4.3.9 GJB151B-2013 EUT test configuration
4.3.9.1 Overview
Unless otherwise specified, the EUT in all test projects of GJB151B-2013 shall be constructed in the test configuration as shown in Figure 1-5.
This content applies to all of the following test items.
| Item number | name | |
| 1 | CE101 | 25Hz—10kHz power cord conduction and emission |
| 2 | CE102 | 10kHz—10MHz power cord conduction and emission |
| 3 | CE106 | 10kHz－40GHz antenna terminal conduction and transmission |
| 4 | CE107 | Power cord spike signal (time domain) conduction and transmission |
| 5 | CS101 | 25Hz－150kHz power cord conduction sensitivity |
| 6 | CS102 | 25Hz－50kHz ground wire conduction sensitivity |
| 7 | CS103 | 15kHz－10GHz antenna terminal intermodulation conduction sensitivity |
| 8 | CS104 | 25Hz－20GHz antenna terminal useless signal suppression conduction sensitivity |
| 9 | CS105 | 25Hz－20GHz antenna terminal intermodulation conduction sensitivity |
| 10 | CS106 | Sensitivity of power cord peak signal transmission |
| 11 | CS109 | 50Hz－100kHz housing current conduction sensitivity |
| 12 | CS112 | Electrostatic discharge sensitivity |
| 13 | CS114 | 4kHz－400MHz cable bundle injection conduction sensitivity |
| 14 | CS115 | Cable bundle injection pulse excitation conduction sensitivity |
| 15 | CS116 | 10kHz－100MHz cable and power cord damping sinusoidal transient conduction sensitivity |
| 16 | RE101 | 25Hz－100kHz magnetic field radiation emission |
| 17 | RE102 | 10kHz－18GHz electric field radiation emission |
| 18 | RE103 | 10kHz－40GHz antenna harmonic and distortion output radiation emission |
| 19 | RS101 | 25Hz－100kHz magnetic field radiation sensitivity |
| 20 | RS103 | 10kHz－40GHz electric field radiation sensitivity |
| 21 | RS105 | Transient electric magnetic field radiation sensitivity |
4.3.9.2 EUT
The hardware and software of the EUT should be representative and in the working state of typical functions. Auxiliary programs can be added to the software to make it capable of performance evaluation.
Any temporary measures taken against the EUT during the test (such as the addition of filters, copper foil on the outside of the chassis, the use of anti-wave sleeves or magnetic rings for cables, etc.) should be recorded in the electromagnetic compatibility test report.
4.3.9.3 EUT lap
Only when specified in the EUT design and installation instructions, the equipment housing can be lapsed together with the mounting base, etc. or lapsed on the grounding lithography. The lap strip should be consistent with the provisions in the installation instructions.
4.3.9.4 Mounting frame with shock absorber
If a mounting frame with a shock absorber is used for the installation of the EUT, the EUT should be fixed to the mounting frame. The lap strip supplied with the mounting frame should be lapsed to the grounding plate. When the mounting frame does not have a lap strip, the lap strip should not be used.
4.3.9.5 Safely
When the EUT has an external terminal, connector pin, or equipment ground conductor that is safely connected and used for actual installation, it should be connected to the ground plate. Its layout and length should meet 4.3. 8.6. 1 requirement.
4. 3. 9.6 EUT orientation
The surface where the EUT produces the greatest radiation emission or the surface that responds most easily to the radiation signal should be oriented towards the test antenna.
The desktop EUT should be installed at 10cm±2cm from the front edge of the grounding plate so that it is 4.3.8.6.1 and 4.3. 8.6.2 Sufficient space is provided for the laying of cables in 8.6.2.
4. 3.9. 7 Structure and laying of EUT cable
4.3.9.7.1 Overview
The junction and type of the cable should simulate the actual use situation. Shielded cables are only used when specified in the installation requirements, or screens are used in the cables, but the input (main) power cord (including ground and ground wires) should not be shielded. Check the cables according to the installation requirements to determine whether the cables are used in accordance with the regulations, such as twisted pair, shielded and shielded termination. The arrangement information of the cable should be provided in the electromagnetic compatibility test report.
