JP2003279612A - Evaluation system for radioactive noise immunity - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make a watching person efficiently and accurately monitor the operation of an EUT (equipment under test) without entering a radio wave dark room. <P>SOLUTION: A machine under test 11 receiving an electromagnetic wave noise inside the radio wave dark room 12 is provided with a memory 14 stored with an expectation data indicating a prescribed operation of the machine under test 11 when not receiving an electromagnetic wave, a comparator 15 for comparing a measured data for indicating an operation condition output from the machine 11 under the condition where the electromagnetic wave noise is received inside the dark room 12 with the expectation data stored in the memory 14, and a display means 16 for displaying an output result from the comparator 15. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radiated noise immunity evaluation system suitable for use in a resistance test of electronic devices such as LSI and memory against disturbance factors such as electromagnetic noise.

[0002]

2. Description of the Related Art For radiated noise immunity evaluation of electronic equipment, for example, in order to prevent the influence of electromagnetic wave noise to the outside and to measure the characteristics with high accuracy, for example, Japanese Patent No.
An anechoic chamber whose wall surface is surrounded by an electromagnetic wave absorber is used as described in Japanese Patent Laid-Open Publication No. 2004-242242. According to the prior art described in this publication, a device under test (Equipment under Test, hereinafter referred to simply as an EUT) arranged in the anechoic chamber is used.
Called. ) Is radiated with electromagnetic wave noise, and whether or not the EUT malfunctions under this disturbance factor is monitored by a monitor outside the anechoic chamber through a monitor. By monitoring outside the anechoic chamber through this monitor screen, the influence of electromagnetic waves on the human body can be prevented and the malfunction of the EUT can be monitored.

Further, in Japanese Laid-Open Patent Publication No. 11-72523, an expected value pattern that will be obtained when an input pattern for operation confirmation is input to the EUT and the EUT from the EUT under the influence of electromagnetic waves in a anechoic chamber. A noise immunity evaluation method for confirming the operation of the EUT is shown by comparing the obtained output pattern.

[0004]

However, in the prior art described in the above patent publication, it may be difficult to judge whether the operation is a malfunction from the apparent operation of the EUT displayed on the monitor screen. . In that case, the observer should enter the anechoic chamber affected by electromagnetic waves and
It is necessary to directly monitor the operation of T.

Further, in the prior art described in the above publication, a memory for storing an expected value pattern, the expected value pattern stored in this memory is read out, and the expected value pattern and the anechoic chamber are arranged. A comparator for comparing both output patterns from the EUT is arranged outside the anechoic chamber, and the wiring of the comparator and the EUT becomes a problem. Further, in making an accurate evaluation, it is desirable to place the data wiring for sending the expected value pattern from the memory to the comparator and the data wiring for sending the output pattern to the comparator in the same noise radio wave environment.

Therefore, an object of the present invention is to provide a radiated noise immunity evaluation system which enables an observer to accurately evaluate the EUT without entering the anechoic chamber and to efficiently monitor the operation thereof. is there.

[0007]

According to a first aspect of the present invention, the radiation noise of the EUT is tested by testing whether or not an EUT (device under test) that receives electromagnetic noise in the anechoic chamber malfunctions. A system for evaluating immunity, wherein the EUT stores a memory storing data indicating a predetermined operation of the EUT when the electromagnetic wave is not received, and a condition where the electromagnetic wave is received in the anechoic chamber. A comparator for comparing data indicating the operating state of the EUT output from the EUT with the data stored in the memory; and a display unit for displaying an output result of the comparator. To do.

According to a second aspect of the present invention, in the radiated noise immunity evaluation system according to the first aspect, the both data to be compared are data indicating a consumption current value of the EUT.

According to a third aspect of the present invention, in the radiated noise immunity evaluation system according to the first aspect, the both data to be compared are data indicating fluctuations in consumption current of the EUT. To do.

According to a fourth aspect of the present invention, in the radiated noise immunity evaluation system according to the first aspect, the EUT is a video recording electronic device, and the data stored in the memory is video data. Characterize.

