CN101191806A - Apparatus and method for testing automobile electromagnetic sensitivity - Google Patents
Apparatus and method for testing automobile electromagnetic sensitivity Download PDFInfo
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- CN101191806A CN101191806A CNA2006101571890A CN200610157189A CN101191806A CN 101191806 A CN101191806 A CN 101191806A CN A2006101571890 A CNA2006101571890 A CN A2006101571890A CN 200610157189 A CN200610157189 A CN 200610157189A CN 101191806 A CN101191806 A CN 101191806A
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Abstract
The invention discloses an apparatus for detecting the electromagnetic sensitivity of an automobile. For a heavy current injection detection, the invention comprises a power supply, an artificial power supply network, a current injection probe, a current monitor probe, a control unit, an interface card, a signal generator, a power amplifier, a first power unit and other units; for a freefield detection, the invention comprises the power supply, the artificial power supply network, a radio frequency emission antenna, a field intensity probe, the control unit, the interface card, the signal generator, the power amplifier, a field intensity monitor and other units. The invention can be adopted to achieve the heavy current injection automatic detection and the freefield automatic detection for automobile electronic products with high detection efficiency, can effectively reduce the labor intensity of detecting staffs, and reduce the possibility of detection errors.
Description
Technical field
The present invention relates to a kind of electromagnetic compatibility ATE (automatic test equipment) and method, be used for the electromagnetic susceptibility of automobile electronics is tested, the big electric current that especially is applied to automobile electronics injects test and free field test.
Background technology
Whether automobile electronics all need to carry out EMC test, wherein just comprise the test of electromagnetic susceptibility, can operate as normal under the electromagnetic interference (EMI) effect with the checking automobile electronics.Electromagnetic susceptibility is a reflection test product opposing interference capability.
The test of automobile electromagnetic sensitivity mainly was to be undertaken by the manual operation testing tool in the past.Owing to need carry out repeatedly repetitive operation to one or more instrument according to the working specification of test, also need note the experimental data of many instruments sometimes, this is very hard work beyond doubt for the experimenter, and efficient is low, and has the possibility of makeing mistakes.
Summary of the invention
The present invention proposes a kind of equipment and method of testing automobile electromagnetic sensitivity, realized controlling test process automatically, finish big electric current efficiently and inject automobile electromagnetic sensitivity test events such as test, free field test according to testing standard.
The equipment of a kind of testing automobile electromagnetic sensitivity that the present invention proposes, comprise: power supply, artificial mains network, injection probe and current monitoring probe, power supply is connected with test product with cable through the artificial mains network, and the cable that connects artificial mains network and test product passes injection probe and current monitoring probe.Also comprise: control module, interface card, signal generator, power amplifier, first power cell; Control module passes through the work of interface card control-signals generator, the Radio Frequency Interfere access power amplifier that signal generator produces, and the high power undesired signal after power amplifier will amplify applies electromagnetic interference (EMI) by injection probe to test product; The current monitoring probe feeds back to first power cell with the induction current intensity that monitors, and first power cell sends the induced signal intensity that monitors to control module by interface card; Control module is according to the induced signal intensity that receives and the deviation of demarcation signal intensity, and the output by interface card adjustment signal generator makes induced signal intensity reach the demarcation signal intensity level.
Preferably, also comprise second power cell, the one end is connected to interface card, and the other end is connected to the output terminal of power amplifier; Be used to measure the interference signal intensity that power amplifier produces, and the interference signal intensity value is sent to control module.Described second power cell has the dual input passage; be used for measuring simultaneously the forward power and the backward power of described power amplifier; described control module calculates the difference of forward power and backward power; when its during less than setting value; control module is adjusted the output signal of signal generator to initial value, with the protection power amplifier.
Preferably, described first, second power cell comprises power probe and power meter, and injection current or induction current intensity are by power probe feeding power meter, and power meter is measured the intensity of undesired signal or induced signal.
