certain frequency band from the measuring instrument 11 shown in FIG. can get.
　図３は、ＥＵＴ２のエミッションレベルＶｅ及びインピーダンスＺｃの周波数特性の一例を示すグラフである。図３に示す曲線Ｐ１はエミッションレベルＶｅの周波数特性を示し、曲線Ｐ２はインピーダンスＺｃの周波数特性を示している。 FIG. 3 is a graph showing an example of the frequency characteristics of the emission level Ve and impedance Zc of the EUT 2. A curve P1 shown in FIG. 3 shows the frequency characteristics of the emission level Ve, and a curve P2 shows the frequency characteristics of the impedance Zc.
　曲線Ｐ１に示すようにエミッションレベルＶｅは、周波数ｆ１～ｆ２の帯域で上昇しており、閾値Ｔｈ２（後述する第２の閾値）を上回っている。曲線Ｐ２に示すように、インピーダンスＺｃは周波数ｆ３～ｆ４の帯域で低下しており、閾値Ｔｈ３（後述する第３の閾値）を下回っている。即ち、ＥＵＴ２はこの周波数ｆ１～ｆ２、ｆ３～ｆ４の帯域の周波数を有する妨害波に脆弱であることが分かる。 As shown in the curve P1, the emission level Ve is increasing in the frequency band f1 to f2, and exceeds the threshold Th2 (second threshold described later). As shown by the curve P2, the impedance Zc decreases in the frequency band f3 to f4, and is below a threshold Th3 (a third threshold to be described later). That is, it can be seen that the EUT 2 is vulnerable to interference waves having frequencies in the frequency bands f1 to f2 and f3 to f4.
　乗算部１２２は、エミッションレベルＶｅとインピーダンスＺｃを取得し、それぞれの絶対値｜Ｖｅ｜及び｜Ｚｃ｜を乗算する。推定部１２３は、乗算値Ｘ１（｜Ｖｅ｜*｜Ｚｃ｜）を取得する。図４は、乗算値Ｘ１の周波数特性を示すグラフである。図４に示す曲線Ｐ３は、乗算値Ｘ１（｜Ｖｅ｜*｜Ｚｃ｜）を示している。 The multiplier 122 obtains the emission level Ve and the impedance Zc, and multiplies them by their respective absolute values |Ve| and |Zc|. The estimation unit 123 obtains the multiplication value X1 (|Ve|*|Zc|). FIG. 4 is a graph showing the frequency characteristics of the multiplication value X1. A curve P3 shown in FIG. 4 indicates the multiplication value X1 (|Ve|*|Zc|).
　推定部１２３は、曲線Ｐ３に示す乗算値Ｘ１が所定の第１の閾値Ｔｈ１を上回る周波数帯域を、ＥＵＴ２が外部信号に対して脆弱な脆弱周波数帯域であると推定する。推定部１２３は、推定した脆弱周波数帯域の情報を外部に出力する。脆弱周波数帯域の情報は、例えばディスプレイに表示されてユーザに通知される。 The estimation unit 123 estimates that the frequency band in which the multiplication value X1 shown in the curve P3 exceeds the predetermined first threshold Th1 is a vulnerable frequency band in which the EUT 2 is vulnerable to external signals. The estimation unit 123 outputs the estimated vulnerable frequency band information to the outside. Information on vulnerable frequency bands is displayed on a display and notified to the user, for example.
　即ち演算装置１２は、周波数特性に基づいて、ＥＵＴ２（試験対象機器）が妨害波などの外部信号に対して脆弱な脆弱周波数帯域を推定する。演算装置１２は、エミッションレベルの絶対値｜Ｖｅ｜とインピーダンスの絶対値｜Ｚｃ｜とを乗算した乗算値「｜Ｖｅ｜*｜Ｚｃ｜」が、所定の第１の閾値Ｔｈ１を上回る周波数帯域を、脆弱周波数帯域として推定する。 That is, the calculation device 12 estimates the vulnerable frequency band in which the EUT 2 (device under test) is vulnerable to external signals such as interference waves, based on the frequency characteristics. The arithmetic device 12 determines a frequency band in which a multiplication value "|Ve|*|Zc|" obtained by multiplying the absolute value of the emission level |Ve| by the absolute value of the impedance |Zc| exceeds a predetermined first threshold Th1. , estimated as a vulnerable frequency band.
