[rabbit73]

I understand your point, but when making a diagnosis you must be careful not to make any conclusions about what it couldn't or could be without further confirmation from additional tests.

Sherlock Holmes quote

"You will not apply my precept," he said, shaking his head. "How often have I said to you that when you have eliminated the impossible, whatever remains, however improbable, must be the truth? We know that he did not come through the door, the window, or the chimney. We also know that he could not have been concealed in the room, as there is no concealment possible. When, then, did he come?"
The Sign of the Four, ch. 6 (1890)
Sherlock Holmes in The Sign of the Four (Doubleday p. 111)

"EMI/RFI noise filtering: Up to 43 dB"
To me, Up to means as much as, but at what frequencies? Is it effective at the frequencies you need? I don't see them providing a chart that shows attenuation vs frequency. It might very well be effective at the frequencies you need, but the EMI could be coming in another way.