EMC FLEX BLOG A site dedicated to Automotive EMC Testing for Electronic Modules

Validation Testing for Compliance to Automotive EMC Specs/Standards - EMC Test Plan

29. March 2020 05:35 by Christian in EMC/EMI, Load Simulator
A successful electronic module validation testing depends on:DUT Design Performance (60%).Load Simul

A successful electronic module validation testing depends on:


  1. DUT Design Performance (60%).
  2. Load Simulator & Support Equipment EMC compliance (20%). 
  3. EMC Test Plan (20%).

The Load Simulator must be CISPR-25, ISO 11452-2, and ISO 11452-4 compliant.

EMC Test Plan:

  • Select representative samples covering multiple vehicle platforms having design differences.
  • Select all applicable test methods except those that:
    • are not required for certain module category as outlined by OEM spec selection matrix.
    • are in conflict with design requirements imposed by Component Technical Specification (CTS).
  • Define for each DUT Type/Model:
    • Known sources of RF noise.
    • Functions Performance Classification.
    • Operating Modes per Test Method:
      • DUT Configuration:
        • Block Diagram including grounding scheme.
        • Connectors Pinout.
        • Test Harness Type & Mate Connectors:
          • standard 1.7 to maximum 2 m.
          • customized (inserted banana jacks & plugs @ 20cm from DUT  connectors).
          • ESD mate connectors with 2.5 solid core wire.
      • Activation Method:
        • Load Simulator HW/SW Configuration - Operating Manual.
        • Other DUT Support Equipment (e.g pneumatic activation).
        • Other DUT Support Software.
      • Monitoring Method:
        • DUT Test Points.
        • Load Simulator Test Points.
        • LS Configuration (e.g. switches, I/O lines). More details in LS Operating Manual.
      • How to evaluate a HW/SW Reset condition.
      • How to evaluate successful Self-Recovery.
      • Measurable Parameters & Tolerances:
        • Support Equipment:
          • Resolution (e.g. use oscilloscope vs DMM during voltage transients/dips/drops).
          • Fiber Optic (CAN, USB, E-Net, LVDS, etc). Must be 200 V/m compliant.
        • Support Software:
          • Configuration, data files format.
      • Differences between DUT Reset and Support Equipment Reset.
      • Pass/Fail Criteria per Test Point and DUT Function.
    • Reporting Data type and format (e.g. tables, plots, pics).
  • Negotiate EMC compliance deviations based on known DUT design limitations driven by cost/delivery.


Ground Return & Common Impedance Coupling

27. January 2020 09:26 by Christian in EMC/EMI, Load Simulator
Understanding the role of return ground is essential in EMC testing.Christian Rosu, Flexautomotive.n

Understanding the role of return ground is essential in EMC testing.


See Differential Mode vs Common Mode Current







Christian Rosu, Flexautomotive.net,  2020-01-27