CN116500368B - System for evaluating consistency of radiation emission tests among laboratories and testing method thereof - Google Patents
System for evaluating consistency of radiation emission tests among laboratories and testing method thereof Download PDFInfo
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- G—PHYSICS
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- 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
- G01R31/001—Measuring interference from external sources to, or emission from, the device under test, e.g. EMC, EMI, EMP or ESD testing
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- 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
- G01R31/005—Testing of electric installations on transport means
- G01R31/006—Testing of electric installations on transport means on road vehicles, e.g. automobiles or trucks
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention provides a system for evaluating consistency of radiation emission tests among laboratories and a testing method thereof, comprising a composite antenna, a reference source, a radio frequency cable, a data processing system, a receiver and a wallboard connector, wherein the composite antenna, the reference source and the radio frequency cable are all positioned in a darkroom, one end of the radio frequency cable is connected with the composite antenna, the other end of the radio frequency cable passes through the darkroom inner wall to be connected with the receiver, the radio frequency cable passes through the wallboard connector to pass through the darkroom inner wall, and the receiver is in communication connection with the data processing system. The invention has the beneficial effects that: the consistency of test results among the laboratories can be improved, the test difference among the laboratories can be intuitively known, and a basis is provided for carrying out measurement tests of the laboratories.
Description
Technical Field
The invention belongs to the field of automobile electromagnetic compatibility testing, and particularly relates to a system for evaluating consistency of radiation emission tests among laboratories and a testing method thereof.
Background
With the development of vehicle dynamoelectric, intelligent and networking, the electromagnetic compatibility of vehicles is increasingly important, and the requirements of various large enterprises for electromagnetic compatibility tests are gradually increased year by year, so that a plurality of vehicle electromagnetic compatibility laboratories are newly built in China, and more than 30 families of detection mechanisms with the electromagnetic compatibility testing capability of the whole vehicle are provided. Therefore, ensuring the consistency of test structures among all detection mechanisms and laboratories is a key for scientifically developing laboratory vehicle tests. The invention mainly provides a system and a test method for evaluating the consistency of radiation emission tests among laboratories, based on the technology, the consistency of test results among the laboratories can be improved, the test difference among the laboratories can be intuitively known, and a basis is provided for developing measurement tests of the laboratories.
Disclosure of Invention
In view of the above, the present invention aims to provide a system and a testing method for evaluating the consistency of radiation emission tests among laboratories, so as to improve the stability of the tests among laboratories and the consistency of test results among laboratories, provide a reference for analyzing the difference of the results among the tests, and support the popularization and application of the existing standards in industry.
In order to achieve the above purpose, the technical scheme of the invention is realized as follows:
the system for evaluating the consistency of the radiation emission tests among the laboratories comprises a composite antenna, a reference source, a radio frequency cable, a data processing system, a receiver and a wallboard connector, wherein the composite antenna, the reference source and the radio frequency cable are all positioned in a darkroom, one end of the radio frequency cable is connected with the composite antenna, the other end of the radio frequency cable penetrates through the darkroom inner wall to be connected with the receiver, the radio frequency cable penetrates through the wallboard connector to penetrate through the darkroom inner wall, and the receiver is in communication connection with the data processing system.
Further, the reference source includes a dressing source, a dressing source antenna, and a test stand, the dressing source is mounted to the test stand, the dressing source antenna is mounted to one side of the dressing source, and the bottom of the test stand is mounted to the turntable.
Further, a test method of a system for evaluating consistency of radiation emission tests among laboratories, comprising the steps of:
s1, circulation and preparation of a reference source;
s2, detecting conditions and preparing equipment;
s3, arranging a reference source;
s4, testing;
s5, data statistics and analysis.
Further, in step S1, the circulation and preparation of the reference source includes the following steps:
s11, circulating a reference source and protecting the reference source during circulation;
s12, checking electric quantity of a reference source, and if the electric quantity is insufficient, charging the comb-shaped source charge port by connecting a power adapter to the reference source;
s13, disconnecting the comb-shaped source internal power adapter, and performing stability test on the reference source.