According to a fifth aspect of the present invention, there is provided a system for evaluating the radiated noise immunity of the device under test by testing whether the device under test receiving electromagnetic wave noise in the anechoic chamber malfunctions. A data processing device that is arranged outside the anechoic chamber and can perform wired communication with the device under test, the data processing device having a memory that holds evaluation test data in advance, While transmitting the evaluation test data to the device under test under the electromagnetic noise in the room, receiving the return of the evaluation test data received by the device under test from the device under test, the evaluation test returned Data is compared with the evaluation test data in the memory, and the comparison result is displayed.

According to a sixth aspect of the present invention, in the radiated noise immunity evaluation system according to any one of the first to fifth aspects, when the two data are inconsistent, the inconsistency is notified by sound. It is characterized in that it is provided with an alarm means.

According to the radiated noise immunity evaluation system of the first aspect, the comparison result between the data in the memory incorporated in the EUT and the data output from the EUT is displayed by the display means. By monitoring the display on the monitor, it is possible to accurately and easily determine whether or not the EUT has malfunctioned without the observer entering the anechoic chamber. Further, the memory and the comparator are placed in the same noise environment as the EUT. Therefore, both data to be compared, which are supplied to the comparator, are supplied to the comparator through the same noise environment, and therefore the difference in distortion due to the difference in noise condition is not added to the comparison result of the comparator. As a result, an accurate comparison result can be obtained from the comparator 15.

Therefore, the EU displayed on the monitor screen
Even if it is difficult to judge whether the operation is a malfunction or not from the appearance operation of T, by monitoring the display of the display means with a monitor, the observer enters the anechoic chamber and operates the EUT. It is not necessary to reconfirm, and it is possible to accurately and efficiently monitor whether or not the EUT has malfunctioned without causing an error during monitoring.

According to the radiated noise immunity evaluation system of the second aspect, it is determined whether or not the operation of the EUT is a malfunction, based on the current consumption value of the EUT. Malfunctions can be easily monitored.

According to the radiated noise immunity evaluation system of the third aspect, whether or not the operation of the EUT is a malfunction is determined by the fluctuation value of the consumption current of the EUT. As the data value, the difference due to the fluctuation of the current consumption can be adopted, which makes it possible to reduce the amount of data stored in the memory and the memory capacity.

According to the radiated noise immunity evaluation system of the fourth aspect, whether or not the EUT operation is a malfunction is determined by comparing the video data itself, so that even continuous video images are captured. When a problem occurs in the data, the abnormality can be displayed accurately at that point. From this, it is possible to accurately and promptly recognize an abnormality that cannot be accurately grasped by the visual observation of the image without depending on the visual observation of the image by the observer.

According to the radiated noise immunity evaluation system of claim 5, data is transmitted and received between the data processing device and the EUT under the environment of electromagnetic noise, and the data used for the transmission and reception and the data stored in advance are stored. Since the result of comparison with the data is displayed by the display means, it is possible to easily determine whether or not the EUT has malfunctioned without the supervisor entering the anechoic chamber.

Therefore, the EU displayed on the monitor screen
Even if it is difficult to judge whether the operation of T is a malfunction or not from the appearance operation of T, by monitoring the display of the display means, the monitor enters the anechoic chamber and restarts the operation of the EUT. It is not necessary to check, and it is possible to efficiently monitor whether or not the EUT has malfunctioned without causing an error during monitoring. In addition, since the data transmitted and received under the electromagnetic noise environment is used as a comparison target, it is possible to obtain a highly reliable immunity evaluation.

According to the radiated noise immunity evaluation system of the sixth aspect, when the operation of the EUT is stopped or malfunctions due to the influence of electromagnetic waves, the EUT is caused by a sound.
Since the malfunction of the EUT can be detected, the malfunction of the EUT can be monitored without fail.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below with reference to the illustrated embodiments.

SPECIFIC EXAMPLE 1 FIG. 1 is a sectional view schematically showing a radiated noise immunity evaluation system 10 according to the present invention.

