JPH06160447A - Electromagnetic interference wave measuring instrument - Google Patents

Abstract

PURPOSE:To measure the time waveform or frequency spectrum at another point at the same time or before or after the time waveform at a certain point is measured in an interlocking way. CONSTITUTION:The waveform of a time waveform from a time waveform input section is measured by means of a time waveform measuring section 8-i by using the case where an arbitrary time waveform exceeds a preset intensity as a trigger and, at the same time, the frequency spectrum measurement of a frequency spectrum measuring section is actuated updating of frequency spectrum measurement data is stopped in an interlocking way with the trigger. The frequency spectrum measurement data are successively stored in buffers 11-j for frequency spectrum measurement data by always updating the data. At the time of waveform measurement, measurement data obtained at the same time or before or after the waveform measurement are collected by transferring the frequency spectrum measurement data in the buffers 11-j to a waveform storing section 13 together with time waveform measurement data.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a measuring instrument for detecting an electromagnetic environment related to a time waveform and a frequency spectrum at or before and after a time waveform exceeding a preset intensity is input, and it interferes with an electronic device. The present invention relates to an electromagnetic interference wave measuring device that can be suitably used for measurement of an electromagnetic interference wave that is a cause.

[0002]

2. Description of the Related Art In recent years, electromagnetic pulses caused by lightning discharge, electrostatic discharge, TV broadcast waves, amateur radio, CB radio,
Radio waves caused by radio broadcasting and the like cause troubles such as malfunction of electronic devices. The deterioration of the electromagnetic environment caused by the increase in the number of electronic devices that cause electromagnetic interference and the deterioration of the electromagnetic environment that accompanies the increase in the speed and power consumption of semiconductor devices and the increase in the number of electronic devices that cause electromagnetic interference have spurred on these types of problems. I'm hanging. However, an electromagnetic interference wave that causes a failure of an electronic device is generated by various mechanisms, and its temporal distribution and intensity are also uncertain, and reproducibility is often poor. Further, since electromagnetic interference waves are often transient, it is difficult to identify the cause of the interference. Therefore, measuring instruments have been developed for the purpose of detecting the time waveform and frequency components of electromagnetic interference waves.

By the way, in order to investigate the cause of electromagnetic interference, a method of investigating the cause of malfunction of an electronic device by detecting the occurrence of a failure in the electronic device by a sensor and measuring the electromagnetic environment around the electronic device. Has been proposed (Japanese Patent Application No. 3)
-59889).

[0004]

However, when a failure occurs in an electronic device, only a limited number of devices have the function of notifying the occurrence of the failure, and the electromagnetic interference wave that may cause the failure is limited. In order to detect before and after the occurrence of a failure, a method of detecting an electromagnetic wave that propagates in a space having a strength or more that may cause electromagnetic interference of an electronic device, a current of a power supply line or a communication line, or an electromagnetic interference wave such as a terminal voltage in advance. Need to be established.

As a method for measuring the electromagnetic environment at the time when an electromagnetic interference wave of a level exceeding an arbitrary intensity is actually generated,
A method of combining and using a commercially available spectrum analyzer or the like can be considered. This method and its problems will be described below with reference to FIG. In FIG. 6, 1 is an antenna A,
Reference numeral 2 is a spectrum analyzer, 3 is a control device, 4 is a radar radiation antenna, 5 is antenna B, and 6 is a digital oscilloscope. Here, when a time waveform exceeding a certain level is input to the digital oscilloscope 6 when a radar whose amplitude level and temporal distribution change irregularly is radiated from the radar radiating antenna 4, in conjunction with it, Consider a situation where an electromagnetic wave propagating in space is detected by the antenna A1 and measured by the spectrum analyzer 2.

