×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Radiated EMC test with chassis earthed or chassis floating?

Radiated EMC test with chassis earthed or chassis floating?

Radiated EMC test with chassis earthed or chassis floating?

(OP)
Supposing we take the following set-up to a Radiated EMC test chamber (30MHz – 1GHz)…

We have a 12V battery in a totally enclosed metal enclosure X. A cable from this battery leaves this enclosure and feeds into another metal enclosure, Y, which is semi open, since its front panel is absent.
Enclosure Y contains a 10W buck converter battery charger, which charges a battery also in the same enclosure Y.

Which would give the best radiated EMC performance?.(least radiated emissions)....

1…Doing the radiated EMC test with Enclosure X’s chassis connected to earth ground, and enclosure Y’s chassis connected to Enclosure X’s chassis?
2….Doing the radiated EMC test with both chassis’s floating (not connected to earth ground)?

RE: Radiated EMC test with chassis earthed or chassis floating?

The answers is "it depends..."

If Enclosure A is 'totally enclosed', how do the wires exit? Via filter caps? A shielded cable? If neither of those your cabling is probably going to be a strong antenna that will swamp any other issues. With proper filtering on the PCBAs or maybe the cables you might get lucky.

If your cable is shielded and properly tied to Enclosure Y then you could have a nice Faraday Cage that only has an opening for EMC at the absent front panel. 'Properly tied together' means 1 or 2 won't matter.

This is my go-to literature if you want to learn more about this - https://www.emiguru.com/books/edn-designers-guide-...

Z

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


Resources

Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now
The Great Project Profitability Debate
A/E firms have a great opportunity to lead the world into the future, but the industry’s greatest asset—real-time data—is sitting wasted in clunky, archaic ERP platforms. Learn how real-time, fully interactive dashboards in a modern ERP allow you to unlock data that will shape the future of the world. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close