common-mode noise artifacts and the Y elements go between the power lines
and earth ground filtering the differential noise artifacts.
Regulatory approval bodies check for both radiated and conducted noise
during their certification testing. Radiated noise is checked by locating a cali-
brated antenna and receiver at a specified distance (1 meter) from the product
and plotting the resulting spectrum well into the GHz region. Radiated noise
causes interference with other equipment, but conducted noise uses the power
and I/O lines to radiate its noise and therefore is also checked. Conducted noise
is checked ...
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