cupoftea
Advanced Member level 5
Hi,
You know when you have cheap diff probes, and you scope the primary post rectifier bus of a PFC stage which stops switching for 2ms dead time around the zero crossing...and the leakage current through the diff probe makes the DC bus looks like its holding up in the "valley" when it isnt. (the "valleys" which occur every 10ms).....how do you get round this without buying an expensive diff probe?....i always float the scope and put a 100:1 on it, but i am not allowed to do that here.
You know when you have cheap diff probes, and you scope the primary post rectifier bus of a PFC stage which stops switching for 2ms dead time around the zero crossing...and the leakage current through the diff probe makes the DC bus looks like its holding up in the "valley" when it isnt. (the "valleys" which occur every 10ms).....how do you get round this without buying an expensive diff probe?....i always float the scope and put a 100:1 on it, but i am not allowed to do that here.