Radiated Noise Immunity Evaluation System 1
0 is an EU under test such as an electronic circuit element such as an LSI or a memory, an electronic circuit component or an electronic circuit device.
An anechoic chamber 12 containing T11 is provided. Anechoic chamber 12
Has its wall surface covered with an electromagnetic wave absorber to prevent the intrusion of electromagnetic waves from the outside into the anechoic chamber 12, and
The leakage of electromagnetic wave noise from the antenna 13 arranged in the inside 2 is prevented. Although not shown in the anechoic chamber 12, if necessary, the operation of the EUT 11 is performed.
A monitor camera of a conventionally well-known monitor device for making it visible outside is arranged, and an image taken by the monitor camera can be observed by a monitor image receiving device arranged outside the anechoic chamber 12.

The EUT 11, which is subjected to the radiated noise immunity evaluation in the anechoic chamber 12, has a memory 14 for storing the data for the evaluation test, and the output data of the EUT 11 showing the data stored in the memory and the operating state of the EUT 11. And a display means 16 for displaying the output result of the comparator 15.

The memory 14 stores in advance output data (expected data) indicating a normal operating state when the EUT 11 is operated in a state where electromagnetic noise is not received. The comparator 15 outputs output data (measurement data) indicating an operating state when the EUT 11 is operated under electromagnetic noise from the antenna 13 and expectation data corresponding to the measurement data out of expected value data stored in the memory 14. The data is compared and the comparison result is output to the display means 16.

The display means 16 is, for example, a comparator 15.
When the two data to be compared do not match, the display unit is constituted by a light emitting diode such as a light emitting diode for displaying the mismatch by light emission based on the output from the comparator 15. The display means 16 can be configured by a display device that displays the coincidence and non-coincidence of both data by characters or symbols.

Radiated noise immunity evaluation system 1
The operation procedure of 0 will be described with reference to FIG. When the EUT 11 starts a predetermined operation in a state where electromagnetic noise is emitted from the antenna 13 toward the EUT 11 arranged in the anechoic chamber 12, the EUT 11 sequentially outputs measured data indicating the operation under test to the comparator 15. It is output (step S1). Simultaneously with the input of the measurement data, expected data corresponding to the measurement data is sequentially input to the comparator 15 (step S2), and the result of the comparison between the corresponding two data (step S3) indicates that both data match and both. The data does not match and is output to the display means 16 (steps S4 and S5).

The display means 16 is placed in, for example, a non-operation state (step S6) when it receives a normal signal indicating the coincidence of both data from the comparator 15. This display means 16
The non-operation state of means that the EUT 11 does not malfunction due to electromagnetic noise. On the other hand, the display means 16
When receiving an abnormal signal indicating the disagreement of both data, is put into an operating state (step S7) and emits light. By observing this light emission with a monitor device outside the anechoic chamber 12, for example, it is possible to know that the abnormal operation has occurred in the EUT 11.

FIG. 3 shows an example of an operation pattern when the EUT 11 is not receiving electromagnetic noise. As operation patterns, operation A (step Sa) and operation B (step S)
b), operation C (step Sc) ... operation X (step S)
x) is repeated. It is shown that the expected data changes to A, B, C ... X according to this operation pattern.

Even when the EUT 11 receives electromagnetic wave noise, the operation pattern shows the same operation pattern change (operation A, operation B, operation C ... Operation X) as shown in FIG. 3, as shown in FIG. As a result, as long as the measured data changes in accordance with the expected data (A, B, C ... X), the comparator 15 does not output an abnormal signal indicating a mismatch, and the display means 16 operates. There is no such thing.

However, as shown in FIG. 5, for example, the EUT
In a state where 11 receives the electromagnetic noise, after the operation A (step Sa), the operation B (step Sb) and the operation D (step Sd) different from the operation C, the operation output from the EUT 11 to the comparator 15 is output. The measurement data indicating the state changes from the measurement data B indicating the operation state B to the measurement data D indicating the operation D. At this time, the comparator 15
Expected data C following expected data B and measured data D
, And an abnormal signal is output to the display means 16, and the display means 16 displays the abnormal operation of the EUT 11.

Further, as shown in FIG. 6, after the EUT 11 performs the operation A (step Sa) and the operation B (step Sb) and then stops the operation (step Sstop), the comparator 15 causes the comparator 15 to move from the EUT 11 to the comparator 15. Since the inconsistency is detected between the measurement data STOP output to the device and the expected data C, the display means 16 immediately displays the EUT 11
The abnormal operation of is displayed.