　ユーザは、図２に示したＥＭＳ試験装置１００でＥＭＳ試験を実施する際に、試験信号発生器８が出力する試験信号の周波数を上記の処理で推定された脆弱周波数帯域に設定する。 When carrying out an EMS test with the EMS test apparatus 100 shown in FIG. 2, the user sets the frequency of the test signal output by the test signal generator 8 to the vulnerable frequency band estimated by the above processing.
　ＥＭＳ試験装置１００でＥＭＳ試験を実施する際には、試験信号発生器８は、上記の処理で推定された脆弱周波数帯域においてＥＭＳ試験を実施すればよい。 When carrying out an EMS test with the EMS test device 100, the test signal generator 8 may carry out the EMS test in the vulnerable frequency band estimated by the above processing.
　このように、本実施形態に係る周波数帯域推定装置１は、測定用信号を所定の周波数帯域でスイープさせて試験対象機器（ＥＵＴ２）に供給し、測定用信号に対するＥＵＴ２の周波数特性を測定する測定器１１と、周波数特性に基づいて、ＥＵＴ２が外部信号に対して脆弱な脆弱周波数帯域を推定する演算装置１２と、を備える。 As described above, the frequency band estimating device 1 according to the present embodiment sweeps a measurement signal in a predetermined frequency band and supplies it to the equipment under test (EUT 2), and performs a measurement to measure the frequency characteristics of the EUT 2 with respect to the measurement signal. and an arithmetic device 12 that estimates a vulnerable frequency band in which the EUT 2 is vulnerable to external signals based on frequency characteristics.
　本実施形態では、ＥＭＳ試験装置１００でＥＭＳ試験を実施する際に、試験信号発生器８は、試験対象とする周波数帯域全体に亘って周波数をスイープさせる必要はなく、上記の処理で推定された脆弱周波数帯域においてＥＭＳ試験を実施すればよい。このため、ＥＭＳ試験に要する時間を短縮化することが可能になる。 In this embodiment, when carrying out an EMS test with the EMS test device 100, the test signal generator 8 does not need to sweep the frequency over the entire frequency band to be tested; EMS tests can be conducted in vulnerable frequency bands. Therefore, it becomes possible to shorten the time required for the EMS test.
　本実施形態では、測定器１１は、ＥＵＴ２に設けられる通信信号の入出力ポイント、制御信号の入出力ポイント、及び電力の入出力ポイントのうちの少なくとも一つに測定用信号を供給している。従って、測定器１１をＥＵＴ２に対して容易に接続することができ、且つ、エミッションレベルＶｅ、及びインピーダンスＺｃを高精度に測定することができる。 In the present embodiment, the measuring device 11 supplies a measurement signal to at least one of a communication signal input/output point, a control signal input/output point, and a power input/output point provided in the EUT 2. Therefore, the measuring device 11 can be easily connected to the EUT 2, and the emission level Ve and impedance Zc can be measured with high precision.
［第１変形例の説明］
　次に、本実施形態の第１変形例について説明する。前述した実施形態では、ＥＵＴ２に測定用信号を供給したときのエミッションレベルＶｅ、及びインピーダンスＺｃの周波数特性を取得し、これらの絶対値を乗算した乗算値Ｘ１に基づいて脆弱周波数帯域を推定した。第１変形例では、エミッションレベルＶｅが所定の第２の閾値Ｔｈ２を上回る周波数帯域を検出し、この周波数帯域を脆弱周波数帯域として推定する。 [Description of the first modification]
Next, a first modification of this embodiment will be described. In the embodiment described above, the frequency characteristics of the emission level Ve and impedance Zc when the measurement signal is supplied to the EUT 2 are obtained, and the vulnerable frequency band is estimated based on the multiplication value X1 obtained by multiplying these absolute values. In the first modification, a frequency band in which the emission level Ve exceeds a predetermined second threshold Th2 is detected, and this frequency band is estimated as a vulnerable frequency band.
　具体的に、図３の曲線Ｐ１において、周波数ｆ１～ｆ２の帯域の一部においてエミッションレベルＶｅが第２の閾値Ｔｈ２を上回っている。従って、この帯域を脆弱周波数帯域として推定する。 Specifically, in the curve P1 of FIG. 3, the emission level Ve exceeds the second threshold Th2 in a part of the frequency band f1 to f2. Therefore, this band is estimated to be a vulnerable frequency band.
