First off, pulse mode is not required for a good weld or learning to weld. I recommend you start without pulse. You will be better off if you do. Unless you are doing some really thin metal.
I do use pulse on thin metal where you need to keep the heat down, otherwise, I do not use it.
The large AMP knob is the peak/max current for the weld, the ratio knobs lets you lower the base current to a lower value than the AMP knob (the peak). Look at the display when you do this and you can see it will alternate back and forth to the PEAK and BASE amp range.
There is a pulse time ON to the right of it that allows you to set the time the PEAK current ON and the BASE current is on. You get a ratio of the PEAK and BASE to the work.
If you turn the knob counter clockwise, you will lower the BASE current more, clockwise to increase it..
Hope this helps.
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