Originally posted by Lattice333
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By chance have you inserted another mA meter in series with the PSU?
The last video I tried to get on YT (it would never be accepted for public for some reason) showed variations between three PSU's and two secondary meters in series.
81mW is great, without doubt. Maybe stick a carbon 1 ohm in series with the ground lead and look across it with your scope. The waveform should not be to bad and a rough mental integration can be done. I suspect you are seeing a large energy spike back into the PSU (coherence).
Thanks.
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