　即ち、第１変形例では、測定器１１は、ＥＵＴ２から出力されるエミッションレベルＶｅの周波数特性を測定し、演算装置１２は、エミッションレベルＶｅが第２の閾値Ｔｈ２を上回る周波数帯域を、脆弱周波数帯域として推定する。 That is, in the first modification, the measuring device 11 measures the frequency characteristics of the emission level Ve output from the EUT 2, and the arithmetic device 12 defines the frequency band in which the emission level Ve exceeds the second threshold Th2 as a vulnerable frequency. Estimate as band.
　第１変形例では、ＥＵＴ２で測定されるエミッションレベルＶｅに基づいて脆弱周波数帯域を推定するので、簡易な測定で脆弱周波数帯域を推定することができる。また、前述した実施形態と同様に、ＥＭＳ試験を実施する際の周波数帯域を脆弱周波数帯域に限定して試験を実施できるので、ＥＭＳ試験に要する時間を短縮化することができる。 In the first modification, the vulnerable frequency band is estimated based on the emission level Ve measured by the EUT 2, so the vulnerable frequency band can be estimated by simple measurement. Furthermore, as in the embodiment described above, the frequency band for conducting the EMS test can be limited to the vulnerable frequency band, so the time required for the EMS test can be shortened.
［第２変形例の説明］
　次に、本実施形態の第２変形例について説明する。第２変形例では、インピーダンスＺｃが所定の第３の閾値Ｔｈ３を下回る周波数帯域を検出し、この周波数帯域を脆弱周波数帯域として推定する。 [Description of second modification]
Next, a second modification of this embodiment will be described. In the second modification, a frequency band in which the impedance Zc is lower than a predetermined third threshold Th3 is detected, and this frequency band is estimated as a vulnerable frequency band.
　具体的に、図３の曲線Ｐ２において、周波数ｆ３～ｆ４の帯域においてインピーダンスＺｃが所定の第３の閾値Ｔｈ３を下回っている。従って、この帯域を脆弱周波数帯域として推定する。 Specifically, in the curve P2 of FIG. 3, the impedance Zc is below the predetermined third threshold Th3 in the frequency band f3 to f4. Therefore, this band is estimated to be a vulnerable frequency band.
　即ち、第２変形例では、測定器１１は、測定点２１、２２間のインピーダンスＺｃの周波数特性を測定し、演算装置１２は、インピーダンスＺｃが第３の閾値Ｔｈ３を下回る周波数帯域を、脆弱周波数帯域として推定する。 That is, in the second modification, the measuring device 11 measures the frequency characteristic of the impedance Zc between the measuring points 21 and 22, and the arithmetic device 12 defines the frequency band in which the impedance Zc is below the third threshold Th3 as a vulnerable frequency. Estimate as band.
　第２変形例では、ＥＵＴ２で測定されるインピーダンスＺｃに基づいて脆弱周波数帯域を推定するので、簡易な測定で脆弱周波数帯域を推定することができる。また、前述した実施形態と同様に、ＥＭＳ試験を実施する際の周波数帯域を脆弱周波数帯域に限定して試験を実施できるので、ＥＭＳ試験に要する時間を短縮化することができる。 In the second modification, the vulnerable frequency band is estimated based on the impedance Zc measured by the EUT 2, so the vulnerable frequency band can be estimated by simple measurement. Furthermore, as in the embodiments described above, the frequency band for conducting the EMS test can be limited to the vulnerable frequency band, so the time required for the EMS test can be shortened.
　上記説明した本実施形態の周波数帯域推定装置１に搭載される演算装置１２には、図５に示すように例えば、ＣＰＵ（Central Processing Unit、プロセッサ）９０１と、メモリ９０２と、ストレージ９０３（HDD：HardDisk Drive、SSD：SolidState Drive）と、通信装置９０４と、入力装置９０５と、出力装置９０６とを備える汎用的なコンピュータシステムを用いることができる。メモリ９０２およびストレージ９０３は、記憶装置である。このコンピュータシステムにおいて、ＣＰＵ９０１がメモリ９０２上にロードされた所定のプログラムを実行することにより、演算装置１２の各機能が実現される。 As shown in FIG. 5, the arithmetic device 12 installed in the frequency band estimating device 1 of the present embodiment described above includes, for example, a CPU (Central Processing Unit, processor) 901, a memory 902, and a storage 903 (HDD: A general-purpose computer system including a HardDisk Drive (SSD: Solid State Drive), a communication device 904, an input device 905, and an output device 906 can be used. Memory 902 and storage 903 are storage devices. In this computer system, each function of the arithmetic unit 12 is realized by the CPU 901 executing a predetermined program loaded onto the memory 902.