At this time, it is assumed that the digital oscilloscope 6 is set to a mode in which the updating of the waveform is temporarily stopped when the time waveform received by the antenna B5 exceeds a certain level. The control device 3 constantly monitors the state of the digital oscilloscope 6, and when a waveform is applied to the digital oscilloscope 6, the waveform is captured and the digital oscilloscope 6 receives the waveform.
Is set to output a re-measurement start command to the spectrum analyzer 2 and a measurement start command to the spectrum analyzer 2, the electromagnetic environment (time waveform and frequency) when a waveform of arbitrary intensity is radiated from the radar radiation antenna 4 is set. Spectrum) can be measured. Alternatively, the spectrum analyzer 2 is constantly in the measurement state, and the measurement data for a certain time width unit is transferred to the control device 3 every time, and the digital oscilloscope 6 is used.
It is also possible to use a method of accumulating the transferred waveform data only when the waveform is detected.

However, when the external control device 3 monitors the presence or absence of detection of the waveform of the digital oscilloscope 6, it takes at least several millimeters, and when transmitting the detected waveform, it takes several millimeters to several tens of milliseconds. Therefore, during that time, a time delay occurs in the remeasurement of the digital oscilloscope 6 and the measurement linked to the spectrum analyzer 2. Also, regarding the method of continuously transferring the waveform detected by the spectrum analyzer 2 itself to the control device 3 and accumulating the measurement data only when the waveform is detected by the digital oscilloscope 6, the transfer time of the waveform data per Since it takes several milliseconds or more, it is not efficient.

That is, when the time waveform detected at a certain observation point exceeds an arbitrary level, it is currently commercially available to measure the electromagnetic environment such as the time waveform and the frequency spectrum before and after the waveform detection time. Considering the control time and the like, it is not enough in terms of efficiency to simply combine the measuring device and the control device, and it is considered that the interlocked measurement cannot be performed sufficiently.

As described above, in the above-mentioned conventional technique and the measurement technique considered from the conventional technique, when the electromagnetic interference detected at a certain observation point exceeds an arbitrary level, before and after the detection time, To measure the time waveform and frequency spectrum, the control time of the measurement,
It was not always efficient in terms of the transfer time of measurement data, and interlocked measurement was difficult. Therefore, in conjunction with the time waveform detected at any one or more points, the time waveform,
Alternatively, it has been desired to develop a measuring instrument capable of measuring a frequency spectrum. Further, it has been desired to develop an equally efficient method for measuring the electromagnetic environment in association with the generated electromagnetic interference.

The present invention has been made to solve the above-mentioned problems, and its object is to synchronize with the time waveform detected at any one or more points, at the same time or at other points. An object is to provide an electromagnetic interference wave measuring instrument capable of measuring time waveforms and frequency spectra before and after.

[0011]

In order to achieve the above object, an electromagnetic interference wave measuring instrument of the present invention comprises at least one time waveform input section and at least one frequency spectrum input section, and A time waveform measuring unit that measures the waveform of the time waveform from the time waveform input unit by using as a trigger when any arbitrary time waveform from the waveform input unit exceeds an intensity set in advance, and the time waveform measuring unit Of the frequency spectrum measuring section for starting or stopping the frequency spectrum measurement of the input from the frequency spectrum input section in conjunction with the trigger, and the time waveform measurement data from the time waveform measuring section and the A storage unit that stores frequency spectrum measurement data from the frequency spectrum measurement unit, the time waveform measurement unit, and the frequency spectrum measurement unit. In conjunction with torque measuring unit and configured comprising a control unit for controlling.

Further, in the above configuration, the time waveform measuring unit has a buffer for temporarily storing the time waveform measurement data, and / or the frequency spectrum measuring unit has a buffer for temporarily storing the frequency spectrum measurement data. The storage data of the temporary buffer may be constantly updated, and the update may be stopped at the time of waveform measurement to transmit the storage data of the temporary storage buffer to the storage unit.

Further, the control unit controls the time waveform measuring unit by a control signal transmitted by wire or wireless using a telephone line or an optical fiber or manually, and a measurement sampling rate, a measurement voltage level, a trigger level, a frequency of the time waveform measuring unit. It is also possible to adopt a configuration having a function of setting or changing one or more of the measurement target frequency band and the measurement level of the spectrum measuring unit, and / or a function of selecting the time waveform input unit as a trigger source. .

