I was investigating why TVS diode was getting damaged by looking in to the waveforms (voltage and current) across Z100. However when I connect a differential probe to the mains between L and N and an HV analog probe across Z100, there is no LED output. The moment I take out either the differential probe or the analog probe, I am getting output. Can anyone explain why this is happening? Circuit diagram is attached here.
Hi tepalia, Thank you for your reply. Could you please explain it a bit more? Because if I remove the differential probe from L and N and keep the analog probe across Z100 , I am getting LED output. If I do the reverse I am still getting LED output. Only when both are present there is no output. Could you please tell me what is the current path?