[Sub]

Hi, can someone describe an EMI finger for me?

Many apologies if this is in the wrong forum.

[ghporter]

The little metal tabs that provide good electrical connections between outside panels and the main enclosure of a device are called "EMI fingers."

[centerchannel68]

What an informative thread.

[analogika]

Originally Posted by centerchannel68 

What an informative thread.

Question - answer - asshole - flamewar.

Standard 'nn thread structure.

What the **** did you expect.

[ghporter]

Originally Posted by centerchannel68 

What an informative thread.

It's an area that applies to a lot of different types of technology, including computers. Did you learn something from this thread?

[Sub]

I did, thanks.

[dcmacdaddy]

Originally Posted by ghporter 

The little metal tabs that provide good electrical connections between outside panels and the main enclosure of a device are called "EMI fingers."

Is this used for grounding purposes? to make sure the various parts of a device are all connected to the same ground?

I remember seeing something very similar to these all over the beige G3 Mac series, especially the 7500 and 7600 lines. They were on the front of the inner housing as well as the inside of the cover/top. There is nothing similar looking on today's G5 towers. If these things are for grounding purposes how is that achieved? (Is it the fact there is an all-metal body that keeps the unit electrically connected within need for these "fingers".)


And yes, I too learned something from this thread. Thanks, Glenn.

[G4ME]

Faraday cage - Wikipedia, the free encyclopedia
^^ are used to reduce
Electromagnetic interference - Wikipedia, the free encyclopedia
^^^ these

same reason powersupplies come in their own boxes, cause the high frequency switching messes up with other components in the computer.


and cash, nice response

[ghporter]

Originally Posted by G4ME 

Faraday cage - Wikipedia, the free encyclopedia
^^ are used to reduce
Electromagnetic interference - Wikipedia, the free encyclopedia
^^^ these

same reason powersupplies come in their own boxes, cause the high frequency switching messes up with other components in the computer.


and cash, nice response

I like THIS response a whole lot. I answered a simple "what is it" question. You answered a "what does it do and why" question. Very nice.

[alligator]

Do they act at all like a Faraday cage (or extend the basic cage of the case)? Or is it just for an electrical connection between cases?

[analogika]

Originally Posted by alligator 

Do they act at all like a Faraday cage (or extend the basic cage of the case)? Or is it just for an electrical connection between cases?

Those are basically the same question.

[centerchannel68]

Originally Posted by analogika 

Question - answer - asshole - flamewar.

Standard 'nn thread structure.

What the **** did you expect.

Uh.... okay? I said what an informative thread because it was a simple question, then an answer that fulfilled the question, right away. I hate to break it to you, but you're being the asshole, so I reported you.

[centerchannel68]

Originally Posted by ghporter 

It's an area that applies to a lot of different types of technology, including computers. Did you learn something from this thread?

Yeah, I just thought it was odd to see a question answered so quickly and directly. It's a shame Analogika had to come in here and **** all over the place.

[analogika]

Your wording and your posting history made it fairly obvious that you were being sarcastic.

Your post in the "drifting" car steering thread ("....wow") was also just amazement at how quickly and completely the original poster's question was answered, right?

Yeah.

[centerchannel68]

I wasn't being sarcastic. If I was being sarcastic, my comment would have been placed in a NON informative thread. Keep it up. Reported again for baiting.

[Demonhood]

how bout you two go out back and have a drink. that way you'll stop derailing this thread and we can all talk about you behind your backs.

[analogika]

Demonhood: Reported for derailing the thread.

[Yam69]

I came here looking to find out what an EMI finger is, and I also learn what an asshole is.

I love the 'net.

[turtle777]

Originally Posted by Yam69 

I came here looking to find out what an EMI finger is, and I also learn what an asshole is.

I love the 'net.

Actually, you learned what a BANNINATED asshole is

-t

[Doofy]

Originally Posted by Yam69 

I came here looking to find out what an EMI finger is, and I also learn what an asshole is.

Someone who doesn't read the rules about digging up old threads?

[ghporter]

I generally give noobs one freebie in the "not having read the rules" category. Yam69, if you didn't get the info you needed from my first post in this thread, obviously reading the rest of it wouldn't have been any more informative. Like all groups, we have all kinds. Some of our users just don't cooperate or mature, and their behavior is not what we'd like. They get banned for that sort of thing.

But we DO have a rule about dredging up threads that haven't been active for more than six months-unless one is adding real content, we require that users start a new thread. This keeps us from having all sorts of confusion crop up because old posts are along side new ones-and there is only the one, rather small, indication of when a post was made to help a user figure things out.

[analogika]

This thread is LESS than six months old.

[Doofy]

Originally Posted by analogika 

This thread is LESS than six months old.

So it is.

/walks off muttering something under breath about bleedin' pedantic Germans.

[analogika]

I only used the smiley because there's no "wag finger" image in MacNN's repository.

[ghporter]

Late February to early August...163 days to be precise. But honestly, this tiny little thread was older than its age implies...

[design219]

Originally Posted by ghporter 

The little metal tabs that provide good electrical connections between outside panels and the main enclosure of a device are called "EMI fingers."

This is actually interesting. I have often seen these when upgrading ram or cards, but never knew they had an electrical function. How does this benefit with a case made of plastic?

And EMI stands for? ... Electrical ? ?

[ghporter]

ElectroMagnetic Interference. The "fingers" act to complete an electrical connection between the moving part and the fixed part, forming a closed Faraday shield (in properly designed devices) that blocks electromagnetic radiation-in both directions. Those "plastic" cases are plated/sprayed with a conductive coating to block EM radiation.