Keeping your Sanity when using SAE J 1113

Keeping Your Sanity When Using Sae J 1113-Free PDF

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the functions of automotive electronic devices upon the DRFI SAE J 1113 4 is an alternative method covering. application of the test conditions specified as described 1 MHz to 400 MHz using the Bulk Current Injection BCI. in appropriate EMC test standards for example the SAE method J 1113 4 is used to simulate the effect of the. J1113 series and the SAE J551 series Testing of DUT Device Under Test and its wire harness when both. devices could be performed either on or off vehicles are in the field of high power transmitting antennas on or. Appropriate test signal and methods region of off the vehicle While a few equipment manufacturers. performance and test signal severity level would have to specify both J 1113 3 and J 1113 4 most use only one. be specified in the individual cases or the other Recently there has been a trend toward J. 1113 4 as a result of its simulation of the probable source. In order to use SAE J 1812 it is necessary to establish of problems coming from EMI RFI Most Equipment. the Functional Status Classification Region of Manufacturers specify the suggested test levels in the. Performance and the Test Signal Severity Level respective Appendices There are exceptions We have. Functional status is fairly well defined and selecting seen requests for test levels of 800 mW for J 1113 4. either Class A B or C should be relatively straight versus the suggested 500 mW in Appendix B and 125. forward The Region of Performance is then defined in mA for J 1113 4 versus the suggested 100 mA in. Appendix A Figure A1 Then comes the million dollar Appendix A. question the Test Signal Severity Level The, specification provides no help in establishing the value of. V for the conducted Transient Injection test or the value. of E for Radiated Immunity tests It only describes the. philosophy for developing the values,Fig 2 J 1113 4 BCI Test Setup. The Immunity to Conducted Transients on Power Leads. test J 1113 11 is similar to the three Standards above. except the test is to determine the immunity of the DUT. to interference from conducted transients resulting from. disturbances elsewhere on the power supply bus The. test levels are defined as 12 Volt systems on passenger. car and light duty trucks 12 Volt systems on heavy duty. trucks and 24 Volt systems Unless the system to be. tested is specifically targeted for less than 24 Volt. Fig 1 J 1812 Function Performance Status on systems the testing specified should follow the 24 Volt. Classification requirements Please note that many of the features that. machine designers are becoming accustomed to may not. The SAE J 1113 series only has suggested or be available economically This is due to the. recommended values for the test levels in the requirement to being able to withstand the specified 150. Appendices and in one case J 1113 21 they give an VDC open circuit voltage This becomes troublesome if. example The lone exception is SAE J 1113 13 which the DUT is classified as Class C controls or affects the. covers ESD testing essential operation of the vehicle also sometimes. identified as life threatening,THE USE OF SAE J 1113 TO DETERMINE THE. PROPER TESTS FOR YOUR APPLICATION,CONDUCTED INTERFERENCE IMMUNITY. SAE J 1113 2 3 4 11 and 12 cover conducted, immunity J 1113 2 and 3 are complimentary in that 2.
covers from 30 Hz to 250 kHz and J 1113 3 covers from. 250 kHz to 500 MHz Both use direct injection methods. also referred to as Direct Radio Frequency Injected. SAE J 1113 23 uses the Strip Line method of radiated. electromagnetic fields to test the DUT and the harness by. placing them on an insulated surface that is mounted on a. ground plane with a strip line over the cables The strip. line is energized by a RF amplifier to the desired level. The suggested maximum power is 200 V M, Fig 3 J 1113 11 Test Setup for Conducted Transient. RADIATED INTERFERENCE IMMUNITY,SAE J 1113 21 22 23 25 26 and 27 cover Radiated. Immunity to EMI RFI SAE J 1131 21 covers the, Compatibility Measurement Procedure for 10 kHz to 18. GHz when tested in Absorber Lined Chamber ALC, This procedure is designed to simulate open field testing. The test room is shielded room the has at least the four Fig 5 J 1113 23 Strip Line Test Configuration. walls and the ceiling lined with EMI RFI absorbing. material that is generally some type of ferrite material to Per J 1113 23 dated 1995 09 this method is being. reduce the reflectivity of the room The suggested replaced by the Tri plate Line SAE J1113 25 which is. severity level 6 is 100 V M A number of customers are considered to be a superior test method The five year. now requesting test levels of 150 200 or more V M grace period ends in 2000 when the Standard will be. The Tri plate method contained in SAE J 1113 25 is. used for 10 kHz to 500 MHz testing of the DUT and the. wire harness for immunity to electromagnetic fields The. test is superior in that it places both the DUT and the. cables under the direct radiation of the tri plate The. method of construction also allows larger DUTs to be. placed within the cell in an area of uniform EMI RFI. fields The maximum power level suggested in Appendix. C is 200 V M,Fig 4 J 1113 21 Test Configuration,POWER LINE AC FIELD INTERFERENCE IMMUNITY.
