Check Air Gap :
Using a feeler gauge , meassure the air gap between the pickup coil protection and the reluctor tip.
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Capture the signal waveform on a digital oscilloscope and record below show peak to peak voltages as well as wave time.
Describe the waveform what is happening at different points.
When we spin the reluctor a pole pice on the wheel approaches the trigger assebbly until the air gap is at is smallest now the pick up coil has reached saturation a positive voltage is induced you can see this as point A on photo. As the reluctor wheel moves away the magnetic field collapses causing a inducied voltage in the opposite direction you can see this at point B.
Hall Effect Sensors :
Wire up a distributor and connect an oscilloscope then spin the distributor and observe the wave form.
In the photo above point (A) is the dwell time when the voltage is high and the blade is in the air gap and coil is grounded by the Hall intergrated IC. When a window moves into the air gap the magnetic field is able to cross to the hall IC pulling the voltage down to 0 this can be seen a point (B) and (C). This is the firing point.