Further, the time waveform measuring section and the frequency spectrum measuring section may be configured to start the waveform measurement and the frequency spectrum measurement by using the interference detection signal output from the external electronic device as a trigger.

[0015]

In the electromagnetic interference wave measuring device according to the present invention, the waveform measurement is performed by using as a trigger when any arbitrary time waveform exceeds the intensity set in advance, and the frequency spectrum measurement is activated in conjunction with the trigger. Or stop updating the measurement data of the frequency spectrum. The time waveform measurement data and the frequency spectrum measurement data are accumulated in the storage unit to collect necessary data. As described above, when the detected electromagnetic interference wave exceeds an arbitrary level at a certain observation point, the time waveform and the frequency spectrum at the observation point at the same time as the detection time can be measured. In addition, the waveform measurement data or the frequency spectrum measurement data is constantly updated and stored in the temporary storage buffer, and is stored in the storage unit at the time of the waveform measurement, so that the time waveform and the frequency at other observation points before and after the detection time are stored. Make the spectrum measurable.

[0016]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of the first embodiment of the electromagnetic environment measuring instrument of the present invention. In FIG.
7-i (i = 1, 2, ... N) is a time waveform input unit, 8-i
(I = 1,2, ... n, hereinafter referred to as 8 when the whole is shown)
Is a time waveform measuring unit, 9-i (i = 1, 2, ... M) is a frequency spectrum input unit, 10-i (i = 1, 2, ... A spectrum measuring section, 11-j (j = 1, 2, ... K, hereinafter referred to as 11 when the whole is shown) is a buffer for frequency spectrum measurement data provided as necessary, 12 is a control section, and 13 is a waveform memory. Reference numeral 14 is a main body portion, and 15 is a remote control portion.

First, a time waveform such as an electromagnetic wave propagating in space or a current induced in a power supply line is continuously sent from the time waveform input section 7-i to the time waveform measuring section 8. Each of the trigger levels can be set in the time waveform measuring unit 8-i, and if any one or more of the time waveforms from the time waveform input unit 7-i exceeds the set level, the trigger is simultaneously triggered. Has such a function. Here, the channel number i to be simultaneously triggered by the time waveform measuring unit 8-i can be arbitrarily selected, and the waveform sampling rate and the detection level at each position (number i) are the same or different depending on the control unit 12. The value can be changed.

When the time waveform measuring unit 8 detects a waveform, the control unit 12 outputs a measurement start command to one or more places (number i) of the frequency spectrum measuring unit 10-i. The data measured by the frequency spectrum measurement unit 10 is sent to the waveform storage unit 13 and accumulated together with the measurement data detected by the time waveform measurement unit 8. In this case, the frequency spectrum measurement data buffer 11 is not necessary. In addition, in each part (number i) of the frequency spectrum measuring unit 10-i, the control unit 12 can set and change the frequency band and the detection level to the same value or different values. Further, as shown in the figure, when the frequency spectrum measurement data buffer 11 is provided, the frequency spectrum measurement unit 10 continuously measures the measurement data of a certain time width as one unit, and then the frequency spectrum measurement data buffer 11 11-j once, and when a waveform is detected by the time waveform measuring unit 8, a buffer 11 corresponding to a signal traced back by a certain time width from the time when the waveform is detected by the time waveform measuring unit 8 -J measurement data is stored in the waveform storage unit 1
It becomes possible to set to accumulate in 3.

The remote control unit 15 uses a control signal transmitted via wire or wireless such as a telephone line and an optical fiber,
Measurement sampling rate, measurement voltage level, trigger level, and trigger channel of the time waveform measurement unit 8 (input unit 8-
i) has a function of changing the measurement target frequency band and the measurement level of the frequency spectrum measuring unit 10 through the control unit 12. It should be noted that this changing function can be manually performed.

