Measurement Method

Connect the oscilloscope special patterns pick-up to the generator "B" terminal.

Fig 1: Connecting Oscilloscope Special Patterns Pick-Up To Generator "B" Terminal

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STANDARD WAVEFORM

Observation Conditions
FUNCTION	SPECIAL PATTERNS
Pattern height	Variable
Variable knob	Adjust while viewing the wave pattern
Pattern selector	Raster
Engine revolutions	Curb idle speed

Fig 2: Generator B Terminal Voltage Graph

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NOTE: The voltage waveform of the generator "B" terminal can undulate as shown in illustration. This waveform is produced when the regulator operates according to fluctuations in the generator load (current), and is normal for the generator.
If the ripple height is abnormally high (approximately 2 V or more during idling), the wires between the generator "B" terminal and the battery have broken due to fuse blowing, etc. The generator is usually operating properly.

Fig 3: Generator B Terminal Voltage Waveform

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