Oscilloscope Pattern #1

Evaluation of primary oscilloscope patterns

HFM-SFI

Primary individual pattern, 400 volt range.

Ignition system o.k.


1 Zener voltage

2 Starting point of burn voltage line

3 Burn voltage line

t Burn time

This example shows a primary ignition voltage in the 400 volt range at idle speed. The ignition system is o.k.

The Zener voltage (1) is approx. 340 volts, the burn time is approx. 1.3 milliseconds.