Since the observer can easily see the display operation of the display means 16 by the monitor device outside the anechoic chamber 12, the abnormal operation of the EUT 11 can be promptly confirmed without entering the anechoic chamber 12. can do.

Further, a comparator 15 for comparing data
Are provided in the EUT 11, and the measurement data from the EUT 11 and the expected data from the memory 14 output to the comparator 15 are supplied to the comparator 15 under the same noise condition in the anechoic chamber 12. If the two data supply paths are under different noise conditions, it is difficult to obtain an accurate comparison result due to the noise difference. However, in the radiated noise immunity evaluation system 10, the measured data and the expected data are stored in the comparator 1 under the same noise condition.
Since it is supplied to No. 5, it is possible to highly accurately determine whether or not both data match each other, which enables highly accurate immunity evaluation.

FIG. 7 shows an example in which the current consumption value in each operation of the EUT 11 is used as a comparison target. The memory 14 stores in advance output data (expected data) indicating the current consumption in each normal operating state when the EUT 11 is operated in the state of not receiving electromagnetic noise. Also,
The EUT 11 outputs to the comparator 15 output data (measurement data) indicating the current consumption value in each operating state when the EUT 11 is operated under the electromagnetic noise from the antenna 13.

When the EUT 11 starts a predetermined operation in a state where the electromagnetic noise is emitted from the antenna 13 toward the EUT 11 arranged in the anechoic chamber 12, the EUT 11 is started.
From the measurement data indicating the current consumption value in the relevant operation during the test is sequentially output to the comparator 15 (step S1).
1). Simultaneously with the input of the measurement data, expected data corresponding to the measurement data is sequentially input to the comparator 15 (step S12), and the result of the comparison between the corresponding data (step S13) indicates that both data match and both. The data does not match and is output to the display means 16 (steps S14 and S15).

When the display means 16 receives a normal signal indicating the coincidence of both data from the comparator 15, it is placed in a non-operation state (step S16). The non-operating state of the display means 16 means that the EUT 11 is not malfunctioning due to electromagnetic noise. On the other hand, the display means 16
When receiving the abnormal signal indicating the disagreement between the two data, it is placed in an operating state (step S17) and emits light. By observing this light emission with a monitor device outside the anechoic chamber 12, for example, it is possible to know that the abnormal operation has occurred in the EUT 11.

FIG. 8 shows an example of an operation pattern when the EUT 11 is not receiving electromagnetic noise. As operation patterns, operation A (step Sa) and operation B (step S)
b), operation C (step Sc) ... operation X (step S)
x) is repeated. It is shown that the expected data indicating the current consumption value changes to a, b, c ... X according to this operation pattern.

Even when the EUT 11 receives electromagnetic noise, as shown in FIG. 9, the operation pattern shows the same operation pattern change (operation A, operation B, operation C ... Operation X) as shown in FIG. As a result, the consumption current value, which is the measurement data, changes in accordance with the expected data (a, b, c ... x).
As long as this is done, the comparator 15 will not output an abnormal signal indicating a mismatch to the display means 16, and the display means 16
Will never work.

However, for example, as shown in FIG.
In a state where T11 receives electromagnetic noise, after operation A (step Sa), operation B (step Sb), and operation C (step Sc), measurement data c ′ different from expected data c is obtained.
And outputs the expected data c,
A discrepancy is detected between the measurement data c'and the display means 16
An abnormal signal is output to the display means 16 and the display means 16 displays the abnormal operation of the EUT 11.

Further, as shown in FIG. 11, when the EUT 11 performs the operation A (step Sa) and the operation B (step Sb) and then stops the operation (step Sstop), the comparator 15 causes the comparator 15 to operate. Since the inconsistency is detected between the input measurement data 0 and the expected data C, the display unit 16 immediately displays the abnormal operation of the EUT 11.

By detecting an abnormality by comparing current consumption values in each operation of the EUT 11, it is possible to easily monitor the operation stop and malfunction of the EUT 11.

FIG. 12 shows an example in which the change value of the current consumption during each operation of the EUT 11 is used as a comparison target. Memory 1
4 is EUT11 without receiving electromagnetic noise.
Output data (expected data) indicating the amount of change in current consumption between the normal operating states when is operated is stored in advance. Further, the EUT 11 outputs output data (measurement data) indicating the change value of the consumption current between the respective operating states when the EUT 11 is operated under the electromagnetic noise from the antenna 13 to the comparator 15.