Further, in step S13, stability testing is performed on the reference source, including the following steps:
s131, connecting the reference source and a coaxial cable, wherein the coaxial cable is terminated with an EMI receiver;
s132, turning ON a switch ON a reference source;
s133, setting an EMI receiver as an average value detector, wherein the bandwidth is 120kHz, the stay time is 5ms, and the attenuation is 10dB;
s134, scanning under 14 characteristic frequency points in total of 32MHz, 40MHz, 55MHz, 70MHz, 90MHz, 115MHz, 150MHz, 200MHz, 270MHz, 350MHz, 460MHz, 600MHz, 750MHz and 900MHz, and recording measurement results;
s135, calculating and recording the difference between the measurement result and the appointed value, and if the difference is greater than 2dB, the reference source has stability problem and feeds back in time.
Further, in step S2, the detection conditions and equipment are prepared, including the steps of:
s21, detecting equipment requirements;
s22, detecting the environment;
s23, a test method and test conditions;
s24, maintaining and maintaining a reference source;
s25, background noise testing.
Further, in step S3, a reference source is arranged, comprising the steps of:
s31, installing a test bracket and a comb source, and installing a dressing source antenna;
s32, reference source placement orientation: when the test antenna is vertically polarized, the comb-shaped source antenna is vertically polarized, and the switch is opposite to the direction of the test antenna; when the test antenna is horizontally polarized, the dressing source is also horizontally polarized, and the switch is positioned right above, and the comb-shaped source antenna and the longitudinal axis direction of the turntable are overlapped.
Further, in step S4, the experimental test includes the following steps:
s41, firstly, reference source inspection is required to be carried out, and after the inspection result is confirmed to be in accordance with the inspection standard, testing is carried out;
s42, the turntable is in a static normal power supply state, the rotating hub is in a 40km/h running state, the shaft of the rotating hub and the transverse shaft of the turntable are respectively 1.3m, and a metal cover plate is not arranged above the rotating hub;
s43, rotating the turntable to enable the transverse axis of the turntable to coincide with the NSA test axis of the laboratory;
s44, moving the test antenna to enable the vertical distance between the phase center of the test antenna and a vertical plane passing through the positions of (1), 2 and 3 to be 10 m+/-0.2 m, and enabling the phase center to be 3 m+/-0.05 m away from the ground of the darkroom;
s45, setting a quasi-peak detector and an average detector scanning mode of the receiver;
s46, placing a reference source and a test support at a position (1);
s47, performing the test in the step S48 when the test antenna is vertically polarized and the test antenna is horizontally polarized respectively;
s48, when the comb-shaped source antenna is 12'', testing is carried out under 10 characteristic frequency points of 32, 40, 55, 70, 90, 115, 150, 200, 270 and 350MHz, specifically, in the range of +/-60 kHz of the frequency point, continuous testing is carried out by using 120kHz detector bandwidth, 20kHz step length and 1S residence time, and the maximum value in the test result is used as a measured value under the characteristic frequency point; when the comb-shaped source antenna is 5'', testing is carried out under 4 characteristic frequency points of 460, 600, 750 and 900MHz, specifically: continuously testing with 120kHz detector bandwidth and 20kHz step length and 1s residence time within the range of frequency points +/-60 kHz, wherein the maximum value in the test result is used as a measured value under the characteristic frequency point;
s49, translating the reference source and the support to a position (2) along the longitudinal axis of the turntable, and repeating the step S47 and the step S48;
s410, translating the reference source and the support to a position (3) along the longitudinal axis of the turntable, and repeating the step S47 and the step S48;
s411, translating the reference source and the support to a position (4) along the longitudinal axis of the turntable, and repeating the step S47 and the step S48;
s412, translating the reference source and the support to a position (5) along the longitudinal axis of the turntable, and repeating the step S47 and the step S48;
s413, translating the reference source and the support to a position (6) along the longitudinal axis of the turntable, and repeating the step S47 and the step S48;
s414, rotating the turntable for 180 degrees, and repeating the steps S47-S413;
s415, after the test is completed, the reference source is checked, and after the check standard is confirmed, the comb-shaped source and the antenna are detached for boxing and transportation.
