See: Manual, PCE-DC 3 Current detector
http://www.industrial-needs.com/manual/manual-clamp-meter-pce-cd3.pdf Current sensor: Hall effect sensor type You have to select AC or DC. I doubt it does both simultaneously. Although if someone managed to run both, I do not see why the voltmeter would not catch this. I am certain that an expensive industrial watt meter will catch this or any other waveform. That's what a watt meter is for: catching errors and problems with electricity, to prevent equipment damage, fires and electrocution. - Jed
