Simple, no-math transformer snubber using Quasimodo test-jig

[jminassi]

I don't have the second channel on. I am reading this with only the channel 1 probe hooked up. I now have a relatively stable wave form at 2 volts/division and 1us/division. But the waveform is to the extreme right of the screen, and the horizontal position knob will not let me move it to the left.

I don't understand what the channel 2 probe would be reading. I'll go back to Mark's abstract and re-read what it says about it. But I thought he said you could get a reading with just one channel.

Thanks,

John

 

[RickRay]

Read the write up by Mark. The second channel is the trigger, the first channel is the signal.

 

[jminassi]

Ok, I see the way it should be set up with two probes under the heading "Triggering The Oscilloscope". I think the second probe provided with the Hantek scope is a high voltage probe. Let me think about I can make this work.

Thanks,

John

 

[Plott]

Okay, I set up everything again, after reading every write up from @Mark Johnson and now it really works without issues - lession learned: RTFM! And with this correct setup I get 33,1 ohms for the Toroidy TTSA0020 with shorted 230 VAC primary and 2x15 VAC secondaries, one of them shorted (caps 150 nF/10 nF).
Setup is: trigger set to - 2 volts (the minimum possible value) and falling edge, T 1 us.
Could someone please tell if it is correct, based on the graphs? Many thanks in advance.