Preferably, be integrated with directional coupler in the described power amplifier, undesired signal inserts injection probe by directional coupler.
Preferably, described interface card is the GPIB card, and GPIB card one end links to each other with control module by pci interface; The other end links to each other with each testing tool by the GPIB cable, and each instrument that connects by the GPIB cable has different GPIB addresses.
The equipment of the another kind of testing automobile electromagnetic sensitivity that the present invention proposes, comprise: power supply, artificial mains network, radio-frequency transmissions antenna and field intensity probe, power supply is connected with test product with cable through the artificial mains network, and the cable horizontal parallel that connects artificial mains network and test product is placed on the insulcrete; Also comprise: control module, interface card, signal generator, power amplifier and field intensity monitor; Control module is by the work of interface card control-signals generator, the Radio Frequency Interfere access power amplifier that signal generator produces, the high power undesired signal after power amplifier will amplify applies electromagnetic interference by the radio-frequency transmissions antenna to test product; The field intensity probe feeds back to the field intensity monitor with the electromagnetic radiation field intensity signal that monitors by optical fiber, and the field intensity monitor sends the inductive electromagnetic radiation intensity that monitors to control module; Control module, reaches the inductive electromagnetic radiation intensity and demarcates the electromagnetic radiation intensity value by the output of interface card adjustment signal generator according to inductive electromagnetic radiation intensity that receives and the deviation of demarcating electromagnetic radiation intensity.
Preferably, also comprise second power cell, the one end is connected to interface card, and the other end is connected to the output terminal of power amplifier; Be used to measure the interference signal intensity that power amplifier produces, and the interference signal intensity value is sent to control module.Described second power cell comprises power probe and power meter, and injection current is by power probe feeding power meter, and power meter is measured the intensity of undesired signal.Described second power cell has the dual input passage; be used for measuring simultaneously the forward power and the backward power of described power amplifier; described control module calculates the difference of forward power and backward power; when its during less than setting value; control module is adjusted the output signal of signal generator to initial value, with the protection power amplifier.
Preferably, be integrated with directional coupler in the described power amplifier, undesired signal inserts the radio-frequency transmissions antenna by directional coupler.
Preferably, the field intensity monitor links to each other with control module by serial ports; Described interface card is the GPIB card, and GPIB card one end links to each other with control module by pci interface; The other end links to each other with each testing tool by the GPIB cable, and each instrument that connects by the GPIB cable has different GPIB addresses.
The method of a kind of testing automobile electromagnetic sensitivity that the present invention proposes comprises following treatment step:
1) determines the demarcation level of each frequency, control module determines that according to testing standard and nominal data controlled variable controls signal generator, make it produce Radio Frequency Interfere, controlled variable comprises: signal modulation system, depth of modulation, the initial frequency of output signal, initial output level; This Radio Frequency Interfere applies electric field by antenna or probe to test product through amplifying the back;
2) the test level value that monitors is fed back to control module, determine difference, and, adjust the output level of signal generator then according to the definite step value that the signal generator output level is regulated of this level difference value with the demarcation level ratio;
3) circulation execution in step 2), reach the demarcation level of this frequency up to the test level value, keep test level constant, at the resident certain hour of this frequency, the test test product is in the electromagnetic susceptibility parameter of this frequency;
4) next frequency to the test frequency range carries out the test process of step 1) to step 3), all tests until all frequencies of test frequency range and finishes.
Preferably, determine the following regulative mode of the concrete employing of step value rapid 2):
△＝a*(exp(b*d
p)-1)
△ is the step value that output level is regulated, d
pFor test level with the difference of demarcating level in advance, a, b are the coefficient of determining at concrete test.The step value △ value of level adjustment by force to be limited in-0.5～20dB between, least unit is 0.1dB.
Preferably, initial output level is-60dB in the step 1).
Preferably, the test test product comprises specifically in the electromagnetic susceptibility parameter of this frequency whether following process: a. monitoring test product performance sensitivity occurs in the step 3); B. responsive as occurring, the responsive threshold level when then determining sensitivity to occur, and form responsive threshold level curve.