With the above-mentioned configuration, there is an advantage that it becomes possible to automatically detect the electromagnetic environment when the level exceeds an arbitrary level in the time domain and the frequency domain at the same time without a human being nearby. Moreover, the transfer time of the measurement data in the main body portion 14 having such a configuration is several tens μ.
It is less than a second and is extremely efficient.

Next, a second embodiment of the electromagnetic environment measuring instrument of the present invention will be described. FIG. 2 is a block diagram showing the configuration. In FIG. 2, 16-i (i = 1, 2, ... K, hereinafter referred to as 16 when the whole is shown) is a time waveform buffer from the time measuring unit 8 and 17-ji (j = 1, 2, … K, i
= 1, 2, ..., M, and hereinafter referred to as 17 when the whole is shown) is a buffer for frequency spectrum measurement data. The configuration of this embodiment is different from that of the first embodiment, in that a time waveform buffer 16 is provided between the time waveform measuring unit 8 and the control unit 12, and a frequency spectrum measurement data buffer 17 is provided.
Is configured by j × i pieces, and the others are similarly configured.

In the present embodiment, when a waveform exceeding a preset level is input to a certain channel i of the time waveform measuring section 8, the update of the waveform measurement data of all channels is temporarily stopped and the waveform at that point is updated. Are temporarily transferred to the temporal waveform buffer 16. At this time, the time waveform buffer 16-
i (i = 1, 2, ... K), and then stored in the waveform storage unit 13.

When the updating of the waveform measurement data of the time waveform measuring section 8 is stopped, the frequency spectrum measuring section 10-i
A measurement start command is output from the control unit 12. The measurement data in the channel i of the frequency spectrum measuring unit 8 is
First, the buffer 1 for frequency spectrum measurement data
7-1i (i = 1, 2, ... M). When the measurement start command is continuously output to the frequency spectrum measuring unit 10, the measurement data in 17-1i is moved to 17-2i, and at the same time, new measurement data is transferred to 17-1i. Similarly, when the measurement start command is sent to the frequency spectrum measurement unit 8, the measurement data of 17-ji moves in the order of j, and the operation of transferring new measurement data to 17-1i is repeated.

Next, a case will be considered below where the waveform measurement of the frequency spectrum measuring unit 10 is set to stop when the time waveform measuring unit 8 is triggered. First, the measurement data is first transferred to the frequency spectrum measurement data buffer 17-1i with a predetermined time width. If the waveform measurement of the time waveform measurement unit 8 continues, 17-1
The content of i is transferred to 17-2i, and the new measurement data is transferred to 17-1i. Similarly, unless the time waveform measuring section 8 is triggered, a series of operations is continued,
When it reaches -ki, it will return to 17-1i again. During this period, when the update of the waveform measurement data of the time waveform measurement unit 8 is stopped, the measurement data in the frequency spectrum buffer 17-ji corresponding to the time immediately before the stop is accumulated in the waveform storage unit 13. The number of frequency spectrum buffers 17-ji accumulated when the update of the waveform measurement data of the time waveform measurement unit 8 is stopped can be set in advance.

With the above configuration, even if a waveform exceeding an arbitrary level continuously arrives, there is an advantage that the measurement can be continued by sequentially transferring the waveform to the buffer.

FIG. 3 is an explanatory diagram regarding a measuring method when the waveform measurement of the frequency spectrum measuring unit 10 is set to stop when the update of the waveform measurement data of the time waveform measuring unit 8 is stopped. In FIG. 3, the horizontal axis represents the time axis and the vertical axis represents the frequency axis.

