Oscilloscope Patterns and Waveforms

Standard Wave Pattern Observation Conditions




Standard wave pattern




Wave pattern observation points
Point: Condition of wave pattern build-up section and maximum voltage (Refer to abnormal wave pattern examples 1 and 2.)

Examples of abnormal wave patterns




- Example 1
Wave pattern during engine cranking
Cause of problem
Open-circuit in ignition primary circuit
Wave pattern characteristics
Top-right part of the build-up section cannot be seen, and voltage value is approximately 2V too low.




- Example 2
Wave pattern during engine cranking
Cause of problem
Malfunction in ignition power transistor
Wave pattern characteristics
Power voltage results when the ignition power transistor is ON.