Adopt testing apparatus of the present invention and method, the effect of its generation is: (1) test process is based on testing standard and nominal data, on a series of frequencies in the regulation frequency range, by automatically test product being imposed particular level, come the driving power amplifier producing certain test current on the wire harness and in the space, producing certain test electric field by the radio-frequency transmissions antenna.The test current that test level produces can reach 100mA, and the test electric field can reach 100V/m.Be suitable for the electromagnetic susceptibility test of various automobile electronics.(2) because the method that adopts closed loop to control automatically realizes the electromagnetic susceptibility test to test product, testing efficiency height.By noting the sensitivity value of test product each frequency under electromagnetic interference (EMI), the limit value of test data and standard-required is compared, judging that whether qualified test product is, and generate the testing journal sheet.Reduce the labour intensity of testing crew effectively, reduced the possibility of makeing mistakes greatly.(3) this testing apparatus can be when power amplifier be in light condition owing to being provided with second power control unit, and control module is in time adjusted the output of signal generator, reaches the effect of protection power amplifier.(4) this testing apparatus as interface card, can realize the communication between control module and the instrument and equipment by practical GPIB card easily, and dependable performance is stable.
Description of drawings
Fig. 1 is that big electric current of the present invention injects testing apparatus preferred embodiment schematic diagram;
Fig. 2 is a free field testing apparatus preferred embodiment schematic diagram of the present invention.
Embodiment
Two preferred embodiments and drawings injecting test and free field test below in conjunction with big electric current are described in further detail the present invention:
A) big electric current injects (BCI) test
Big electric current injects test and is mainly used in the detection test product under user mode, to the susceptibility of induction current effect.Component devices has control module, GPIB card, signal generator, power amplifier, power meter, injection probe, current monitoring probe, power supply and artificial mains network etc.Wherein control module, GPIB card, signal generator, power amplifier, power meter are placed in the pulpit, injection probe, current monitoring probe, power supply and artificial mains network, and test product is placed on the ground connection flat board of screened room.Its schematic diagram is seen Fig. 1.
At least have a PCI slot in the control module, be used to insert interface card, interface card adopts the GPIB card, specifically can use the PCI-GPIB card of America NI company.This PCI-GPIB card is standard 24 core joints, can connect 14 instruments at most, and peak data transfer rate 1.5MB/s follows IEEE 488.2 agreements.The GPIB cartoon is crossed the GPIB cable and is connected with instrument, realizes the communication between Control Software and the instrument and equipment, and in the present embodiment, the GPIB cartoon is crossed the GPIB cable and is connected to signal generator, two power meters totally three instruments, every different GPIB address of instrument definition.
Control module produces Radio Frequency Interfere by GPIB card control signal generator, is used for the simulaed interference signal source.Signal generator uses forward QF1481 type synthesized signal generator, and frequency range is 100kHz～2.1GHz, and power bracket is-127～+ 16dBm, have AM, PM internal modulation function.
Signal generator is by shielded cable access power amplifier, and power amplifier is used for the Radio Frequency Interfere that signal generator produces is enlarged into high-power undesired signal.Use the AP32DT214 power amplifier of PRANA company, frequency range is 10kHz～1000MHz, and peak power output is 400W.
The high power undesired signal is linked into injection probe by directional coupler integrated in the power amplifier, and the simulation electromagnetic interference source applies electromagnetic interference (EMI) to test product.
Through the power meter that power probe is connected with directional coupler, be used to measure the intensity of the actual undesired signal of sending of power amplifier, control program is by the test data of GPIB card readout power meter.This power probe and power meter are formed second power cell.Power meter uses the PM2002 of AR company, is equipped with PH2000 series power probe, and frequency range is 10kHz～100GHz, and power bracket is-70～+ 44dBm.This power meter has the dual input passage, can measure the forward power and the backward power of power amplifier simultaneously, the load condition of the difference reaction power amplifier of forward power and backward power.The forward power that reads when program and the difference of backward power during less than a setting value (as 1dBm; program can be according to the test-types automatic setting) time; think that promptly power amplifier is in light condition; the output level of program energy automatic control signal generator drops to initial value (60dBm), with the protection power amplifier.
