1、GM DAEWOO Auto & Technology EDS Engineering, GM DAEWOO Auto & Technology Standards MOBILE TRANSMITTER TEST PROCEDURE Do Not Use on New Programs. Being Replaced by GMW3091 EDS-T-5522 ISSUED DATE: 1994. 11. 11 REVISED DATE: 2008. 11. 04 VERSION: 4 (Superceded) MOBILE TRANSMITTER TEST PROCEDURE EDS-T-5
2、522PAGE: 1/5 ISSUED DATE: 1994. 11. 11 REVISED DATE: 2008. 11. 04 VERSION: 4 GM DAEWOO Auto & Technology Note: This standard may be applied only for current project (incl. Variant Program). It is Superceded for all future projects and replaced by GMW3091. 1. PURPOSE This standard aims at specifying
3、the methods of testing immunity of the vehicle electric parts against electromagnetic field (narrow band electric fields) generated from the mobile transmitter that may be installed in the vehicle manufactured by GMDAT. 2. SCOPE This standard applies to all electric systems, subsystems and parts. 3.
4、 TEST SAMPLE CONDITIONS The test sample shall be mounted in the vehicle condition. 4. TEST EQUIPMENT 4.1. Signal generator 4.2. Directional coupler 4.3. Power sensor 4.4. Power meter 4.5. RF power amplifier 4.6. Monopole antennas 4.7. Handheld transmitter - 38 W 4.8. Isotropic field probe 4.9. Field
5、 monitoring system 5. TEST PREPARATION 5.1. Test place This test shall basically be conducted in the shielded absorber lined chamber. If allowed by the national regulations, test may be performed in OATS. It may also be performed in the shield room. In this case, such shall be indicated in the test
6、report. MOBILE TRANSMITTER TEST PROCEDURE EDS-T-5522PAGE: 2/5 ISSUED DATE: 1994. 11. 11 REVISED DATE: 2008. 11. 04 VERSION: 4 GM DAEWOO Auto & Technology 5.1.1. Absorber lined chamber This test shall basically be conducted in the chamber having characteristics stipulated in SAE J551/2. When it is co
7、nducted in the chamber, in the frequency at which the absorber does not function properly, reflection of the electromagnetic wave in the chamber may affect test results. Accordingly, special care is required when testing at this frequency. 5.1.2. Open area test site If allowed by the national regula
8、tions, test may be performed in OATS. In this case, attention shall be paid to conformance to harmonic suppression regulations. 5.1.3. Shield room When required by test, a shield room may be used. 5.2. Test temperature When the test vehicle is being operated, proper cooling shall be carried out to p
9、revent overheating of the engine. The standard temperature in the chamber is 235. When the above requirements cannot be met, the temperature shall be indicated in the test report. 5.3. Supply voltage For test requiring engine operation, an electric charging device shall be available. For test not re
10、quiring engine operation, the battery voltage shall be kept to at least 12.2V for the 12V system and 24.4V for the 24V system. 5.4. Vehicle conditions Under agreement between the tester and electric parts supplier, the test shall be conducted on a dynamometer either at a steady speed of 50kph or in
11、the idling conditions. 5.5. Electric parts conditions All electric parts mounted in the vehicle shall be operated in the normal operating mode. 6. TEST CONDITIONS 6.1. Test frequency The test frequency range is 1.8MHz - 1.3GHz. 6.2. Modulation When the transmitter installed in the vehicle is used, t
12、he modulator equipped in the transmitter shall be used. In case of test in which the transmitter is simulated that can be installed in the vehicle, the following is usually recommended unless special agreement is made between the tester and the vehicle manufacturer. 6.2.1. CW (Continuous Wave) 6.2.2
13、. 1KHz sine wave AM (amplitude modulation) 80% MOBILE TRANSMITTER TEST PROCEDURE EDS-T-5522PAGE: 3/5 ISSUED DATE: 1994. 11. 11 REVISED DATE: 2008. 11. 04 VERSION: 4 GM DAEWOO Auto & Technology 6.3. Dwell time At each frequency, the test sample shall be exposed to the electromagnetic interference for
14、 the minimum response time. In this case, this shall not be shorter than 2 seconds. 6.4. Test frequency step The frequency step shall be so set as not to exceed the maximum frequency step in Table 1 within the limit allowed by the equipment. When setting the frequency step, a logarithmic frequency s
15、tep may be used. In this case, the frequency step shall be adjusted so that test will be performed at the same or larger number of points as in the case of using the linear frequency step for each frequency. This value shall be recorded in the test report. When the threshold of the test sample appea
16、rs very close to the selected test level, the sizes of the frequency steps shall be subdivided in the related frequency range to find out the minimum threshold Note) In case the equipment cannot support the frequency step in Table 1, the frequency step shall be agreed on between the tester and test
