ENGINE ELECTRICAL ± Charging System
16-9
WAVEFORM CHECK USING AN ANALYZER
MEASUREMENT METHOD
Connect the analyzer special patterns pick-up to the alternator
B terminal.
STANDARD WAVEFORM
Observation Conditions
FUNCTION SPECIAL PATTERNS
PATTERN HEIGHT VARIABLE
VARIABLE knob Adjust while viewing the wave-
form.
PATTERN SELECTOR RASTER
Engine speed Curb idle speed
Voltage at
alternator
B terminal
0.4
0.2
0
± 0.2
± 0.4
Time
NOTE
The voltage waveform of the alternator ªBº terminal can
undulate as shown at left. This waveform is produced when
the regulator operates according to fluctuations in the alternator
load (current), and is normal for the alternator.
In addition, when the voltage waveform reaches an excessively
high value (approx. 2 V or higher at idle), it often indicates
an open circuit due to a brown fuse between alternator ªBº
terminal and battery, but not a defective alternator.
Alternator
Special
patterns
pickup
Analyzer
B terminal
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