Immunity to AC Power Line Electric Fields is a unique. problem that is far more prevalent with Off Road, Machinery Operation of Machinery under the extreme. high tension transmission lines can result in exposure to. field levels in excess of 15 000 V M This problem has. resulted in two SAE Standards J 1113 22 and J 1113 26. The two specifications approach the testing in different. ways J 1113 22 is designed to test to a given Magnetic. Field Intensity The recommended maximum test level is. 80 T with the field generated by the use of two,Helmholtz Coils. Fig 6 J 1113 25 Tri Plate Test Configuration, SAE J 1113 27 is for testing from 500 MHz to 2 GHz and. is sometimes used over the range of 200 MHz to 10,GHz This Standard uses a Reverberation Chamber. reducing the size of the test chamber The, Reverberation Chamber can be correlated to vehicle.
level radiated immunity testing in an anechoic chamber. Appendix C recommends a maximum test level of 100,V M Fig 8 J 1113 22 Magnetic Field Test Setup. J 1113 26 is designed to test to a given EMI RFI Field. level The recommended maximum test level is 15 00,V M with the field generated by the use of two. Conductive Plates and two Field Distribution Wires 26. is generally the test of choice for off road equipment. Fig 9 J 1113 26 Parallel Plate Field Generator,Fig 7 J 1113 27 Reverberation Method. BATTERY POWER LINE EMISSIONS AND NOTE SAE J 1455 Joint SAE TMC Recommended. TRANSIENTS Environmental Practices for Electronic Equipment Design. Heavy Duty Trucks also addresses vehicle transient. Because of the unique problems resulting from switching voltage characteristics Tables 4A and 4B list the test. or operating inductive loads SAE has a Standard requirements It is suggested that if compliance with J. specifically to test for the transients that can be created 1455 is required that the electrical transient testing be. by Mobile Equipment SAE J 1113 42 uses a test done at the same time as testing for J 1113 42. procedure that simulates the effects of the real load by. switching the supply to from an Artificial Network AN. The AN is a 5 H coil that can handle a 50 A load The. equipment and preferably the DUT are set up over a. ground plane Proposed limits for level IV are 100 V to. Fig 10 J 1113 42 Single Transient Waveform,Fig 12 J 1455 Transient Voltage Characteristics. WHAT ME CAUSE INTERFERENCE,SAE J 1113 41 Standard for Limits and Methods of.