In FIG. 3, the measuring unit 1 is operated during the time t1 to t2.
0-1 indicates the frequency range f1 to f2, the measuring unit 10-2 indicates the frequency range f2 to f3, and the measuring unit 10-i indicates the frequency range f1 to f3.
Sweep fi + 1 for a preset time (or number of times). The measurement data of each frequency region is first obtained by the frequency spectrum measurement data buffer 17-1i (i = 1,
2, ... m). Subsequently, during time t3 to t4, the measuring unit 10-1 measures the frequency ranges f1 to f2, the measuring unit 10-2 measures the frequency regions f2 to f3, and the measuring unit 10-i measures the frequency regions fi to fi + 1. And the measured data are buffer spectrum 17-1i for frequency spectrum measurement data, respectively.
(I = 1, 2, ... M). The measurement data stored in the frequency spectrum measurement data buffer 17-1i immediately before that has been moved to 17-2i.
A series of measurement operations are continued until the time waveform measuring section 8 is triggered.

By adopting the above measuring method, there is an advantage that the measurement can be continued almost continuously without interrupting the measurement of the frequency spectrum measuring section 10 until a waveform exceeding an arbitrary level is input. Occurs.

FIG. 4 is a diagram showing an application example of the present invention. In FIG. 4, 1 is an antenna A for electromagnetic environment measurement, 4 is a radar radiation antenna, 7 is an input section of the electromagnetic interference wave measuring device shown in the above embodiment, and 9-1 and 9-2 are also electromagnetic interference wave measurement. A frequency spectrum input unit of the instrument, 14 is a main body of the electromagnetic interference wave measuring instrument, 18 is an antenna C for measuring an electromagnetic environment, 19 is a communication line, and 20 is a current probe.

Here, it is assumed that the electromagnetic environment is measured when the electromagnetic interference wave propagating in the space from the radar radiation antenna 4 or the like is guided to the communication line 19. Communication line 19
When an electromagnetic interference wave exceeding a certain level is induced, it is detected by the current probe 20 and input from the time waveform input section 7, and in conjunction with this, it is detected by the antennas 1 and 18 installed at a plurality of points. Frequency spectrum input section 9-
The frequency spectrum measurement of the electromagnetic interference waves input from 1 and 9-2 is started, and the electromagnetic environment data is measured.
That is, it becomes possible to measure the electromagnetic environments in the time domain and the frequency domain at a plurality of points when the communication line 19 is guided at almost the same time.

FIG. 5 shows an embodiment of the present invention of a method for activating the time waveform measuring unit 8 and the frequency spectrum measuring unit 10 based on the fault detection signal output from the external electronic device. In FIG. 6, 1 is an antenna A for electromagnetic environment measurement, 4 is a radar radiation antenna, 14 is a main body of an electromagnetic interference wave measuring instrument, 19 is a communication line, 20 is a utility pole probe, and 21 is a function for outputting a failure detection signal. It is an electronic device having.

In FIG. 5, the electromagnetic interference wave measuring device is constructed in substantially the same manner as that shown in the above embodiment, but in this embodiment, a failure occurs in the electronic device 21 and the failure detection signal is an electromagnetic wave. When the disturbance detection signal is input to the main body portion 14 of the interfering waveform measuring instrument, the failure detection signal is the control portion 1 in FIGS.
2, the time waveform measuring unit 8 and the frequency spectrum measuring unit 10 are set to be activated. With this configuration, the electromagnetic environment such as the voltage induced in the communication line 19 and the like at the time of occurrence of the failure or before and after the occurrence of the failure in association with the occurrence of the failure and the electromagnetic field propagating in the space from the radar radiating antenna 4 etc. It becomes possible.

[0034]

As described above, according to the present invention, when a time waveform having an arbitrarily set level or higher is detected at a location, a time waveform at another location at the same time,
It is possible to measure the frequency spectrum before and after that time.

Further, according to the invention of claim 2, in particular, in the above, in addition to the measurement at the same time, the measurement data before and after the time is obtained, and the time waveform of a certain level or higher is continuously detected. Even if it does, the electromagnetic environment can be measured.

Further, according to the invention of claim 4, in particular,
In association with the failure detection signal output from an electronic device or the like, measurement data of time waveforms and frequency spectra at a plurality of points before or after the failure occurrence time can be obtained.