Further, in step S5, the data is counted and analyzed, including the steps of:
s51, reserving the effective number of the electric field measured value to the position 2 after the decimal point in the detection result of the step S4;
s52, recording original recording parameters for verifying the detection capability; recording the observation result, data and calculation of each detection work, and storing the original record;
and S53, summarizing detection results of all laboratories, and carrying out statistical analysis.
Further, in step S53, the statistical analysis is performed on the detection results of each laboratory, including the following steps:
s531, evaluating the result by adopting the capability statistic difference value D;
the capability statistic difference D is calculated as:
；
；
wherein:detecting the difference value for the quasi peak value; />Detecting a difference value for the average value; />The final value is tested for quasi peak detection in the participation laboratory; />Detecting a test end value for the average value of the participating laboratories; />A specified value for quasi-peak detection; />A specified value detected for the average value;
s532, selecting 80% frequency points as evaluation frequency points; defining the difference E in CISPR 12 to be 5.72dB;
if the D is less than or equal to 5.72dB, the satisfactory result is obtained; otherwise, unsatisfactory results are obtained;
s533, taking the median value of the detection results of all laboratories as a designated value, and carrying out statistical technical treatment by a method of comparing the detection results of all laboratories with the designated value;
s534, when the standard deviation of all laboratory results is 1.5 times greater than the standard deviation of the appointed value, adopting a standby true value; the standby true value is the median value of the capability statistic difference value D;
s535, outputting the final test result.
Compared with the prior art, the system for evaluating the consistency of the radiation emission tests among laboratories and the testing method thereof have the following advantages:
the system for evaluating the consistency of the radiation emission tests among the laboratories and the testing method thereof can improve the consistency of the test results among the laboratories, intuitively know the test differences among the laboratories and provide a basis for developing the measurement tests of the laboratories.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:
FIG. 1 is a schematic diagram of the system components and connections according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a test arrangement according to an embodiment of the present invention;
FIG. 3 is a schematic view of the left and right sides of a turntable according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a comb-shaped source antenna according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a comb-shaped source antenna according to an embodiment of the present invention.
Reference numerals illustrate:
1. a composite antenna; 2. a reference source; 3. a data processing system; 4. a receiver; 5. wall plate connector.
Detailed Description
It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", etc. may explicitly or implicitly include one or more such feature. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art in a specific case.
The invention will be described in detail below with reference to the drawings in connection with embodiments.
As shown in fig. 1-2, a system for evaluating the consistency of radiation emission tests between laboratories, the system comprises a reference source 2, a composite antenna 1 (i.e. a test antenna hereinafter), a radio frequency cable, a wall board connector 5, a receiver 4, a data processing system 3, and the like. Wherein the reference source 2 consists of a dressing source, a dressing source antenna and a test stand. In fig. 1, d is the test distance.
Wherein the dressing source is placed on the test stand, and the antenna with the corresponding frequency band is placed on the test point ((1), (2), (3), (4), (5), (6)) of the turntable, the composite antenna 1 and the receiver 4 are connected by using a radio frequency cable, and the radio frequency cable passes through the darkroom wall by using the wallboard connector 5. The data processing system 3 is used to connect the receiver 4 and to perform output processing and correction.
The method for evaluating the consistency of the radiation emission tests among the laboratories by using the system mainly comprises two stages of a stability test and a capability verification test of a reference source 2, and comprises the following main processes:
circulation and preparation of reference source 2
Reference source 2 during each laboratory cycle, the protection of reference source 2 should be done, taking care to be light, not to be violent, rain and snow drenching, etc. The environment should be stored in a dry and well ventilated environment, the surrounding should be free from corrosiveness, harmful gases and the like, and the environment should not be placed in an electromagnetic radiation environment or a high-temperature and high-cold environment. In the process, the package is checked and photographed for storage.
(1) Charging: connect the power adapter (ac 100 v-240 v,50Hz/60 Hz) to the comb source Charger port charge. If the power adapter electric quantity indicator lamp is a green indicator lamp, the comb-shaped source electric quantity is indicated to be sufficient, and if the electric quantity indicator lamp is a red indicator lamp, the comb-shaped source electric quantity is indicated to be insufficient, and charging is carried out until the electric quantity indicator lamp is the green indicator lamp.
