Normal Oscillogram

NORMAL OSCILLOGRAM:



1. Start of ignition voltage spike
2. Tip of ignition voltage spike
3. Tip of combustion voltage spike
4. Combustion period
5. Combustion voltage curve
6. Start of attenuation procedure
7. Decay current

Evaluation of ignition voltage peaks at idle speed (this example shows an engine with 4 cylinders).

Display Side-by-Side - Idle:

- Evaluation of combustion voltage line and attenuation procedures.
- The display of ignition voltage peaks is approx. 20-25% lower than the real value. More important than the tip of the ignition voltage spike is the uniformity of all cylinders. Deviations of 3000-4000 V are permitted. If deviations exceed these values, Fault Patterns

Evaluation of ignition voltage peaks at increased speed of approx. 2000 rpm (this example shows an engine with 4 cylinders).

Display Side-by-Side - Approx. 2000 RPM:

- Display at increased speed of approx. 2000/min.
- Evaluation of ignition voltage spikes.

Evaluation of combustion characteristics curve and decay characteristics at idle speed (this example shows a 4-cylinder engine).



- Secondary voltage diagrams, superimposed.

Consecutive Displays - Idle Speed:

- Secondary voltage diagrams, consecutive.

NOTE: Only the major differences in the ignition voltage patterns are revealed by this method of comparison. The allocation of faults identified on a given cylinder must be shown in the form of secondary voltage patterns, either beside one another or superimposed.