The current monitoring probe is with induction current intensity, and through power probe feeding power meter, control program monitors the variation of induced signal intensity by the numerical value of GPIB card readout power meter.This power probe and power meter are formed first power cell.When induced signal intensity when demarcation signal intensity has deviation in advance, adjust the output level of signal generator, the induced signal intensity that monitors up to power meter reaches demarcation signal intensity level in advance; If the actual forward power of adjusting to power amplifier does not reach the demarcation level value when demarcating 3 times of forward power yet, then stop to adjust, finish the test of this Frequency point.Being a kind of closed loop method tests.
Power supply is connected with test product with cable through the artificial mains network, and the voltage of test product operate as normal is provided.Power supply is an accumulator, and power and output voltage are determined by the power requirement of test product.Artificial mains network's function provides 50 ohm impedance matching and realizes power filter.The cable that connects artificial mains network and test product passes injection probe and current monitoring probe.
B) free field test
The free field test is the holding capacity of examination test product to radiated electric field, observes it and performance reduction or fault whether can occur.Component devices comprises control module, GPIB card, signal generator, power amplifier, power meter, radio-frequency transmissions antenna, field intensity probe, field intensity monitor, power supply and artificial mains network.Wherein control module, GPIB card, signal generator, power amplifier, power meter and field intensity monitor are in the pulpit, radio-frequency transmissions antenna, field intensity probe, power supply and artificial mains network, and test product is placed on the ground connection flat board of semi-anechoic chamber.Test product is exposed in the radiation field that is produced by radio-frequency antenna to be tested.Its schematic diagram is seen Fig. 2.
The free field test is identical in the system's formation and the principle of work of pulpit control section with big electric current injection test macro.Also be that control module passes through GPIB card control signal generator generation Radio Frequency Interfere, undesired signal amplified by power amplifier.
The high power undesired signal is linked into the radio-frequency transmissions antenna by directional coupler integrated in the power amplifier by shielded cable, launches with the form of electromagnetic radiation, is used to simulate the radiation interference to test product.The radio-frequency transmissions antenna uses the AT4001 of AR company, and frequency range is 400MHz～1000MHz.
The effect of field intensity probe is near the electromagnetic radiation intensity the induction test product, by optical fiber with the field intensity signal field intensity monitor of feeding.The 9pin serial line interface that control module has based on RS232 links to each other with the field intensity monitor.Control module reads the test data of field intensity monitor by serial ports.The field intensity monitor uses the FM4000 of AR company, and the field intensity probe uses three field intensity probes of FP6001 of AR company.The closed loop method is applied to the free field test equally, and just test level is an intensity level, obtains by the field intensity monitor.
The power supply of test product provides through the artificial mains network by power supply.Power supply is an accumulator, and power and output voltage are determined by the power requirement of test product.Artificial mains network's function provides 50 ohm impedance matching and realizes power filter.The cable horizontal parallel that connects artificial mains network and test product is placed on the insulcrete.
Below method of testing of the present invention is specifically described.Generally before test, need cable and system are demarcated.
(1) cable is demarcated: will be demarcated cable and be connected between signal generator and the power meter, and the signal of a set level of signal generator output, power meter reads the actual level value, and difference between the two is the pad value of this cable.Because, between signal generator and power amplifier, power amplifier and power meter, power amplifier and injection probe, power amplifier and radio-frequency transmissions antenna, current monitoring probe and power meter, all connect by shielded cable.Different shielded cables has different pad values, in test process pad value is paid attention to and can improve the precision of test.
(2) system calibrating:
1. determine test grade (being calibration value) according to the requirement of different product, inject test, can select different measuring currents such as 60mA, 80mA, 100mA for big electric current; For the free field test, can select different test levels such as 60V/m, 80V/m, 100V/m.
