In the image:
- Channel 1: Drain to source voltage
- Channel 2: gate to source voltage
- Channel 3: Switch current
- Channel 4: Load current
The image shows Vds of low side MOSFET at turn on measured with a passive and differential probe seperately. As you can see, differential probe has a skew compared to passive probe, which is understandable.
But: Why does the reading, after turning on the passive probe, become negative whereas the differential probe still shows the correct reading?