You can see there's a host of tests in here, but the first one there Alternator ripple test and it says the view alternator ripple with this tool coupling AC is used.
This subtracts the average value of a waveform and amplifies small variations in the waveform by blocking the DC portions of an input signal.
This method is ideal for viewing alternator ripples.
So this would be the ups and downs between the diodes.
So all we have to do is hook it up as instructed so it says positive on the alternator and negative on battery negative.
Or alternatively we can go alternator positive to battery positive, which is what we've done here.
All we have to do is hit view meter.
It will set it up for us and it'll show us what the ripple looks like.
All right, a little bit of noise but not a major issue here.
You can see a little bit, doesn't look too bad, looks pretty pretty normal.
Humps that appear in the waveform represent the condition of the diode.
So we see a known good pattern here on the top and then if we go down to the bottom you can see the most common failure are shorted or open diodes and you can see the example there where the pattern would drop out.
So as you can see, a quick easy way to test the internals of the alternator.