Remarks: even if the reference source power indicator is green, the reference source power indicator is charged for at least 1 hour before the test is performed, the test process lasts for about 3 hours, the reference source power should be paid attention to in time during the test process, and once the reference source is found to have a feeding state during the test process, the test should be stopped immediately, the charging is performed, and the test is performed again.
(2) Stability test:
firstly, reference source inspection is carried out, and stability test is carried out after the inspection result is confirmed to be in accordance with the inspection standard. Connecting a reference source to a coaxial cable, the coaxial cable terminating the EMI receiver, and turning a switch ON the reference source to an ON position; the EMI receiver is set as an average detector, the bandwidth is 120kHz, the attenuation is 10dB when the EMI receiver is resided for 5ms, the EMI receiver is scanned under 14 characteristic frequency points in total of 32MHz, 40MHz, 55MHz, 70MHz, 90MHz, 115MHz, 150MHz, 200MHz, 270MHz, 350MHz, 460MHz, 600MHz, 750MHz and 900MHz, and the measurement result is recorded. The difference between the measurement result and the specified value (median value of expert unit test result) is calculated and recorded. If the difference is greater than 2dB, the reference source has stability problem and should be fed back in time.
(3) Before testing, the comb-shaped source electric quantity is sufficient, so that continuous testing is ensured;
(4) The comb-shaped source is powered by a built-in battery during testing, and the power adapter of the comb-shaped source is disconnected.
Detection conditions and device preparation
(1) Detecting equipment requirements
Meets the requirements of GB34660-2017 on electromagnetic compatibility requirements and test methods of road vehicles.
(2) Detecting an environment
The environment condition is detected according to the requirements of electromagnetic compatibility and test method of road vehicles in GB 34660-2017.
(3) Test method and test conditions
The method meets the requirements of GB34660-2017 on electromagnetic compatibility requirements and test methods of road vehicles.
(4) Maintenance and service of reference sources
The specification of the reference source usage specification should be met, and please carefully read the reference source usage specification.
(5) Background noise testing. The turntable is in a static normal power supply state, the rotating hub is in a 40km/h running state, the shaft of the rotating hub and the transverse shaft of the turntable are respectively 1.3m, and a metal cover plate is not arranged on the rotating hub;
the background noise should be below the 10m limit 6dB as specified in GB34660-2017 for horizontal and vertical polarizations of the antenna.
The instrument settings are shown in the following table:
the quasi-peak detection 10m limit is shown in the following table:
average detection 10m limit is shown in the following table:
reference source arrangement
(1) Test support
And installing a test support and a comb source, and installing a dressing source antenna.
(2) Reference source 2 placement orientation: when the test antenna is vertically polarized, the comb-shaped source antenna is vertically polarized, and the switch is opposite to the direction of the test antenna; when the test antenna is horizontally polarized, the dressing source is also horizontally polarized, and the switch is positioned right above, and the comb-shaped source antenna and the longitudinal axis direction of the turntable are overlapped.
Note that:
1) Definition of the left and right sides of the turntable: the right side of the vehicle is defined as the right side of the turntable when the test is actually carried out on the whole vehicle in the laboratory, and the left side of the vehicle is defined as the left side of the turntable when the test is actually carried out on the whole vehicle. As shown in fig. 3.
2) When the antenna is horizontally polarized and the right side of the turntable is close to the direction of the test antenna, the direction of the comb-shaped source antenna uniformly points to the tail part of the vehicle (right side facing the direction of the test antenna), as shown in fig. 4; when the left side of the turntable approaches the direction of the test antenna, the direction of the comb-shaped source antenna is uniformly directed to the tail of the vehicle (right side facing the direction of the test antenna), as shown in fig. 5.
