Wrote this in response to question about using EMI blocking materials: nice so copied it for here: - Elizabeth - Tweakers' Asylum

Tweakers' Asylum

Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ.

Wrote this in response to question about using EMI blocking materials: nice so copied it for here:

In response to a question about how to place EMI RFI blocking materials on another site:
I wrote,
""First thing pops to mind is getting an RFI EMI detector.
I have a nice one "non contact voltage detector" GreenLee GT-16 from Amazon cost is $22 or so.
It can detect the RFI mainly from AC cables and wall outlets. Digital connections.. But also can beep at any AC type radiation, music signals leaking out of cables too, and small panel displays.
You can find where all the bad stuff is leaking out. Really! And you can find out if your shelves already block it, or, allow it to spread! (some stuff just lets it move around. The source fills up the whatever you are using to block it..then when that is filled up (because you did not ground it.. yes to AC wall ground.) THAT starts being a radiant source of EMI RFI.
REALLY!
The GreenLee is a nice design. I bought others which just no way as nice.
Worth the $22 to play with.
Got me to start using small baggies of coated quartz crystals (they STOP the RFI in its tracks without having to be grounded. The quartz turns the RFI into heat/vibration. (if treated with a non-conductive grease, and pressed flat so no air gaps. Work great on AC plugs..)

With the non contact AC voltage detector... you can FIND the big culprits. Instead of just guessing.

My worst offender was my tubed VAC Standard (separate) power supply umbilical. I had to wrap it with conductive foam them ground the foam to the AC wall ground. Very effective.
I think it was so bad due to the tube supply voltages in the unshielded umbilical) ""

Enjoy.

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Topic - Wrote this in response to question about using EMI blocking materials: nice so copied it for here: - Elizabeth 09:48:22 03/03/14 (10)

RE: Wrote this in response to question about using EMI blocking materials: nice so copied it for here: - Bigcat 13:04:38 03/07/14 (1)

Pemro. I bought the sheets i used at Pemro (took forever, 3 months) - Elizabeth 10:04:24 03/09/14 (0)

Handy for determining if a wire or outlet is live. - Tweekeng 18:10:45 03/03/14 (6)

RE: Handy for determining if a wire or outlet is live. - Duster 15:12:09 03/04/14 (3)

I remember a guy with two big screwdrivers stuck in outlet. then he crossed them wit ha third one. - Elizabeth 09:57:06 03/05/14 (2)

RE: I remember a guy with two big screwdrivers stuck in outlet. then he crossed them wit ha third one. - Cameraman 05:03:26 03/07/14 (0)

RE: I remember a guy with two big screwdrivers stuck in outlet. then he crossed them wit ha third one. - 6bq5 15:35:32 03/05/14 (0)

So what? it is a start. and better than nothing to find out. nt - Elizabeth 21:45:17 03/03/14 (1)

An ordinary AM radio works to detect RFI,.. - Lew 16:07:09 03/05/14 (0)

Excellent tool - mcondo 10:19:15 03/03/14 (0)

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