Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Testing Generator Using Measurement System
Enter the measurement system and select Preset Measurements.
Instruction on the proper hook-ups required are available through the HELP button, selecting Help using Preset Measurement.
The oscilloscope will display pre-configured for the testing.
Diagnostic information available through oscilloscope.
- Voltage Graph.
- Charging Current.
- Harmonic Content.
- Rotation Speed (Engine RPM).
Harmonic Content:
This is an expression of AC voltage contained in DC voltage.
The higher the percentage of harmonic content the larger the amount of residual AC voltage in the DC voltage.
High residual AC voltage is caused by weak or failing diodes in the generator. Generators which have harmonic content readings higher than specified (In TIS) should be replaced.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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