Grounding or Earthing — Lesson 2

This lesson covers the principles of grounding or earthing in Electromagnetic Compatibility (EMC). It explains the concepts of single point grounding and multi point grounding, and the segregation of grounds. The lesson also discusses the role of grounding in shielding cables and reducing radiated susceptibility. It further illustrates the importance of thoughtful application of grounding principles to avoid EMC problems. For instance, it explains how common impedance coupling can be avoided by rearranging connections to the ground.

Video Highlights

00:13 - What is grounding?
03:59 - Single point grounding
08:11 - Multipoint grounding
11:04 - Role of ground in shielded cables
16:12 - Cable shields and grounding
22:03 - Potential problem with grounding

Key Takeaways

- Grounding or earthing is a crucial concept in EMC, with variations like single point grounding, multi point grounding, and segregation of grounds.
- Single point grounding can prevent common impedance coupling but may not be suitable for higher frequencies due to potential radiation issues.
- Multi point grounding can avoid radiated interference problems and is suitable for high-frequency grounding.
- Segregation of grounds involves separating signal grounds, noisy grounds, and hardware grounds to prevent interference.
- Shielding cables can prevent radiated emission from cables and reduce radiated susceptibility.
- Thoughtful application of grounding principles is necessary to avoid exacerbating EMC problems.