When the EUT 11 starts a predetermined operation in a state where electromagnetic noise is emitted from the antenna 13 toward the EUT 11 arranged in the anechoic chamber 12, the EUT 1
From 1 onward, every time the operating state is switched during the test, the measurement data indicating the change value of the current consumption between both operating states is sequentially output to the comparator 15 (step S21). Simultaneously with the input of the measurement data, expected data corresponding to the measurement data is sequentially input to the comparator 15 (step S
22), the result of the comparison between the two corresponding data (step S23) is output to the display means 16 as a match of both data and a mismatch of both data (step S24, step S25).

When the display means 16 receives a normal signal indicating the coincidence of both data from the comparator 15, it is placed in the non-operation state (step S26). The non-operating state of the display means 16 means that the EUT 11 is not malfunctioning due to electromagnetic noise. On the other hand, the display means 16
When receiving the abnormal signal indicating the disagreement of both data, it is put into an operating state (step S27) and emits light. By observing this light emission with a monitor device outside the anechoic chamber 12, for example, it is possible to know that the abnormal operation has occurred in the EUT 11.

FIG. 13 shows an example of an operation pattern when the EUT 11 is not receiving electromagnetic noise. As the operation pattern, operation A (step Sa) to operation B (step Sb), operation C (step Sc) ... operation X (step Sx) are repeated. In accordance with this operation pattern, in step So as an initial value, expected data a indicating the current consumption value in operation A is shown.
From operation B to operation B ... from operation B to operation A ... At each transition of the operation from operation X to operation A (steps Sb, Sc ... Sa), the amount of change in the consumed current value changes to Δa, Δb ... Δx. Has been done.

Even when the EUT 11 receives electromagnetic wave noise, the operation pattern is as shown in FIG. 13 as shown in FIG.
The same operation pattern changes (operation A, operation B,
The operation C ... operation X) is shown, whereby the consumption current change value, which is the measurement data, changes in accordance with the expected data (Δa, Δ).
b ... Δx)
No abnormal signal indicating a mismatch with 6 is output, and the display means 16 does not operate.

However, for example, as shown in FIG.
When T11 receives the electromagnetic noise, after the operation B (step Sb) and the operation C (step Sc), the measurement data Δb ′ different from the expected data Δb is output, and the comparator 15 outputs the expected data Δb. A discrepancy with the measured data Δb ′ is detected, an abnormal signal is output to the display means 16, and the display means 16 displays the abnormal operation of the EUT 11.

Further, as shown in FIG. 16, when the EUT 11 repeats a series of operations (operation A, operation B ... Operation X) and shifts to operation B by some number of repeated operations (step Sb), the operation is performed. Is stopped (step Sstop), the consumption current becomes zero from the consumption current value b of the operation B, so that the measured data, which is the change value of the consumption current, becomes the consumption current value b. At this time, the comparator 15 is
Since the mismatch between the measured data b input to 5 and the expected data Δb is detected, the display means 16 immediately displays E.
Displays abnormal operation of UT11.

By detecting an abnormality by comparing the change values of the consumption current when the EUT 11 changes in operation, the memory 14 may store the differential data at each change in operation except for the initial value. Therefore, the capacity of the memory 14 can be reduced as compared with the example in which the abnormality is detected by comparing the consumption currents.

In FIG. 17, the EUT 11 is composed of a video recording electronic device such as a video device, and EUT is used as a comparison target.
An example using the video data of UT11 is shown. The memory 14 stores, as expected data, video data, that is, video recording data, which is captured in a state where it is not subjected to electromagnetic noise. Further, the video data output from the EUT 11 when the EUT 11 is operated under the electromagnetic noise from the antenna 13 is used as measurement data by the comparator 1
5 is output.