　なお、演算装置１２は、１つのコンピュータで実装されてもよく、あるいは複数のコンピュータで実装されても良い。また、演算装置１２は、コンピュータに実装される仮想マシンであっても良い。 Note that the arithmetic device 12 may be implemented by one computer or by multiple computers. Further, the arithmetic device 12 may be a virtual machine implemented in a computer.
　なお、演算装置１２用のプログラムは、ＨＤＤ、ＳＳＤ、ＵＳＢ（Universal Serial Bus）メモリ、ＣＤ (Compact Disc)、ＤＶＤ (Digital Versatile Disc)などのコンピュータ読取り可能な記録媒体に記憶することも、ネットワークを介して配信することもできる。 Note that the program for the arithmetic unit 12 may be stored in a computer-readable recording medium such as an HDD, SSD, USB (Universal Serial Bus) memory, CD (Compact Disc), or DVD (Digital Versatile Disc), or it may be stored on a network. It can also be distributed via.
　なお、本発明は上記実施形態に限定されるものではなく、その要旨の範囲内で数々の変形が可能である。 Note that the present invention is not limited to the above-described embodiments, and many modifications can be made within the scope of the invention.
　１　周波数帯域推定装置
　２　ＥＵＴ（試験対象機器）
　４Ａ、４Ｂ　ＣＤＮ（結合/減結合回路網）
　５Ａ、５Ｂ　補助機器
　６　増幅器
　７　終端抵抗器
　８　試験信号発生器
　１１　測定器
　１２　演算装置
　２１、２２　測定点
　３１、３２　プローブ
　１２１　入力部
　１２２　乗算部
　１２３　推定部
　１００　ＥＭＳ試験装置 1 Frequency band estimation device 2 EUT (device under test)
4A, 4B CDN (coupling/decoupling network)
5A, 5B Auxiliary equipment 6 Amplifier 7 Termination resistor 8 Test signal generator 11 Measuring device 12 Arithmetic device 21, 22 Measurement points 31, 32 Probe 121 Input section 122 Multiplying section 123 Estimating section 100 EMS test equipment

Claims (8)

  1. 　測定用信号を所定の周波数帯域でスイープさせて試験対象機器に供給し、前記測定用信号に対する前記試験対象機器の周波数特性を測定する測定器と、
    　前記周波数特性に基づいて、前記試験対象機器が外部信号に対して脆弱な脆弱周波数帯域を推定する演算装置と、
    　を備えた周波数帯域推定装置。     a measuring device that sweeps a measurement signal in a predetermined frequency band and supplies it to the device under test, and measures the frequency characteristics of the device under test with respect to the measurement signal;
    a calculation device that estimates a vulnerable frequency band in which the device under test is vulnerable to external signals based on the frequency characteristics;
    A frequency band estimator equipped with
  2. 　前記測定器は、前記試験対象機器に設けられる通信信号の入出力ポイント、制御信号の入出力ポイント、及び電力の入出力ポイントのうちの少なくとも一つに前記測定用信号を供給する
    　請求項１に記載の周波数帯域推定装置。     The measuring device supplies the measurement signal to at least one of a communication signal input/output point, a control signal input/output point, and a power input/output point provided in the device under test. The frequency band estimation device described.
  3. 　前記測定器は、前記試験対象機器から出力されるエミッションレベルの周波数特性、及び前記試験対象機器のインピーダンスの周波数特性を測定し、
    　前記演算装置は、前記エミッションレベルの絶対値と前記インピーダンスの絶対値との乗算値が第１の閾値を上回る周波数帯域を、前記脆弱周波数帯域として推定する
    　請求項１または２に記載の周波数帯域推定装置。     The measuring device measures the frequency characteristics of the emission level output from the device under test and the frequency characteristics of the impedance of the device under test,
    The frequency band estimation according to claim 1 or 2, wherein the arithmetic device estimates a frequency band in which a multiplication value of the absolute value of the emission level and the absolute value of the impedance exceeds a first threshold value as the vulnerable frequency band. Device.
