EM Test ISO Automotive Rack

ISO 7637 is an automotive EMC test standard that outlines testing requirements for simulating electrical transients in road vehicles with 12V or 24 V electrical systems. ATEC carries EMC test equipment designed to meet the test specifications of ISO 7637-2, the latest version of the standard. Read on for more information about ISO 7637, applicable test pulses, and recommended ISO 7637 test equipment. What is ISO 7637? ISO 7637 defines test parameters for the EMC testing of road vehicles, specifically the simulation of electrical disturbances, or transients, in vehicle power supply lines. The standard, which covers both susceptibility and emissions testing, defines proper waveforms for test pulses and lists necessary electrical components. ISO 7637 also offers performance classifications for test pulses based on their frequency, strength, and burst cycle; ratings vary between pulses, and for the 12V or 24V electrical systems of commercial vehicles. Automotive manufacturers across the world rely on ISO 7637 to ensure the electromagnetic compatibility of their electrical systems; it is a common requirement for vehicle component development. Discovering a vulnerability to transients early on in automotive design is essential, as failures during formal EMC testing waste companies’ time and money. ISO 7637 is designed to protect car electronics that are vulnerable to surges from automotive power supplies. Since the advent of EMC testing, manufacturers have developed their own EMC standards in response to the myriad of electrical disturbances to which road vehicles fall victim. ISO, the International Organization for Standardization, developed ISO 7637 as a universal standard that covers as many varieties of automotive transients as possible.   ISO 7637 Subsections ISO 7637 is composed of five parts: ISO 7637-1 Definitions and general considerations ISO 7637-2 Electrical transient conduction along supply lines

The purpose of ISO 7637-2 is to ensure electromagnetic compatibility of passenger and commercial vehicles operating on 12V or 24V electrical systems. ISO 7637-2 requires multiple conducted transients to be coupled onto DC lines to test the compatibility of vehicles. This standard is applicable to both internal combustion engine and electric motor vehicles.   Equipment Required: Transient Generator - HILO CAR TEST 14 Oscilloscope - Tektronix MDO4104C Differential Probe - Probe Master 4234 ISO 7637-2 Test Pulses The following tables show data that highlights Pulse 1, Pulse 2a, Pulse 2b, Pulse 3a, and Pulse 3b. Pulse 1 ISO 7637-2 Pulse 1 is used to simulate the transients created in the case that a motor, or inductive load, is disconnected from the circuit.    Parameters of this pulse can be verified using an oscilloscope and differential probe to meet the specifications below. Pulse 2a ISO 7637-2 Pulse 2a is used to simulate transients that occur when there is a current interruption on a device in parallel with the DUT and caused by the wiring harness inductance. Pulse 2b ISO 7637-2 Pulse 2b is used to simulate transients when a vehicle is turned off, but electric DC motors remain active and serve as a generator. Pulse 3a The pulse 3a is similar to an EFT pulse as seen in IEC 61000-4-4 (HYPERLINK THIS), this transient waveform is simulating switching occuring in a system connected by a wiring harness, in which the load is capacitive or inductive. Pulse 3b Similar to pulse 3a, except opposite polarity. Pulse 3b is another EFT waveform representing switching within a wire harness. These pulses also simulate the scenario in which a fuse is blown.   Pulse 4, 5a, & 5b ISO 7637 Pulse 4, Pulse 5a/5b were removed from the most recent revision of ISO 7637-2 and can be found now in ISO 16750-2.   ISO 7637-2 Test Equipment ATEC recommends the following products for testing

GM GMW3097 (General Specification for Electrical/Electronic Components and Subsystems, Electromagnetic Compatibility) specifies the EMC requirements for all automotive products when evaluated by specified test procedures. It refers to International EMC standards whenever possible, occasionally including internet test procedures when necessary. Validation testing in accordance with GM GMW3097 must be performed at a laboratory that has received recognition through the Automotive EMC Laboratory Recognition Program (AEMCLRP). For GM GMW3097, A minimum of two samples shall be tested. The supply voltage shall be 13.5 (+0.5/-1) V unless otherwise stated in the test plan. The DUT (Device Under Test) shall pass both the component level tests according to this specification and the vehicle level tests according to GMW3091. Component tests are not intended to take the place of vehicle tests. The exact correlation between component and vehicle test performance is dependent on component mounting location, harness length, routing, and grounding, as well as the antenna system. Component testing, however, permits components to be evaluated before actual vehicle availability. Before testing, any deviations from the requirements and/or test procedures shall have been agreed with the GM EMC Engineer responsible for approving the test plan. Such deviations shall be detailed in the approved test plan and on component drawings, test certificates, reports, etc. Note: All EMC test results that are intended for validation purposes must be accompanied by a GMW3103 EMC Test Plan (complete with an approval number supplied by the GM EMC Engineer or by the CEMENT database process). Note: Any EMC development test results that are provided to GM (e.g., test results that have been taken before the EMC test plan approval, or results of limited testing due to root cause analysis or Pre-DV evaluation work) must be marked “Development Data – Not For

FMC1278 CI 280 replaces EMC-CS-2009.1, both referring to ISO 10605 for the ESD testing portion. FMV1278 is applicable for all 12 and 124 volt DC electrical and electronic components/subsystems that are planned for use on 2020 Ford vehicle programs and beyond in addition to E/E component/subsystems whose commercial agreements are signed after July 1, 2015.  CI 280 Electrostatic Discharge is required in most components including all electronic modules (A, AS, AM, AX, AW), electric motors (EM), and other devices (D).  Differences from EMC-CS-2009.1: Concerning reporting, the laboratory may not use the terms pass or fail. They may only report Status I, II, or III. FMC will determine pass/fail based during their review of the formal test report.  Parametric testing no longer required immediately after testing. However, parametric testing is recommended after testing additional test samples.  ISO 10506 (2001) replaced by ISO 10605 (2008). Affects ESD simulator verification.  For handling tests, the DUT is placed on dielectric support vs a dissipative mat. 200 mm ground still required.  Figures updated to show that CAN wiring remains co-bundled with another wiring during powered ESD tests.  ESD stress levels now extended to +/= 15 kV for CAN circuits in the diagnostic connector.