Texas Instruments TIDA-010046, Руководство по конструкции, Страница: 35 / 42

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35 TIDUES1A – October 2019 – Revised February 2020
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EMC Compliant 10/100-Mbps Ethernet PHY Reference Design With IEEE
802.3at Type-1 ( ≤ 12.95 W) PoE-PD
To evaluate the radiated emissions of the DUT, ambient EM levels at the test site first must be
determined. The ideal situation is for all of the ambient signals to be below the measurement limit line. So
these signals should be measured with the DUT turned off. The ambient signals were found at least 25 dB
below the limits throughout the measurement frequency band for both polarizations as
Figure 34 shows.
Figure 34. Ambient Scan