SAE J1113-42

Description / Abstract: This SAE Standard defines a component-level test procedure to evaluate automotive electrical and electronic components for Conducted Emissions of transients, and for other electromagnetic disturbances, along battery feed (B+) or switched ignition inputs of a Device Under Test (DUT). Test apparatus specifications outlined in this procedure were developed for components installed in the 12-V passenger cars, light trucks, 12 V heavy-duty trucks, and vehicles with 24 V systems.

Measurement Philosophy

Various inductive loads installed in a vehicle could be a source of electromagnetic disturbances during switching and/or operating conditions. These disturbances, propagating in the vehicle's electrical system through the interconnecting wiring harness, could adversely affect the proper performance of the on-board electronics. In order to achieve Electromagnetic Compatibility (EMC) of the system, the characteristics of these disturbances should be analyzed. This procedure provides a uniform means for evaluating transients and other disturbances conducted from the DUT along its power supply lines. These tests are performed in a laboratory (bench test). A DUT which is considered to be a potential source of disturbances should be tested according to the procedure described in this document.

NOTE 1—While this procedure is aimed mainly at measuring transients of simple inductive devices (motors, solenoids, relays, etc.), it also applies to subsystems comprised of inductive devices combined with electronics and/or switches. When such a subsystem is fed with both direct feed power supply line and switched ignition power supply line, the test plan should specify where transients are to be measured, and whether these two power supply lines should be tied together for the test.

NOTE 2—This document is a part of the SAE J1113-XX series, EMC Measurement Procedures and Limits for Vehicle Components.

Rationale

SAE J1113-42 is cancelled in favor of using ISO 7637-2.