When the EUT 11 starts reproducing the recording while the electromagnetic noise is emitted from the antenna 13 toward the EUT 11 arranged in the anechoic chamber 12, the EUT 11 is started.
The video data (measurement data) being reproduced is sequentially output to the comparator 15 (step S31). The recording data (expected data) corresponding to the measurement data is sequentially input to the comparator 15 simultaneously with the input of the measurement data (step S32), and the result of the comparison between the corresponding two data (step S33) is the same. It is output to the display unit 16 that the data matches and the data does not match (steps S34 and S35).

When the display means 16 receives the normal signal indicating the coincidence of both data from the comparator 15, the display means 16 is placed in the non-operation state (step S36). The non-operating state of the display means 16 means that the EUT 11 is not malfunctioning due to electromagnetic noise. On the other hand, the display means 16
When the abnormal signal indicating the disagreement of both data is received, it is put into an operating state (step S37) and emits light. An abnormal operation of the EUT 11 can be known by observing this light emission with a monitor device outside the anechoic chamber 12, for example.

In addition, the playback screen of the EUT 11 is operated by the monitor device without being monitored by the monitor device.
Since it is possible to monitor the operation of the display means 16 that can easily identify the non-operating state, even if the abnormal operation is difficult to be clearly and accurately determined by the monitor observation of the reproduction screen of the EUT 11, the display means 16 can clearly indicate the abnormal operation. Since the abnormal operation can be displayed, by monitoring the display means 16,
It is possible to know accurately and easily that an abnormal operation has occurred in the EUT 11.

<Specific Example 2> FIG. 18 is a sectional view schematically showing another radiated noise immunity evaluation system 110 according to the present invention.

Radiated Noise Immunity Evaluation System 1
10 includes an anechoic chamber 12 similar to that in the evaluation system 10 shown in FIG. In the anechoic chamber 12, an antenna 13 that radiates electromagnetic noise to the EUT 111, which is the device under test, is provided.

EUT111 arranged in anechoic chamber 12
Is provided with a communication unit 18 for enabling wired communication with an information processing device 17 such as a personal computer (hereinafter, simply referred to as a PC) arranged outside the anechoic chamber 12. ing.

The communication section 18 of the EUT 111 is connected to the PC 17.
For example, a communication unit 20 capable of communicating via a USB standard cable 19 is provided. Further, the PC 17 is provided with a memory 14, a comparator 15, and a display means 16.

The memory 14 of the PC 17 stores a series of communication test data for evaluating the radiated noise immunity as expected values. The test data in the memory 14 can be sequentially transmitted from the communication unit 20 via the cable 19 to the EUT 111 receiving electromagnetic noise in the anechoic chamber 12. Each time the EUT 111 receives test data from the PC 17, this data is returned to the PC 17 via the cable 19 as return data. PC17 is EUT
Every time the output data from the 111 is received by the communication unit 20 as return data (measurement data), the returned measurement value data is compared with the corresponding expected value data in the memory 14, and the comparison result is obtained. Is output to the display means 16.

The display means 16 displays the non-coincidence on the display screen based on the output from the comparator 15 when, for example, the two data to be compared by the comparator 15 do not coincide with each other, as described in the concrete example 1. . Display means 1
As 6, a warning device such as a buzzer that emits a warning sound can be used.

Radiated Noise Immunity Evaluation System 1
The operation procedure of 10 will be described with reference to FIG. A series of communication test data is stored in the memory 14 of the PC 17 (step S101). The EUT 11 is placed inside the anechoic chamber 12 and is located outside the anechoic chamber 12 via the cable 19.
When connected to C17, EUT111 in anechoic chamber 12
Electromagnetic noise is emitted from the antenna 13 toward the.
Under the irradiation of this electromagnetic noise, the PC 17 to the EUT 11
1, the data A is transmitted from the series of data in the memory 14, and the EUT 111 receives this as the data B (step S). When the EUT 111 receives the data B, the received data B is returned to the PC 17, and the PC 17 receives the returned data B as the data C (step S1).
03).

When the PC 17 receives the data C, the data C is stored in the measured value register which is one register of the comparator 15, and the expected value register which is the other register is stored in the memory 14 corresponding to the data C. Data A
Is stored. As a result, the comparator 15 compares the values in the two registers (step S104).

The comparator 15 outputs the result of comparison between the measurement data C and the expected data A corresponding to the measurement data to the display means 16 as a match of both data and a mismatch of both data (step S105, step S).
106).