2. the formation of calibration system: inject test at big electric current, there is not this part of power supply, artificial mains network and test product in the calibration system, but replace by calibration facility, calibration facility is that 50 ohm terminator, shielded cable, 40dB attenuator constitutes by a resistance value, terminator is connected to first power cell by the attenuator of a shielded cable process 40dB who demarcated, and shielded cable is passed injection probe.In the free field test, calibration system also is not have this part of power supply, artificial mains network and test product, demarcates the field intensity probe and substitutes the field intensity probe.
3. calibration process:
Big electric current is injected test, the frequency range of calibration process is identical with corresponding test process, signal generator uses continuous wave (unmodulated wave) to demarcate, the power level that signal generator sends is after power amplifier amplifies, on the shielded cable of calibration facility, produce induction current and detect the induced electricity flow valuve by injection probe, and with this current value with the test grade (for example 60mA) compare, if reaching the test grade, output current value then do not need to continue to adjust the signal generator output power levels, till reaching the test class requirement.If output current reaches the test class requirement is then noted this moment by controlling computer frequency and signal generator output level, power amplifier forward power.Require to repeat above demarcating steps according to different frequency step, up to the demarcation of finishing whole frequency range.Data such as the frequency that is write down and signal generator output level, power amplifier forward power are the nominal data of system.
Test for free field, use the field intensity probe to demarcate, the frequency range of calibration process is identical with corresponding test process, signal generator uses continuous wave (unmodulated wave) to demarcate, the power level that signal generator sends is after power amplifier amplifies, produce electric field by antenna, the field intensity probe is monitored the electric field value that is produced by antenna simultaneously, and with this electric field value with the test grade (for example 60V/m) compare, if reaching the test grade, the output electric field value then do not need to continue to adjust the signal generator output power levels, till reaching the test class requirement; If reaching the test class requirement, the output electric field then notes the frequency of signal generator and signal generator output level, power amplifier forward power this moment by controlling computer.Require to repeat above demarcating steps according to different frequency step, up to the demarcation of finishing whole frequency range.Data such as the frequency that is write down and signal generator output level, power amplifier forward power are the nominal data of system.
Inject test macro nominal data, free field test macro nominal data and electromagnetic compatibility test standard according to cable nominal data, big electric current, can determine the controlled variable of control module to signal generator, controlled variable mainly comprises: signal modulation system, depth of modulation, the initial frequency of output signal, initial output level, and be used for the demarcation level that compares with test level.
Test process of the present invention (comprising that big electric current injects test and free field test) is: testing dot frequency generation electric field, (injecting test for big electric current is power level to increase output level gradually according to certain rule and speed, test is an intensity level for free field, down together), initial output level is generally-60dB, reach up to the test level that reads from surveying instrument (injecting test for big electric current is power meter, and test is the field intensity monitor for free field) and to demarcate in advance till the level.The adjustment process of test level is: by sending the instruction that comprises frequency and output level to signal generator, and after the measurement stabilization time through instrument, the test level value of read test instrument.By test level with the difference of demarcating level in advance, according to certain algorithm, determine the step value of signal generator output level, determine the output level of signal generator next time thus.When test level and the difference of demarcating level in advance were big, step value was also bigger, otherwise less, makes the rapid and precise convergence of test level demarcate level in advance.Specific algorithm can be:
△＝a*(exp(b*d
p)-1)
In the formula, △ is the step value that output level is regulated, d
pFor test level with the difference of demarcating level in advance, a, b are the coefficient of determining at concrete test.The △ value forces to be limited in-0.5～20dB between, least unit is 0.1dB.With respect to manually operated mode (regulating the most significant digit of output level, an inferior high position successively by the button on the signal generator panel, until lowest order), by programme controlled mode, testing efficiency improves greatly with the adjusting accuracy.