Test
(1) Firstly, reference source inspection is required to be carried out, and after the inspection result is confirmed to be in accordance with the inspection standard, testing is carried out;
(2) The turntable is in a static normal power supply state, the rotating hub is in a 40km/h running state, the shaft of the rotating hub and the transverse shaft of the turntable are respectively 1.3m, and a metal cover plate is not arranged above the rotating hub;
(3) Rotating the turntable so that the transverse axis of the turntable coincides with the NSA test axis of the laboratory, as shown in figure 2;
(4) Moving the test antenna to make the vertical distance between the phase center and the vertical plane passing through the positions (1), (2) and (3) be 10 m+/-0.2 m, and the distance between the phase center and the ground of the darkroom be 3 m+/-0.05 m;
(5) Setting a quasi-peak detector (bandwidth 120kHz, residence time 1 s) and an average detector scanning mode (bandwidth 120kHz, residence time 1 s) of the receiver; (note: average detector set 1s residence time, test time saved for convenience and quasi-peak detector simultaneous test);
(6) Placing a reference source and a test rack in position (1);
(7) The test described in (8) below is performed when the test antenna is vertically polarized (when the comb-shaped source antenna is also vertically polarized) and the test antenna is horizontally polarized (when the comb-shaped source antenna is also horizontally polarized), respectively;
(8) When the comb-shaped source antenna is 12'', testing is carried out at 10 characteristic frequency points of 32, 40, 55, 70, 90, 115, 150, 200, 270 and 350MHz, specifically, continuous testing is carried out within the range of +/-60 kHz of the frequency point by using 120kHz detector bandwidth and 20kHz step length and 1s residence time, and the maximum value in the testing result is used as a measured value at the characteristic frequency point; when the comb-shaped source antenna is 5'', testing is carried out at 4 characteristic frequency points of 460, 600, 750 and 900MHz, specifically, in the range of +/-60 kHz of the frequency point, continuous testing is carried out at the bandwidth of a 120kHz detector and the step length of 20kHz and the residence time of 1s, and the maximum value in the testing result is used as the measured value at the characteristic frequency point. (it is sufficient to perform a point scan of 1s dwell time according to the frequency list given in Table 1);
(9) Translating the reference source and the support to a position (2) along the longitudinal axis of the turntable, and repeating the steps (7) and (8);
(10) Translating the reference source and the support to a position (3) along the longitudinal axis of the turntable, and repeating the steps (7) and (8);
(11) Translating the reference source and the support to a position (4) along the longitudinal axis of the turntable, and repeating the steps (7) and (8);
(12) Translating the reference source and the support to a position (5) along the longitudinal axis of the turntable, and repeating the steps (7) and (8);
(13) Translating the reference source and the support to a position (6) along the longitudinal axis of the turntable, and repeating the steps (7) and (8);
(14) Rotating the turntable for 180 degrees, and repeating the steps (7) - (13).
(15) After the test is completed, the reference source is checked, and after the check standard is confirmed, the comb-shaped source and the antenna are detached for boxing and transportation.
Table 1 test frequency points
Data statistics and analysis
(1) The effective number of the electric field measured value is reserved to 2 bits after the decimal point in the detection result;
(2) The original recording parameters for verifying the detection capability must be comprehensive, and the test condition can be accurately reproduced when the difference occurs; the observation result, data and calculation of each detection work should be correctly recorded during the work, and the original record is kept clean and complete; the original record should be kept well for verification.
(3) The detection capability verification expert group gathers the detection results of all laboratories and performs statistical analysis according to the following method:
CNAS-GL02 is planned to be adopted: 2014 'guidelines for statistical processing and capability assessment of capability verification results' performs statistical analysis and assessment on the results of each laboratory, namely, adopts a capability statistic difference value D to assess the results.
The difference D is calculated as:
；
；
wherein:-quasi-peak detection difference; />-detecting the difference in mean value; />-a participating laboratory quasi-peak detection test end value; />-a test end value of a detection test of a mean value in a laboratory; />-a specified value of quasi-peak detection;-a specified value for the average value detection; and (3) injection: the above values are all values of 14 characteristic frequency points.
According to the requirement of ISO 11451-2, 80% frequency points are selected as evaluation frequency points. The difference E in the capacity assessment is defined as 5.72dB based on the uncertainty recommendation in CISPR 12.
The D is less than or equal to 5.72dB and is a satisfactory result; wherein the result of the 12 characteristic frequency points meets the condition, otherwise, the result is unsatisfactory.
