Hi,
just tried to scope my active PFC with scope, but it seems i am unable to see anything. When i turn pfc on and probes are not connected (rigol 1054z) ripple is low, when i move my hand to bnc connector ripple increase to range of hundreds of mVolts. Also if probe is connected to the osciloscope and shorted at the end that should go to pcb ripple is still high (range of 10-100mV).I got ripple instantly when i connect something to bnc connector. Even if i just stick wire to the midlle of that connector as few cm antenna ripple goes crazy. When pfc is off i can see clearly trace near 0V level. I have no idea how should i block it. I would need to place it in hermetic isolated conductive ´ball or something like that.,
* i am measuring voltage on current shunt resistance