Does Aluminim provide EMI shielding?

deeznuts · 05-13-2002, 01:48 PM

Title says it all. i got rid of my eheim, and am going for a cheaper smaller pump. i am running P4, so pump dying is not too much of an inconvenience. but i am worried about EMI. i am putting it in an aluminum res, the one from dtek. was wondering if this will sheild the EMI, as i am putting it on top of my case, about 1' from my monitor.

bigben2k · 05-13-2002, 03:30 PM

No, Aluminium does not shield EMI, but copper will!

pompoen · 05-13-2002, 03:33 PM

and an steal case will do to

deeznuts · 05-13-2002, 03:55 PM

damn, for real? my case is alu too. well, we'll see. might have to move the case now.

pompoen · 05-13-2002, 04:14 PM

you could put metal plates around the reservoir

deeznuts · 05-13-2002, 05:30 PM

ok, once and for all, what kind of metal will prevent it? i hear copper. what else? steel? something cheap that i can put in on the side of the monitor, if needed.

ECUPirate · 05-13-2002, 11:18 PM

what about an aluminim, steal, & coppur aloy?

....the spelling police...

bigben2k · 05-14-2002, 08:22 AM

How about a copper mesh? (That's what they use at embassies).

whatever you use, make sure it's grounded.

Dix Dogfight · 05-14-2002, 03:02 PM

NO copper will NOT, reduce any magnetic field you might have a problem with.
Please read these threads on the subject:

http://forums.procooling.com/vbb/sho...?threadid=2632

http://forums.procooling.com/vbb/sho...p?threadid=632

Or take the crash course presented here:
Iron or nickel will reduce your magnetic field.
All other metals are close to worthless in this aspect.
(there exists some special alloys of course but they are not for the average watercooler).

bigben2k · 05-14-2002, 03:57 PM

You may be right, but it depends on the frequency of the signal you're trying to block.

In this case, a 60 Hz signal (now that I think about it!), so no, I don't believe that copper would be very effective.

A steel enclosure would probably work, as long as it's wrapped tight.

So now, what's so special about the Eheim? Does anyone know how they're shielded? Is it just the design of the coils?

FRAGN'STIEN · 05-14-2002, 11:02 PM

My Eheim seems to be causing some problems but only on bootup which seems really strange.

DigitalChaos · 05-15-2002, 12:20 AM

what is the radiation that your processor emits? (the stuff that is unhealthy)

i just wanna know if my copper water block is stopping it, or should i not put that window in my case =)

bigben2k · 05-15-2002, 07:32 AM

Quote:

Originally posted by FRAGN'STIEN
My Eheim seems to be causing some problems but only on bootup which seems really strange.

That would be normal.

Most electric motors require a larger current than in normal operation, just to get started (i.e. break the inertia).

nuclear · 05-15-2002, 03:29 PM

dix dogfight
there would also be cobalt. With iron and nickel, they are the only 3 base metals that will magnetise and also block emi.
there would be also some rare earth metal, but the cost will completly prohibit it.
copper mesh or steel mesh around the pump should solve the problem.

bigben2k · 05-15-2002, 03:40 PM

Ah ben, de la visite!

I thought copper mesh would do, but it is mostly used to block high frequencies, not low frequencies, like the 60 Hz from da wall...

Steel, nickel or cobalt (not cobalt of course!). Nickel is too expensive, so a steel box will do.

nuclear · 05-15-2002, 03:43 PM

why not cobalt big ben 2k

Dix Dogfight · 05-15-2002, 05:16 PM

Well nuclear
You are correct about Cobalt. But building a simple shield for a pump at home hardly requires such a exclusive material when normal iron/steel does the job just as good/well.

And NO. Copper does not perform well when i comes to shielding low freqency magnetic interferance.
If you don't believe me just take a look in a handbook for engineering and notice the difference between ferromagnetic materials (Iron,Nicel,Cobalt) and nomal metals like ALU,Copper,etc.
The number to look for is called:
RELATIVE PERMEABILITY
The higher the better. Vaccum or air has the relative permeability=1.
And ferrous materials have a much higher number.
If i don't remember incorrectly coppers permeability is very close to 1 and therefore worthless as magnetic insulator.

bigben2k · 05-16-2002, 07:51 AM

Cobalt has this nasty chemical property in that it is RADIOACTIVE!!!

05-13-2002, 01:48 PM	#1
deeznuts Cooling Savant Join Date: Nov 2001 Location: san diego Posts: 142	Does Aluminim provide EMI shielding? Title says it all. i got rid of my eheim, and am going for a cheaper smaller pump. i am running P4, so pump dying is not too much of an inconvenience. but i am worried about EMI. i am putting it in an aluminum res, the one from dtek. was wondering if this will sheild the EMI, as i am putting it on top of my case, about 1' from my monitor.

05-13-2002, 03:30 PM	#2
bigben2k Responsible for 2% of all the posts here. Join Date: May 2002 Location: Texas, U.S.A. Posts: 8,302	No, Aluminium does not shield EMI, but copper will! __________________ WBTA (Water Block Testing Alliance) Nordic Hardware WC 101

05-13-2002, 11:18 PM	#7
ECUPirate Hottest Stank of them All Join Date: Mar 2002 Location: Washington, DC area Posts: 533	what about an aluminim, steal, & coppur aloy? ....the spelling police... __________________ Does a radioactive cat have 18 half lifes? --Kenny my pimpin' rig: ...previously poorly cooled... 486DX-2 66mhz @ 75mhz, 4Mb ram, shared, 256Mb hard drive Onboard VGA, watercooled, of course 16-color monitor, labtec speakers, 28kbs USRobotics modem Windows XP (think about it) Maze 3, DDen GF3 block, Eheim 1250, econoline van HC, 1/2" hose w/ 5/8" fittings Comair 172mm fan

