I am using a 5V pulse train generated from a UC3845 PWM controller to trigger a MOSFET (K2645) which is biased with 317VDC in series with Rd= 120ohms, Rs=20ohms and primary of the PWM transformer. I am able to see the pulse train of UC3845 but since I don't have an isolation transformer, I can't use it to see the PWMT waveform, which is also not detected on a DMM(AC mode). I have varied the pulse width to see the effect on the output. My DMM is only measuring in millivolt AC (both primary & secondary.
Q1. Can these high voltage pulse train be measured using a DMM in AC mode? Why not?