When the display means 16 receives the normal signal indicating the coincidence of both data from the comparator 15, the display means 16 is placed in the non-operation state (step S108). The non-operating state of the display means 16 means that the EUT 11 is not malfunctioning due to electromagnetic noise. In this case, in the series of the data in the memory 14, the comparator 15 is used for new communication test data following the data A.
The data in both of the registers are deleted (step S10
9), the above steps are sequentially repeated for the new communication test data.

On the other hand, when the display means 16 receives the abnormal signal indicating the disagreement of both data, it performs an abnormal display operation (step S107). When the display means 16 is an alarm means,
The alarm means notifies the monitor of the occurrence of the abnormal operation by a warning sound such as a buzzer sound. Further, when the display means 16 is a light emitting means such as a light emitting diode, the light emitting diode displays the occurrence of an abnormal operation to the monitor by the light emission. When the display means 16 has a display screen, a warning mark or a warning sentence can be displayed on the display screen to notify an observer of the occurrence of abnormal operation.

In the radiated noise immunity evaluation system 110 according to the present invention, the EUT under the condition that the measurement data to be compared with the expected data is subject to electromagnetic noise.
Since it is obtained through communication with 111, the immunity evaluation with excellent reliability can be performed.

Further, by incorporating the alarm means and notifying the occurrence of the abnormal operation by the alarm sound, the occurrence of the abnormal operation of the EUT 111 can be more surely known without oversight, and the reliability of the immunity evaluation can be improved. it can.

The radiant noise immunity evaluation system 10 of the specific example 1 is an alarm means for issuing an alarm such as a buzzer sound.
Can be incorporated into.

[0069]

According to the invention described in claim 1, even when it is difficult to judge whether or not the operation is a malfunction from the apparent operation of the EUT displayed on the monitor screen,
By monitoring the display of the display means with a monitor, it is not necessary for the observer to enter the anechoic chamber and reconfirm the operation of the EUT, and it is possible to monitor whether or not the EUT malfunctions without causing an error during monitoring. Can be done efficiently. Further, since the EUT and the comparator are placed in the same noise environment, these wirings are placed in the same noise environment, which enables accurate evaluation and simplifies the routing of the wiring between them. be able to.

According to the second aspect of the present invention, since it is determined whether or not the operation of the EUT is an erroneous operation based on the current consumption value of the EUT, it is easy to stop the operation and the erroneous operation of the EUT. Can be monitored.

According to the third aspect of the present invention, whether or not the operation of the EUT is a malfunction is determined by the fluctuation value of the consumption current of the EUT. Therefore, the data value of the operating state of the EUT is consumed. The difference due to the fluctuation of the current can be adopted, which makes it possible to reduce the amount of data stored in the memory and the memory capacity.

According to the fourth aspect of the present invention, whether or not the EUT operation is an erroneous operation is determined by comparing the video data itself, so that there is an abnormality that cannot be accurately grasped by visual inspection of the video. , You can know accurately and quickly.

According to the fifth aspect of the present invention, even if it is difficult to judge whether or not the operation of the EUT is an erroneous operation based on the apparent operation of the EUT displayed on the monitor screen, By monitoring the display, it is not necessary for the observer to enter the anechoic chamber and reconfirm the operation of the EUT. Efficiently monitor whether the EUT has malfunctioned without causing mistakes during monitoring. You can Further, since the data transmitted and received under the electromagnetic wave environment is used as the comparison target, it is possible to obtain the highly reliable immunity evaluation.

According to the sixth aspect of the present invention, when the EUT operation is stopped or malfunctions due to the influence of electromagnetic waves, the malfunction of the EUT can be detected by the sound. Therefore, the malfunction of the EUT can be overlooked. The operation can be monitored without fail.

[Brief description of drawings]

FIG. 1 is a sectional view schematically showing a specific example of a radiated noise immunity evaluation system according to the present invention.

FIG. 2 is an explanatory diagram showing an evaluation procedure of the radiated noise immunity evaluation system shown in FIG.

FIG. 3 is an explanatory diagram showing a data example (1) of an operating state in which the electromagnetic wave of the EUT in the evaluation procedure shown in FIG. 2 is not received.