And taking the median value of the detection results of each laboratory as a designated value, and carrying out statistical technical treatment by a method of comparing the detection results of each laboratory with the designated value.
And when the standard deviation of all laboratory results is 1.5 times greater than that of expert group unit results, adopting standby true values. The standby true value is the median value of the four expert unit test results.
The final test results were 2 sets of test data, one set of quasi-peak values, and one set of average values. The quasi peak value result is the maximum value of all state test results in quasi peak detection, and the average value result is the maximum value of all state test results in average detection.
The invention can promote the consistency of test results among laboratories, intuitively understand the test difference among the laboratories and provide basis for developing the measurement test of the laboratories.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (4)
1. A method of testing a system for evaluating consistency of radiation emission tests between laboratories, comprising: the system comprises a composite antenna (1), a reference source (2), a radio frequency cable, a data processing system (3), a receiver (4) and a wallboard connector (5), wherein the composite antenna (1), the reference source (2) and the radio frequency cable are all positioned in a darkroom, one end of the radio frequency cable is connected with the composite antenna (1), the other end of the radio frequency cable penetrates through the darkroom inner wall to be connected with the receiver (4), the radio frequency cable penetrates through the wallboard connector (5) to penetrate through the darkroom inner wall, and the receiver (4) is in communication connection with the data processing system (3);
the reference source (2) comprises a dressing source, a dressing source antenna and a test support, wherein the dressing source is mounted to the test support, the dressing source antenna is mounted on one side of the dressing source, and the bottom of the test support is mounted to the turntable; the testing method comprises the following steps:
s1, circulation and preparation of a reference source (2);
s2, detecting conditions and preparing equipment;
s3, arranging a reference source (2);
s4, testing;
s5, data statistics and analysis;
in step S3, a reference source (2) is arranged, comprising the steps of:
s31, installing a test bracket and a comb source, and installing a dressing source antenna;
s32, placing azimuth of a reference source (2): when the test antenna is vertically polarized, the comb-shaped source antenna is vertically polarized, and the switch is opposite to the direction of the test antenna; when the test antenna is horizontally polarized, the dressing source is also horizontally polarized, and the switch is positioned right above, and the comb-shaped source antenna is overlapped with the longitudinal axis direction of the turntable;
in step S4, the experimental test comprises the steps of:
s41, firstly, requiring to check a reference source (2), and testing after confirming that a check result accords with a check standard;
s42, the turntable is in a static normal power supply state, the rotating hub is in a 40km/h running state, the shaft of the rotating hub and the transverse shaft of the turntable are respectively 1.3m, and a metal cover plate is not arranged above the rotating hub;
s43, rotating the turntable to enable the transverse axis of the turntable to coincide with the NSA test axis of the laboratory;
s44, moving the test antenna to enable the vertical distance between the phase center of the test antenna and a vertical plane passing through the positions of (1), 2 and 3 to be 10 m+/-0.2 m, and enabling the phase center to be 3 m+/-0.05 m away from the ground of the darkroom;
s45, setting a quasi-peak detector and an average detector scanning mode of the receiver (4);
s46, placing the reference source (2) and the test support at the position (1);
s47, performing the test in the step S48 when the test antenna is vertically polarized and the test antenna is horizontally polarized respectively;
s48, when the comb-shaped source antenna is 12', testing is carried out under 10 characteristic frequency points of 32, 40, 55, 70, 90, 115, 150, 200, 270 and 350MHz, specifically, in the range of +/-60 kHz of the frequency point, continuous testing is carried out by using 120kHz detector bandwidth and 20kHz step length and 1S residence time, and the maximum value in the testing result is used as a measured value under the characteristic frequency point; when the comb-shaped source antenna is 5', testing is carried out under 4 characteristic frequency points of 460, 600, 750 and 900MHz, specifically: continuously testing with 120kHz detector bandwidth and 20kHz step length and 1s residence time within the range of frequency points +/-60 kHz, wherein the maximum value in the test result is used as a measured value under the characteristic frequency point;
s49, translating the reference source (2) and the support to a position (2) along the longitudinal axis of the turntable, and repeating the step S47 and the step S48;