05-14-2002, 08:22 AM	#8
bigben2k Responsible for 2% of all the posts here. Join Date: May 2002 Location: Texas, U.S.A. Posts: 8,302	How about a copper mesh? (That's what they use at embassies). whatever you use, make sure it's grounded. __________________ WBTA (Water Block Testing Alliance) Nordic Hardware WC 101

05-14-2002, 03:02 PM	#9
Dix Dogfight Cooling Savant Join Date: Aug 2001 Location: Stockholm Sweden Posts: 128	NO copper will NOT, reduce any magnetic field you might have a problem with. Please read these threads on the subject: http://forums.procooling.com/vbb/sho...?threadid=2632 http://forums.procooling.com/vbb/sho...p?threadid=632 Or take the crash course presented here: Iron or nickel will reduce your magnetic field. All other metals are close to worthless in this aspect. (there exists some special alloys of course but they are not for the average watercooler). __________________ If it ain't broke, fix it. Setup: Dual Duron 1100 \| Voodoo 3 2000 \| Addtronics W8500(WTX) \| Eheim 1250 \| Car radiator \| 2 Innovatech WB \|

05-13-2002, 03:33 PM	#3
pompoen Cooling Neophyte Join Date: Mar 2002 Location: belgium Posts: 41	and an steal case will do to

05-13-2002, 03:55 PM	#4
deeznuts Cooling Savant Join Date: Nov 2001 Location: san diego Posts: 142	damn, for real? my case is alu too. well, we'll see. might have to move the case now.

05-13-2002, 04:14 PM	#5
pompoen Cooling Neophyte Join Date: Mar 2002 Location: belgium Posts: 41	you could put metal plates around the reservoir

05-13-2002, 05:30 PM	#6
deeznuts Cooling Savant Join Date: Nov 2001 Location: san diego Posts: 142	ok, once and for all, what kind of metal will prevent it? i hear copper. what else? steel? something cheap that i can put in on the side of the monitor, if needed.

05-14-2002, 03:57 PM	#10
bigben2k Responsible for 2% of all the posts here. Join Date: May 2002 Location: Texas, U.S.A. Posts: 8,302	You may be right, but it depends on the frequency of the signal you're trying to block. In this case, a 60 Hz signal (now that I think about it!), so no, I don't believe that copper would be very effective. A steel enclosure would probably work, as long as it's wrapped tight. So now, what's so special about the Eheim? Does anyone know how they're shielded? Is it just the design of the coils? __________________ WBTA (Water Block Testing Alliance) Nordic Hardware WC 101

05-14-2002, 11:02 PM	#11
FRAGN'STIEN Cooling Savant Join Date: May 2002 Location: Rathdrum, ID Posts: 380	My Eheim seems to be causing some problems but only on bootup which seems really strange. __________________ This space for rent

05-15-2002, 12:20 AM	#12
DigitalChaos Cooling Savant Join Date: Jan 2002 Location: Waukesha, Wi Posts: 698	what is the radiation that your processor emits? (the stuff that is unhealthy) i just wanna know if my copper water block is stopping it, or should i not put that window in my case =)

05-15-2002, 03:29 PM	#14
nuclear Cooling Neophyte Join Date: Mar 2002 Location: Quebec Posts: 46	dix dogfight there would also be cobalt. With iron and nickel, they are the only 3 base metals that will magnetise and also block emi. there would be also some rare earth metal, but the cost will completly prohibit it. copper mesh or steel mesh around the pump should solve the problem.

05-15-2002, 03:40 PM	#15
bigben2k Responsible for 2% of all the posts here. Join Date: May 2002 Location: Texas, U.S.A. Posts: 8,302	Ah ben, de la visite! I thought copper mesh would do, but it is mostly used to block high frequencies, not low frequencies, like the 60 Hz from da wall... Steel, nickel or cobalt (not cobalt of course!). Nickel is too expensive, so a steel box will do. __________________ WBTA (Water Block Testing Alliance) Nordic Hardware WC 101

05-15-2002, 03:43 PM	#16
nuclear Cooling Neophyte Join Date: Mar 2002 Location: Quebec Posts: 46	why not cobalt big ben 2k

05-15-2002, 05:16 PM	#17
Dix Dogfight Cooling Savant Join Date: Aug 2001 Location: Stockholm Sweden Posts: 128	Well nuclear You are correct about Cobalt. But building a simple shield for a pump at home hardly requires such a exclusive material when normal iron/steel does the job just as good/well. And NO. Copper does not perform well when i comes to shielding low freqency magnetic interferance. If you don't believe me just take a look in a handbook for engineering and notice the difference between ferromagnetic materials (Iron,Nicel,Cobalt) and nomal metals like ALU,Copper,etc. The number to look for is called: RELATIVE PERMEABILITY The higher the better. Vaccum or air has the relative permeability=1. And ferrous materials have a much higher number. If i don't remember incorrectly coppers permeability is very close to 1 and therefore worthless as magnetic insulator. __________________ If it ain't broke, fix it. Setup: Dual Duron 1100 \| Voodoo 3 2000 \| Addtronics W8500(WTX) \| Eheim 1250 \| Car radiator \| 2 Innovatech WB \|

05-16-2002, 07:51 AM	#18
bigben2k Responsible for 2% of all the posts here. Join Date: May 2002 Location: Texas, U.S.A. Posts: 8,302	Cobalt has this nasty chemical property in that it is RADIOACTIVE!!! __________________ WBTA (Water Block Testing Alliance) Nordic Hardware WC 101

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)