b4nt
Addicted to Fun and Learning
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@pma Anyway, this is now nicer so, and much more close to @audio2design expectations. Using 90°, the mains input current of that DUT PSU was definitively different. Did the DUT fail? No.
And anyone shall know that the real life problems will arise connecting together several boxes, which each individually succeeded in lab tests. A known issue of EMI compability. In our setups, first problem could be caused by a PC, as a source, and a USB port; I wouldn't fix that with a mains conditionner; many fix that using Toslink.
And anyone shall know that the real life problems will arise connecting together several boxes, which each individually succeeded in lab tests. A known issue of EMI compability. In our setups, first problem could be caused by a PC, as a source, and a USB port; I wouldn't fix that with a mains conditionner; many fix that using Toslink.
Man, I was hoping to get more work done but seems this is the fastest path to stop the theorizing. So I set everything back up and set the dimmer emulation to 90 degrees. Here is the AC waveform coming out BK Precision 9801 now:
View attachment 147077
Distortion has now risen massively from 18% to 54%. Noting about the AC waveform looks like a sine wave. Further, RMS voltage has sunk down to 84.6 volt.
Here is our Topping A90 again *with mains AC power first*:
View attachment 147078
This is what it looks like when fed with the dimmer emulation at 90 degrees:
View attachment 147079
Nothing has changed whatsoever. Not even a hint.
As it should be. As I explained already.
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