  4. 　前記測定器は、前記試験対象機器から出力されるエミッションレベルの周波数特性を測定し、
    　前記演算装置は、前記エミッションレベルが第２の閾値を上回る周波数帯域を、前記脆弱周波数帯域として推定する
    　請求項１または２に記載の周波数帯域推定装置。     The measuring device measures the frequency characteristics of the emission level output from the device under test,
    The frequency band estimating device according to claim 1 or 2, wherein the arithmetic device estimates a frequency band in which the emission level exceeds a second threshold value as the vulnerable frequency band.
  5. 　前記測定器は、前記試験対象機器のインピーダンスの周波数特性を測定し、
    　前記演算装置は、前記インピーダンスが第３の閾値を下回る周波数帯域を、前記脆弱周波数帯域として推定する
    　請求項１または２に記載の周波数帯域推定装置。     The measuring device measures frequency characteristics of impedance of the device under test,
    The frequency band estimating device according to claim 1 or 2, wherein the arithmetic device estimates a frequency band in which the impedance is lower than a third threshold value as the vulnerable frequency band.
  6. 　測定用信号を所定の周波数帯域でスイープさせて試験対象機器に供給し、前記測定用信号に対する前記試験対象機器の周波数特性を測定するステップと、
    　前記周波数特性に基づいて、前記試験対象機器が外部信号に対して脆弱な脆弱周波数帯域を推定するステップと、
    　を備えた周波数帯域推定方法。     Sweeping the measurement signal in a predetermined frequency band and supplying it to the device under test, and measuring the frequency characteristics of the device under test with respect to the measurement signal;
    estimating a vulnerable frequency band in which the device under test is vulnerable to external signals based on the frequency characteristics;
    A frequency band estimation method with
  7. 　測定用信号を所定の周波数帯域でスイープさせて試験対象機器に供給し、前記測定用信号に対する前記試験対象機器の周波数特性を測定するステップと、
    　前記周波数特性に基づいて、前記試験対象機器が外部信号に対して脆弱な脆弱周波数帯域を推定するステップと、
    　ＥＭＳ試験装置により、前記試験対象機器に対して前記脆弱周波数帯域に対してのみＥＭＳ試験を実施するステップと、
    　を備えたＥＭＳ試験方法。     Sweeping the measurement signal in a predetermined frequency band and supplying it to the device under test, and measuring the frequency characteristics of the device under test with respect to the measurement signal;
    estimating a vulnerable frequency band in which the device under test is vulnerable to external signals based on the frequency characteristics;
    performing an EMS test on the test target device only for the vulnerable frequency band using an EMS test device;
    EMS test method with
  8. 　請求項１または２に記載の周波数帯域推定装置としてコンピュータを機能させる周波数帯域推定プログラム。 A frequency band estimating program that causes a computer to function as the frequency band estimating device according to claim 1 or 2.
PCT/JP2022/020490 2022-05-17 2022-05-17 Frequency band estimation device, frequency band estimation method, ems testing method, and frequency band estimation program WO2023223414A1 (en)

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Publication number Priority date Publication date Assignee Title
JP2000304794A (en) * 1999-04-22 2000-11-02 Ntt Advanced Technology Corp Conduction immunity testing device
JP2015001517A (en) * 2013-07-02 2015-01-05 ローム株式会社 Method for evaluating electric circuit
JP2020030073A (en) * 2018-08-21 2020-02-27 地方独立行政法人東京都立産業技術研究センター Electronic product evaluation method and evaluation device
JP7053969B1 (en) * 2021-05-21 2022-04-12 三菱電機株式会社 IC noise tolerance detection device, IC noise tolerance detection method, and IC internal impedance measurement method

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000304794A (en) * 1999-04-22 2000-11-02 Ntt Advanced Technology Corp Conduction immunity testing device
JP2015001517A (en) * 2013-07-02 2015-01-05 ローム株式会社 Method for evaluating electric circuit
JP2020030073A (en) * 2018-08-21 2020-02-27 地方独立行政法人東京都立産業技術研究センター Electronic product evaluation method and evaluation device
JP7053969B1 (en) * 2021-05-21 2022-04-12 三菱電機株式会社 IC noise tolerance detection device, IC noise tolerance detection method, and IC internal impedance measurement method

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