OT: How do you measure common mode current?

Posted by Stephen Arnold on Oct 10, 2006; 5:27am
URL: http://elecraft.85.s1.nabble.com/More-information-Need-help-with-fluctuating-power-output-on-K2-tp386379p386381.html

Hello Elecrafters,

Somewhat off topic (I have built a K2/100, which works great!-) but I'm
sure that this group will know the answer.

Question: How do you go about detecting common mode current on the outside
braid of your co-axial cable and then measuring or quantifying the amount
thereof?

I've done some web surfing re this issue and it appears that for EMI
testing they use a wide band RF pickup of some sort and a sprectrum
analyzer. Given that I don't have a spectrum analyzer and that I'm not
concerned with laboratory accuracy is there a simple way of finding out
the level of common mode current floating on your coax?

Thanks in advance.

73, Steve
VK2SJA



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