The DVA is explained on page 3 of the CDI troubleshooting guide. It measures the peak of AC voltage. On your engine you want to test the cranking voltage outputs of both the stator and the timer base. The stator output is measured between the brown wire and the brown wire with the yellow tracer. Expect voltage to be between 150 and 400 volts. Less than that and the stator is condemned. The timer base cranking voltage is expected to be 0.6 volts measured between the black wire with the white tracer and the white wire with the black tracer. If both of those test out ok, then the process of elimination gets you to the power pack or bad coil.