4. 3.9. 7. 2 Interconnection lines and interconnection cables
A single wire should be combined into a cable in the same way as in the actual installation. The total length of the interconnection cable in the test configuration should be the same as the length of the actual platform installation (at least 10m long when the ~degree of the cable exceeds 10m). When the cable length is not specified, the cable should be long enough to meet the following specified conditions: at least the first 2m segment of each interconnection cable terminated with the EUT (unless the actual installed cable length is shorter than 2m) should be parallel to the line at the boundary before the configuration, and the remaining length of the cable should be ”The Z" font is placed at the rear of the test configuration. When more than one cable is used in the configuration, each cable is arranged at a distance of 2cm from the outer skin. For desktop arrangements using ground plates, the cable closest to the front boundary should be placed 10cm from the front edge of the ground plane. All cables are supported by non-conductive supports and are located 5cm above the grounding plate. The dielectric constant of the supports should be as low as possible.
4.3.9. 7. 3 input (main) power cord
The input (main) power supply refers to the power supply directly provided by the system platform. The input (main) power cord refers to the EUT power cord directly connected to the input (main) power supply.
The 2m long input power cord (including loop) should be parallel to the front edge of the test configuration in the same manner as the interconnection line. Each input power cord, including the loop, should be connected to LISN. In the actual installation, the power cord that is part of the interconnection cable should be peeled off from the wiring harness (if the cable is a shielded cable, the tested power cord should be peeled off from the cable shield) and connected to LISN. After the power cord is exposed to a length of 2m, it is connected to LISN at the shortest distance. The total length of the power cord from the EUT connector to LISN should not exceed 2.5m. All power cords are supported by non-conductive supports and are located 5cm above the ground plate. The dielectric constant of the supports should be as low as possible. If the power cords are twisted pair in the actual installation, they should also be twisted pair before they are connected to LISN.
4. 3. 9. 8 Electrical and mechanical interfaces
All electrical input and output interfaces should be connected to the actual equipment installed on the platform, or to a load that can simulate the electrical characteristics (impedance, grounding, balance, power, etc.) presented in the actual installation. The input signal should be applied to the relevant interface to make all EUT circuits work. An EUT with a mechanical output should be loaded. When there is a variable electrical or mechanical load in the actual installation, it should be tested in the expected worst case. When using active electrical loads (such as test equipment), measures should be taken to ensure that the active loads meet the requirements of 4.3.4 without responding to the sensitivity test signal. For an EUT with a detachable antenna, the antenna port is terminated with a shielded matching load.
4.3. 10 EUT work
4. 3. 10. 1 overview
Test the launch. EUT should work in the state of maximum emission: sensitivity test. The EUT should work in the most sensitive state. The pair has several different states (including those controlled by software). Sufficient multiple-state tests of emission and sensitivity should be performed in order to evaluate all circuits.
4. 3. 10.2 The operating frequency of tunable radio frequency equipment
The test should be carried out in the following cases: within the range of each tuned frequency band, tunable unit, or fixed channel, the EUT should operate on not less than three frequencies. One of them is the center frequency of the frequency band, and the other two are the frequencies from the high end of each frequency band or channel range by 15% and the low end by +5%.
4.3. 10. 3 The operating frequency of the spread spectrum equipment
The operating frequency requirements of the two typical spread spectrum equipment are as follows：
a) Frequency hopping. The test should be carried out in a frequency hopping chess style of at least 30% of the entire available frequency group of the EUT. Frequency hopping is divided into low, medium and high segments within the operating frequency range of the EUT.
b) Direct sequence. The test should be carried out under the condition that the EUT processes data at the highest possible data transmission rate.
4.3. 10.4 Sensitivity monitoring
During the sensitivity test, the main performance of the EUT should be monitored for degradation or malfunction. Monitoring is usually achieved using in-machine self-test (BIT), image and character display, sound output, and other signal output and interface testing. It is allowed to install special circuits in the EUT to monitor the performance of the EUT, but these changes should not affect the test results.
- Creation date: July 23, 2020
- Revision date: July 2, 2024