Measurement of Radio Disturbance Characteristics of. Components and Modules for the Protection of Receivers. used On Board Vehicles covers testing to determine the. level of emissions from the DUT that may interfere with. onboard receivers The Standard is useable for Mobile. equipment and is equivalent to IEC CISPR 25 1, Most equipment builders building for the North American. market prefer to use the FCC Part 15 Class A test While. there is considerable discussion about the need for this. test does the DUT need to meet the FCC requirements. the general feeling is if it has a microprocessor I might. Fig 11 J 1113 42 Bursts Transient Waveform, have to certify it in the future Test houses generally. consider the J 1113 42 to be a better test The cost of. obtaining a test report for Part 15 using the test data from RADIATED IMMUNITY TEM J 1113 24 Not yet. J 1113 42 done by an independent test house is released by SAE While companies that use this future. insignificant If the equipment will need to be certified Standard all have slightly different specifications pending. later for a CE mark the J 1113 42 report should also be release of 24 all of the ones that I am aware of specify. prepared for meeting CISPR 25 format 100 V M for Region II They generally use 100 kHz to. WHAT ARE OTHERS USING FOR TEST STANDARDS RADIATED IMMUNITY STRIP LINE METHOD J 1113. AND WHAT LIMITS ARE THEY SPECIFYING 23 This Standard has not enjoyed widespread. acceptance This is because the test places most of the. What to specify if you do not use the suggested or emphasis on energizing the wiring harness not the DUT. recommended values in the J 1113 Standards is one of RADIATED IMMUNITY TRI PLATE METHOD J 1113. the hottest topics in Mobile Equipment manufacturing 25 This is another Standard where a few manufacturers. today The component manufacturers are even more in are asking for test levels higher than the suggested test. a quandary Do they do what the machine levels One in particular has stretched the frequency. manufacturers say and possibly waste their customer s range from 500 MHz to 1 GHz with Region II at 200 V M. money Or do they argue with the customer and and Region I at 100 V m for the extended frequency. possibly lose the order With some customers range Same problem as before it costs money and. sometimes doubling the severity of the test parameters it time. is tough to keep quiet, The other Standards did not have enough responses to. To quickly review each of the major use standards and comment on anything except that the few that replied all. compare the standard versus the range being requested were using the suggested or recommended test. in the market might help The market ranges are those procedures and levels. levels being requested by customers and levels being. used as researched by the author Unfortunately WHY THE APPROVED COMPONENTS FAIL ON. because almost everyone has requested anonymity I YOUR MACHINE. cannot list those companies that contributed to the. summary below One of the biggest frustrations to machine builders is. where they have conscientiously had all of the various. CONDUCTED IMMUNITY DRFI J1113 3 This test is components in a system tested prior to complete. seeing less and less use Those companies still using machine testing and watched the machine fail miserably. J1113 3 tend to use the Suggested Test Severity Levels They then start looking at all of the test reports on the. contained in Appendix B A few limit this test to 200 MHz components and try to determine who did not pass the. max component test They all did What now,CONDUCTED IMMUNITY BCI J1113 4 Almost without. exception companies using this test use the The problem can come from several areas The most. recommended performance levels in Appendix A and common cause is that the wiring harness as installed has. over the frequency range of 1 to 400 MHz The only become a tuned antenna and is injecting significantly. exceptions are the companies that also use J1113 3 up more EMI RFI into one or more of the components The. to 200 MHz use 4 for 200 MHz to 400 MHz The other second most common is one of the sensors attached to. exception is in rare instances a company may specify the system is acting as a receiver and sending erroneous. this test to 500 MHz The rarest of all exceptions is the signals to the system Ground loops that create. one company that specified Region I to 100 mA 4 current voltage paths that cause inductive transfer to the. recommends 60 mA for Class C and 125 mA for Region sensor wiring bad ground connections acting as detector. II 4 recommends 80 mA for Class C Needless to say diodes and changing the EMI RFI into low frequency. the testing component and design costs are significantly signals that the system assumes are commands and. higher inductive cross talk between power cables and signal. RADIATED IMMUNITY ALC J 1113 21 With very few cables are also common The serial data transmitted. exceptions manufacturers list 100 V M as Region II between modules may be corrupted by interference. The function may deviate from design but will return to pulses or bad wiring This is why CAN such as SAE J. normal after the disturbance is removed This is what is 1939 is used in place of sensitive data communication. finally tested There have been discussions and some methods such as RS 232. bid specifications with the power at 150 V M and in one. case 200 V M The only case that I am aware of that the Good installation techniques along with testing using the. final order was 200 V M the Acceptance Criteria was intended wiring harnesses will reduce the incidences of. Region III The function may deviate from design during failure when testing the complete system. SAE J 1113 21 22 23 25 26 and 27 cover Radiated Immunity to EMI RFI SAE J 1131 21 covers the Compatibility Measurement Procedure for 10 kHz to 18 GHz when tested in Absorber Lined Chamber ALC This procedure is designed to simulate open field testing The test room is shielded room the has at least the four

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