I am using Picoscope 220.127.116.11 & 3224 hardware to capture turnoff waveforms, using both simple edge & advanced edge with hysterisis to trigger off the digital control signal rising edge of ch1, I also get triggers when the other channel 2 rising edge coincides (within nom. 300uS window) with the digital signal falling edge. So its capturing some turnons as well.
Ch2 is a current measurement across 1 ohm of a nominal 280mA load (250mA resistive, 29mA LED PFC Lamp operating off 110V 50hz AC.
The 110V supply is transformer isolated , the Logic board is Earthed & the Laptop is running off battery so there are no ground loops to interfere.
I dont miss any turnoffs, just get additional unwanted waveforms in the buffer (for later analysis & evidence)
Sample PSData file attached...
(PS: add file error "The extension psdata is not allowed.", I'll try zipping it up)