4 is an explanatory diagram showing a data example (2) of an operating state under irradiation of electromagnetic waves of the EUT in the evaluation procedure shown in FIG.

5 is an explanatory diagram showing a data example (3) of another operation state under irradiation of electromagnetic waves of the EUT in the evaluation procedure shown in FIG.

6 is an explanatory diagram showing a data example (4) of still another operation state under irradiation of electromagnetic waves of the EUT in the evaluation procedure shown in FIG.

FIG. 7 is an explanatory diagram showing another evaluation procedure of the radiated noise immunity evaluation system shown in FIG. 1.

8 is an explanatory diagram showing a data example (1) of an operating state in which the electromagnetic wave of the EUT in the evaluation procedure shown in FIG. 7 is not received.

9 is an explanatory diagram showing a data example (2) of an operating state under irradiation of electromagnetic waves of the EUT in the evaluation procedure shown in FIG. 7.

10 is an explanatory diagram showing a data example (3) of another operation state under irradiation of electromagnetic waves of the EUT in the evaluation procedure shown in FIG. 7.

11 is a schematic diagram of E of the EUT shown in FIG. 1 under irradiation of electromagnetic waves.
It is explanatory drawing which shows the data example (3) of another operation state of UT.

FIG. 12 is an explanatory diagram showing still another evaluation procedure of the radiated noise immunity evaluation system shown in FIG. 1.

13 is an explanatory diagram showing a data example (1) of an operating state in which the electromagnetic wave of the EUT is not received in the evaluation procedure shown in FIG.

14 is an explanatory diagram showing a data example (2) of an operating state under irradiation of electromagnetic waves of the EUT in the evaluation procedure shown in FIG.

15 is an explanatory diagram showing a data example (3) of another operation state under irradiation of electromagnetic waves of the EUT in the evaluation procedure shown in FIG.

16 is an explanatory diagram showing a data example (4) of still another operation state under irradiation of electromagnetic waves of the EUT in the evaluation procedure shown in FIG.

17 is an explanatory diagram showing still another evaluation procedure of the radiated noise immunity evaluation system shown in FIG. 1. FIG.

FIG. 18 is a cross-sectional view schematically showing another specific example of the radiated noise immunity evaluation system according to the present invention.

19 is an explanatory diagram showing an evaluation procedure of the radiated noise immunity evaluation system shown in FIG. 18. FIG.

[Explanation of symbols]

10,110 Radiated noise immunity evaluation system 11, 111 (machine under test) EUT 12 Anechoic chamber 14 memory 15 Comparator 16 Display means

Claims (6)

[Claims] 1. A system for evaluating the radiated noise immunity of a device under test by testing whether or not the device under test receiving electromagnetic noise in the anechoic chamber malfunctions. Is a memory storing data indicating a predetermined operation of the device under test when not receiving an electromagnetic wave,
A comparator for comparing the data stored in the memory with the data indicating the operating state of the device under test output from the device under test under the condition of receiving electromagnetic waves in the anechoic chamber; A radiated noise immunity evaluation system, comprising: display means for displaying an output result. 2. The radiated noise immunity evaluation system according to claim 1, wherein the both data to be compared are data indicating a current consumption value of the device under test. 3. The radiated noise immunity evaluation system according to claim 1, wherein the both data to be compared are data indicating a variation in current consumption of the device under test. 4. The radiated noise immunity evaluation system according to claim 1, wherein the device under test is a video recording electronic device, and the data stored in the memory is video data. 5. A system for evaluating the radiated noise immunity of a device under test by testing whether the device under test receiving electromagnetic noise in the anechoic chamber malfunctions. The data processing device is provided and is capable of wired communication with the device under test. The data processing device has a memory that holds evaluation test data in advance and is under electromagnetic noise in the anechoic chamber. While transmitting the evaluation test data to the device under test, receiving the return of the evaluation test data received by the device under test from the device under test, the returned evaluation test data and in the memory A radiated noise immunity evaluation system characterized by comparing the evaluation test data and displaying the comparison result. 6. The radiated noise immunity evaluation system according to any one of claims 1 to 5, further comprising alarm means for notifying a sound of the disagreement when the disagreement is detected between the both data.