17、sample manufacturer and indicated as such. 6.5. Electromagnetic intensity It is necessary to perform test with a transmitter capable of generating the power corresponding to each frequency range stipulated in Table 2. In case of test simulating the transmitter installed in the vehicle, signals gener
18、ated from the signal generator are amplified through the RF power amplifier and the power specified in Table 2 is transmitted through connection to the monopole antenna suitable for the frequency window. Note) In the transmitter simulation test, it is necessary to wind the RF choke (either ferrite o
19、r powdered iron toroid is used depending on the test frequency range) around the coaxial line to the antenna in order to reduce skin currents on the coaxial line and precisely model the transmitter. 6.6. Selection of monopole antenna used in simulation A 1/4 wavelength or 5/8 wavelength antenna may
20、be used. In the VHF and UHF bands, the 1/4 wavelength antenna is recommended, which can discharge more skin currents. Note 1) All antennas shall preferably be designed to have the lowest possible VSWR (generally 1.5: 1). It is desirable to select the antenna VSWR that does not cause changes in chara
21、cteristic coefficient of the RF amplifier used. There is one exception in tuning the antenna to have the minimum VSWR. It is when trying to induce a large amount of electromagnetic wave inside the vehicle by letting large skin currents flow on the antenna coaxial cable according to the test plan. No
22、te 2) VSWR is an intrinsic characteristic value regarding the transmission monopole antenna. This should not be adjusted when testing with the actual transmitter mounted in the vehicle. 7. TEST METHODS 7.1. Test plan Prior to the test, the test frequency, output, use of signal modulation, dwell time
23、, antenna to be used, antenna mounting position, vehicle operating mode and electric parts operating conditions shall be recorded in the test plan. MOBILE TRANSMITTER TEST PROCEDURE EDS-T-5522PAGE: 4/5 ISSUED DATE: 1994. 11. 11 REVISED DATE: 2008. 11. 04 VERSION: 4 GM DAEWOO Auto & Technology In cas
24、e of test with an actual transmitter mounted in the vehicle, transmitter wiring in the vehicle shall also be recorded. 7.2. Test procedures 7.2.1. Test with an actual transmitter mounted in the vehicle (1) Set the vehicle and electric parts in the vehicle to the modes specified in the test plan. (2)
25、 While scanning the frequency in each frequency window, apply the power specified in Table 2. (3) Record the forward power, backward power and the field level at the reference point in the vehicle. (4) In case of abnormalities, find out and record the minimum threshold. 7.2.2. Test with a simulated
26、transmitter (1) Set the vehicle and electric parts in the vehicle to the modes specified in the test plan. (2) Arrange the equipment as shown in Fig 1. (3) Place a monopole antenna on the vehicle roof, which represents each frequency window. While scanning the frequency in each frequency window, app
27、ly the power specified in Table 2. (4) Record the forward power, backward power and the field level at the reference point in the vehicle (5) With the same antenna placed at the center of the vehicle trunk, repeat above (1) (3). (6) Repeat the above test with a corresponding monopole antenna for eac
28、h frequency range. (7) In case of abnormalities, find out and record the minimum threshold. 7.2.3. Test with a handheld transmitter (1) Set the vehicle and electric parts in the vehicle to the modes specified in the test plan. (2) Operate the handheld transmitter to the maximum power while facing it
29、 toward the vehicle instrument panel. (3) In case of abnormalities, find out and record the minimum threshold. 8. TEST REPORT GENERATION Enter particulars related with the test, which include the test place, equipment, test vehicle spec, frequency, power and presence of troubles. 9. TEST EQUIPMENT C
30、ALIBRATION The power meter shall be capable of detecting the power supplied from the sampling system to an accuracy of 1dB and shall be calibrated regularly to prevent performance drop. 10. REFERENCES SAE J551/12 Vehicle Electromagnetic Immunity - on Board Transmitter Simulation ANSI C95.1 American
31、National Standard for Safety Levels with Respect to Human Exposure to Radio Frequency Electro-Magnetic Fields 3Khz to 300Ghz MOBILE TRANSMITTER TEST PROCEDURE EDS-T-5522PAGE: 5/5 ISSUED DATE: 1994. 11. 11 REVISED DATE: 2008. 11. 04 VERSION: 4 GM DAEWOO Auto & Technology Table 1. Test frequency step
32、Test frequency window Frequency step 1.8 MHz 5 MHz 0.2 MHz 5 MHz - 40 MHz 0.5 MHz 40 MHz 220 MHz 2 MHz 220 MHz 400 MHz 5 MHz 400 MHz 500 MHz 10 MHz 500 MHz 1000 MHz 20 MHz 1 GHz - 1.3 GHz 200 MHz Table 2. Transmitter power Test frequency Forward power (W) 1.8 MHz - 500 MHz 100 W 500 MHz - 1 GHz 80 W 1 GHz - 1.3 GHz 10 W Figure 1. Connection diagram of equipment to test vehicle electromagnetic immunity to mobile transmitter