When the monitoring test level reach demarcate level in advance after, keep test level constant,, observe test product performance whether responsive (being subjected to appreciable impact) in this course simultaneously at the resident certain hour of this frequency, as sensitivity appears, then write down this sensitive frequency point.
According to the frequency step value that is provided with, next frequency of testing frequency range is carried out same test, all test until all frequencies of test frequency range and finish.After treating the full frequency band end of test (EOT), the responsive threshold level when testing to determine that this frequency begins sensitivity to occur by single frequency again.Responsive threshold level is lower than the value of demarcating level (being limiting level) in advance certainly.In the responsive threshold level of sensitive frequency point with at the demarcation level of other Frequency point, form responsive threshold level curve according to the test product of noting, test is obtained data handle, generate the testing journal sheet at last.In test process, when reading in the value of power meter, field intensity monitor, all read continuously 4 times, average, to improve measuring accuracy.Because the time of reading for 4 times on hundred milliseconds of orders of magnitude, does not therefore influence testing efficiency.
Claims (17)
1. the equipment of a testing automobile electromagnetic sensitivity, comprise: power supply, artificial mains network, injection probe and current monitoring probe, power supply is connected with test product with cable through the artificial mains network, and the cable that connects artificial mains network and test product passes injection probe and current monitoring probe; It is characterized in that, also comprise: control module, interface card, signal generator, power amplifier, first power cell;
Control module passes through the work of interface card control-signals generator, the Radio Frequency Interfere access power amplifier that signal generator produces, and the high power undesired signal after power amplifier will amplify applies electromagnetic interference (EMI) by injection probe to test product;
The current monitoring probe feeds back to first power cell with the induction current intensity that monitors, and first power cell sends the induced signal intensity that monitors to control module by interface card;
Control module is according to the induced signal intensity that receives and the deviation of demarcation signal intensity, and the output by interface card adjustment signal generator makes induced signal intensity reach the demarcation signal intensity level.
2. the equipment of testing automobile electromagnetic sensitivity according to claim 1 is characterized in that, also comprises second power cell, and the one end is connected to interface card, and the other end is connected to the output terminal of power amplifier; Be used to measure the interference signal intensity that power amplifier produces, and the interference signal intensity value is sent to control module.
3. the equipment of testing automobile electromagnetic sensitivity according to claim 2, it is characterized in that, described first, second power cell comprises power probe and power meter respectively, injection current or induction current intensity are by power probe feeding power meter, and power meter is measured the intensity of undesired signal or induced signal.
4. according to the equipment of claim 1 or 2 arbitrary described testing automobile electromagnetic sensitivities, it is characterized in that be integrated with directional coupler in the described power amplifier, undesired signal inserts injection probe by directional coupler.
5. the equipment of testing automobile electromagnetic sensitivity according to claim 2; it is characterized in that; described second power cell has the dual input passage; be used for measuring simultaneously the forward power and the backward power of described power amplifier; described control module calculates the difference of forward power and backward power; when its during less than setting value, control module is adjusted the output signal of signal generator to initial value, with the protection power amplifier.
6. according to the equipment of claim 1 or 2 arbitrary described testing automobile electromagnetic sensitivities, it is characterized in that described interface card is the GPIB card, GPIB card one end links to each other with control module by pci interface; The other end links to each other with each testing tool by the GPIB cable, and each instrument that connects by the GPIB cable has different GPIB addresses.
7. the equipment of a testing automobile electromagnetic sensitivity, comprise: power supply, artificial mains network, radio-frequency transmissions antenna and field intensity probe, power supply is connected with test product with cable through the artificial mains network, and the cable horizontal parallel that connects artificial mains network and test product is placed on the insulcrete; It is characterized in that, also comprise: control module, interface card, signal generator, power amplifier and field intensity monitor;
Control module is by the work of interface card control-signals generator, the Radio Frequency Interfere access power amplifier that signal generator produces, the high power undesired signal after power amplifier will amplify applies electromagnetic interference by the radio-frequency transmissions antenna to test product;
The field intensity probe feeds back to the field intensity monitor with the electromagnetic radiation field intensity signal that monitors by optical fiber, and the field intensity monitor sends the inductive electromagnetic radiation intensity that monitors to control module;
Control module, reaches the inductive electromagnetic radiation intensity and demarcates the electromagnetic radiation intensity value by the output of interface card adjustment signal generator according to inductive electromagnetic radiation intensity that receives and the deviation of demarcating electromagnetic radiation intensity.