By measuring the electromagnetic environment at the time of detecting an electromagnetic interference wave exceeding an arbitrary level or at the time of occurrence of a failure in the electronic device, the cause of failure of the electronic device due to the electromagnetic interference wave is clarified and a countermeasure technique against the electromagnetic interference is established. The effect is very large.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a first embodiment of an electromagnetic environment measuring instrument of the present invention.

FIG. 2 is a block diagram showing the configuration of a second embodiment of the electromagnetic environment measuring instrument of the present invention.

FIG. 3 is a diagram for explaining a method of measuring a time waveform in a frequency spectrum measuring unit in the second embodiment.

FIG. 4 is a diagram showing an application example of the present invention.

FIG. 5 is a diagram showing an embodiment of the present invention of a method of activating a time waveform measuring unit and a frequency spectrum measuring unit based on a fault detection signal output from an external electronic device.

FIG. 6 is a diagram showing a configuration example in which a conventional spectrum analyzer and a control device are combined to measure an electromagnetic interference wave.

[Explanation of symbols]

1 ... Antenna A 4 ... Radar radiation antenna 5 ... Antenna B 7-i (i = 1, 2, ... N) ... Time waveform input unit 8-i (i = 1, 2, ... N) ... Time waveform measurement unit 9 -I (i = 1, 2, ... M) ... Frequency spectrum input unit 10-i (i = 1, 2, ... M) ... Frequency spectrum measurement unit 11-j (j = 1, 2, ... K) ... Frequency Spectrum measurement data buffer 12 ... Control unit 13 ... Waveform storage unit 14 ... Main body unit 15 ... Remote control unit 16-i (i = 1, 2, ... K) ... Time waveform buffer 17-ji (j = 1, 2) , ... k, i = 1,2, ... m) ...
Frequency spectrum measurement data buffer 18 ... Antenna C 19 ... Communication line 20 ... Current probe 21 ... Electronic device having a function of outputting a fault detection signal

Claims (4)

[Claims] 1. An apparatus comprising one or more time waveform input sections and one or more frequency spectrum input sections, wherein any one of the time waveforms from the time waveform input section exceeds an intensity set in advance. A time waveform measuring unit that measures the waveform of the time waveform from the time waveform input unit as a trigger, and whether to activate the frequency spectrum measurement of the input from the frequency spectrum input unit in conjunction with the trigger of the time waveform measuring unit. Alternatively, a frequency spectrum measurement unit that stops the frequency spectrum measurement, a storage unit that stores the time waveform measurement data from the time waveform measurement unit and the frequency spectrum measurement data from the frequency spectrum measurement unit, the time waveform measurement unit, and And a control unit that controls the frequency spectrum measurement unit in conjunction with each other. Measuring instrument. 2. The electromagnetic interference wave measuring device according to claim 1, wherein the time waveform measuring section has a buffer for temporarily storing the time waveform measurement data, and / or the frequency spectrum measuring section temporarily stores the frequency spectrum measurement data. Electromagnetic interference comprising a storage buffer and constantly updating the storage data of the temporary storage buffer, and stopping the update at the time of waveform measurement to send the storage data of the temporary storage buffer to a storage unit. Wave instrument. 3. The electromagnetic interference wave measuring device according to claim 1 or 2, wherein the control unit manually or manually transmits a control signal by wire or wireless using a telephone line or an optical fiber, The function of setting or changing one or more of the measurement sampling rate, the measurement voltage level, the trigger level of the time waveform measurement section, the measurement target frequency band of the frequency spectrum measurement section, and the measurement level, and / or the trigger source. An electromagnetic interference wave measuring instrument having a function of selecting a time waveform input section. 4. The electromagnetic interference wave measuring device according to claim 1 or 2, wherein the time waveform measuring unit and the frequency spectrum measuring unit measure the waveform by using an interference detection signal output from an external electronic device as a trigger. And an electromagnetic interference wave measuring instrument characterized by starting frequency spectrum measurement.