I have a system that is using the ADE7816. The system is worknig and measuring power, power-factor, etc, just fine. I recently took the design to get FCC certified and failed the conducted emissions test.
So I am trying to figure out what my culprit is that is causing this noise. I isolated my power supply and by itself it would pass the testing. But as soon as I make R1 more than about 1k the system can not measure properly. If I make R1 about 1Meg then I can pass testing but the ADE7816 can not measure power correctly anymore.
I have been experimenting with power line filtering between the input and the power supply with mixed results. I am wondering if AD has any recommendation for connecting the ADE7816 to DC-gnd or if there is a filter configuration that can help me pass FCC conducted emissions testing.
Please review this sketch and let me know what should change.