ISO 10605 Auto ESD Overview - Requirements, Setup, & Networks
- EMC Interference Blog
- 27 Dec, 2019
ISO 10605 Automotive ESD Testing
Overview ISO 10605
ISO 10605 is an automotive-based standard that sets forth electrostatic discharge immunity requirements to evaluate electronic modules intended for use with road vehicles. This standard is currently in its second addition published in 2008. It covers:
- ESD in Assembly
- ESD Caused by Service Staff
- ESD Caused by Passengers(1)
This standard, as opposed to the more common commercial EN/IEC 61000-4-2 series of standards requires air discharges upwards of 25kV and contact discharges of 15kV. It also requires different resistance and capacitance network configurations ensuring waveform conformity. Below you will find a chart from Texas Instruments "Application Report ISO 10605" showing the different requirements side by side.
This automotive standards specifically states "This International Standard is based in part on IEC 61000-4-2 and describes vehicle-specific requirements." Another important consideration is the application of this ISO standard to all road vehicles regardless of propulsion system. It also references both ISO 7637-1 and ISO 11452-1 automotive based standards.
EN / IEC 61000-4-2 & ISO 10605
These setups can be compared based up on the individual application, of which there are several setups within the automotive ISO standard. This comparison is acting as a brief overview. For specifics and other testing considerations reference the corresponding standard.
ESD Table - Both standards require all wood tables and ISO 10605 requires the table be between .7 meter and 1 meters tall. This range falls under the guidelines of IEC 61000-4-2, which specifies a .8 meter tall table. This allows for the same table to be used for both setups, given proper planning and consideration. We have another article titled EN/IEC 61000-4-2 Setup - Save Hundreds (Step-by-Step Guide/DIY) detailing how to make a table to ensure it meets electrostatic discharge requirements.
Grounding/Bleed Off Cords/Resistors - Referencing 9.3.2 Test set-up, it requires a safety ground connection (Item #7 of figure 6). Reference (figures 4 and 5) for powered up testing. Given the safety considerations, it is advisable that the resistors be able to withstand ESD occurrences and high voltage wire be used. This same cord and resistor setup can be seen in the commercial standard in figure 5. This allows for the same wires and grounding cords to be used for both.
Ground Reference Plane - The most direct mention of this portion of the setup in ISO 10605 "ground reference plane (GRP), which is placed under the non-conductive table, shall be metallic sheets (e.g. copper, brass or aluminium) and a minimum thickness of 0.25 mm". This meets the requirements of IEC 61000-4-2. Given that the commercial standard has more requirements on the majority of these components, it is ideal to use it as a baseline.
Different Setup Considerations
Field Coupling Plane - ISO 10605 has a unique and specific test setup for power on testing, Figure F.1 — ESD Powered-up test — Bench top set-up provides guidance on how to make this setup. There is no mention of a field coupling plane in IEC 61000-4-2 and this is unique to the automotive ESD standard. An important note when looking at this part of the setup, is that it is required to be made out of copper or brass.
The diagram above is a exert form ISO 10605:2008 showing the layout of the field coupling plane. Figure F.1 provides exact details on the setup, including metals allowed, thickness, and thickness of insulation. When looking to begin work on a particular setup, be sure to reference the standard and have a third party review prior to use.
Vertical Coupling Plane (VCP) - IEC 61000-4-2 requires a metal coupling plane presented vertical with a stand to be compliant. ISO 10605 does not mention this criteria and all diagrams reflect this. This eliminates the need for an additional piece of metal being cut. When looking at the exact construction of the VCP reference the IEC standard to ensure conformity.
1) ISO Website - Purchase/Preview Standard
2)Texas Instruments - Application Note ISO 10605