8. the equipment of testing automobile electromagnetic sensitivity according to claim 7 is characterized in that, also comprises second power cell, and the one end is connected to interface card, and the other end is connected to the output terminal of power amplifier; Be used to measure the interference signal intensity that power amplifier produces, and the interference signal intensity value is sent to control module.
9. the equipment of testing automobile electromagnetic sensitivity according to claim 8 is characterized in that, described second power cell comprises power probe and power meter, and injection current feeds back to power meter by power probe, and power meter is measured the intensity of undesired signal.
10. according to Claim 8 or the equipment of 9 described testing automobile electromagnetic sensitivities; it is characterized in that; described second power cell has the dual input passage; be used for measuring simultaneously the forward power and the backward power of described power amplifier; described control module calculates the difference of forward power and backward power; when its during less than setting value, control module is adjusted the output signal of signal generator to initial value, with the protection power amplifier.
11. the equipment according to claim 7 or 8 described testing automobile electromagnetic sensitivities is characterized in that, is integrated with directional coupler in the described power amplifier, undesired signal inserts the radio-frequency transmissions antenna by directional coupler.
12. the equipment according to claim 7 or 8 described testing automobile electromagnetic sensitivities is characterized in that the field intensity monitor links to each other with control module by serial ports; Described interface card is the GPIB card, and GPIB card one end links to each other with control module by pci interface; The other end links to each other with each testing tool by the GPIB cable, and each instrument that connects by the GPIB cable has different GPIB addresses.
13. the method for a testing automobile electromagnetic sensitivity is characterized in that, described method comprises following treatment step:
1) determines the demarcation level of each frequency, control module determines that according to testing standard and nominal data controlled variable controls signal generator, make it produce Radio Frequency Interfere, controlled variable comprises: signal modulation system, depth of modulation, the initial frequency of output signal, initial output level; This Radio Frequency Interfere applies electric field by antenna or probe to test product through amplifying the back;
2) the test level value that monitors is fed back to control module, determine difference, and, adjust the output level of signal generator then according to the definite step value that the signal generator output level is regulated of this level difference value with the demarcation level ratio;
3) circulation execution in step 2), reach the demarcation level of this frequency up to the test level value, keep test level constant, at the resident certain hour of this frequency, the test test product is in the electromagnetic susceptibility parameter of this frequency;
4) next frequency to the test frequency range carries out the test process of step 1) to step 3), all tests until all frequencies of test frequency range and finishes.
14. the method for testing automobile electromagnetic sensitivity according to claim 13 is characterized in that, described step 2) in determine that step value is concrete and adopt following regulative mode:
△＝a*(exp(b*d
p)-1)
△ is the step value that output level is regulated, d
pFor test level with the difference of demarcating level in advance, a, b are the coefficient of determining at concrete test.
15. the method for testing automobile electromagnetic sensitivity according to claim 14 is characterized in that, the step value △ value of level adjustment by force to be limited in-0.5～20dB between, least unit is 0.1dB.
16. the method according to the arbitrary described testing automobile electromagnetic sensitivity of claim 13-15 is characterized in that, the initial output level in the described step 1) is-60dB.
17. the method for testing automobile electromagnetic sensitivity according to claim 13 is characterized in that, the test test product specifically comprises following process in the electromagnetic susceptibility parameter of this frequency in the described step 3):
A. monitor the test product performance and sensitivity whether occurs;
B. responsive as occurring, the responsive threshold level when then determining sensitivity to occur, and form responsive threshold level curve.
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