Oscilloscope Patterns and Waveforms

MEASUREMENT METHOD




1. Clamp the high tension cable with the secondary pickup.




2. Clamp the spark plug with the trigger pickup. (As basic, clamp the spark plug cable of No. 1 cylinder)





NOTE: The wave-form of the cylinder clamped with the trigger pickup will be displayed on the left end of the screen.

STANDARD WAVE-FORM





Observation Conditions




Observation conditions (Only PATTERN SELECTOR below changes from the above conditions)

WAVE-FORM OBSERVATION POINTS




Point A: The height, length and slope of the spark line (refer to Abnormal Wave-form Examples 1, 2, 3 and 4) show the following trends.




Point B: Number of vibrations in reduction vibration section (Refer to Abnormal Wave-form Example 5)




Point C: Number of vibrations at beginning of dwell section (Refer to Abnormal Wave-form Example 5)




Point D: Ignition voltage height (distribution per each cylinder) shows the following trends.





EXAMPLES OF ABNORMAL WAVE-FORMS