s410, translating the reference source (2) and the support to a position (3) along the longitudinal axis of the turntable, and repeating the step S47 and the step S48;
s411, translating the reference source (2) and the support to a position (4) along the longitudinal axis of the turntable, and repeating the step S47 and the step S48;
s412, translating the reference source (2) and the support to a position (5) along the longitudinal axis of the turntable, and repeating the step S47 and the step S48;
s413, translating the reference source (2) and the support to a position (6) along the longitudinal axis of the turntable, and repeating the step S47 and the step S48;
s414, rotating the turntable by 180 degrees, and repeating the steps S47-S413;
s415, after the test is completed, checking the reference source (2), and after confirming that the reference source meets the checking standard, detaching the comb-shaped source and the antenna for packing and transporting;
in step S5, the data is counted and analyzed, including the steps of:
s51, reserving the effective number of the electric field measured value in the detection result of the step S4 to 2 bits after the decimal point;
s52, recording original recording parameters for verifying the detection capability; recording the observation result, data and calculation of each detection work, and storing the original record;
s53, summarizing detection results of all laboratories, and carrying out statistical analysis;
in step S53, the statistical analysis is performed on the detection results of each laboratory, including the steps of:
s531, evaluating the result by adopting the capability statistic difference value D;
the capability statistic difference D is calculated as:
D QP ＝X QP -X QP ；
D AV ＝X AV -X AV ；
wherein: d (D) QP Detecting the difference value for the quasi peak value; d (D) AV Detecting the difference value for the average value; x is X QP The final value is tested for quasi peak detection in the participation laboratory; x is X AV Detecting a test end value for the average value of the participating laboratories; x is X QP A specified value for quasi-peak detection; x is X AV A specified value for average detection;
s532, selecting 80% frequency points as evaluation frequency points; defining the difference E in CISPR 12 to be 5.72dB; if the D is less than or equal to 5.72dB, the satisfactory result is obtained; otherwise, unsatisfactory results are obtained;
s533, taking the median value of the detection results of all laboratories as a designated value, and carrying out statistical technical treatment by a method of comparing the detection results of all laboratories with the designated value;
s534, when the standard deviation of all laboratory results is 1.5 times greater than the standard deviation of the appointed value, adopting a standby true value; the standby true value is the median value of the capability statistic difference value D;
s535, outputting the final test result.
2. A method of testing a system for evaluating consistency of radiation emission tests between laboratories according to claim 1, wherein: in step S1, the flow and preparation of the reference source (2) comprises the steps of:
s11, circulating the reference source (2) and protecting the reference source (2) during circulation;
s12, checking electric quantity of the reference source (2), and if the electric quantity is insufficient, charging a comb-shaped source charge port by connecting a power adapter to the reference source (2);
s13, disconnecting the comb-shaped source internal power adapter and testing the stability of the reference source (2).
3. A method of testing a system for evaluating consistency of radiation emission tests between laboratories according to claim 2, wherein: in step S13, a stability test is performed on the reference source (2), comprising the steps of:
s131, connecting the reference source (2) with a coaxial cable, wherein the coaxial cable is terminated with the EMI receiver (4);
s132, turning ON a switch ON the reference source (2);
s133, setting an EMI receiver (4) as an average value detector, wherein the bandwidth is 120kHz, the stay time is 5ms, and the attenuation is 10dB;
s134, scanning under 14 characteristic frequency points in total of 32MHz, 40MHz, 55MHz, 70MHz, 90MHz, 115MHz, 150MHz, 200MHz, 270MHz, 350MHz, 460MHz, 600MHz, 750MHz and 900MHz, and recording measurement results;
s135, calculating and recording the difference between the measurement result and the appointed value, and if the difference is greater than 2dB, the reference source (2) has stability problem and feeds back.
4. A method of testing a system for evaluating consistency of radiation emission tests between laboratories according to claim 1, wherein: in step S2, detection conditions and equipment preparation are performed, including the steps of:
s21, detecting equipment requirements;
s22, detecting the environment;
s23, a test method and test conditions;
s24, maintaining and maintaining the reference source (2);
s25, background noise testing.
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