Re: [SI-LIST] : EMI due to fans (fwd)

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From: John Fisher (jmfisher@cisco.com)
Date: Thu Oct 12 2000 - 13:46:49 PDT


Sunil,

Be very careful of the placement of your probe cables,  noise can couple onto the cable shields and that may be negatively impacting your jitter numbers.  Try a different probe such as Doug Smith's passive differential coax probe.

John  Fisher


At 02:37 PM 10/12/00 -0400, you wrote:

Sunil,

I tend to agree with somebody here, who suggested your probe actually picks up noise. I don't see how EMI from fans can badly affect twinax cable, unless your Ground Connection is re-e-e-eally screwed up (and it takes some screw-up plus some ingenuity and luck....).

Mike.

George Borkowicz wrote:
 

One more per cent.  Try to replace the fans with a resistive load
 of the same power (bulbs, power resistors, what have you) right
at the fan end of the fan wires.

gjb
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