Oscilloscope Patterns and Waveforms

MEASUREMENT METHOD
1. Clamp the spark plug cable (No.1, No.2, No.3, No.4, No.5 or No 6) with the secondary pickup.




2. Clamp the No.1 cylinder spark plug cable with the trigger pickup.







STANDARD WAVE PATTERN
Observation conditions

WAVEFORM OBSERVATION POINTS




Point A: The height, length and slope of the spark line (refer to abnormal waveform examples 1, 2, 3 and 4) show the following trends.




Point B: Number of vibration in reduction vibration section (Refer to abnormal waveform example 5)




Point C: Number of vibrations at beginning of dwell section (Refer to abnormal waveform example 5)




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




ABNORMAL WAVEFORMS EXAMPLES