Electrical Analysis; Inspection; Low Resistance Measurement - Yamaha 40V Service Manual

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ELECTRICAL ANALYSIS

ELECTRICAL ANALYSIS

INSPECTION

CAUTION:
All measuring instruments should be han-
dled with special care, or the correct mea-
surement is impossible.
On an instrument powered by dry batter-
ies, the latter should be checked for voltage
periodically and replaced, if necessary.
NOTE:
" " indicates the terminals between
which there is a continuity of electricity; i.e.,
a closed circuit at the respective switch
position.
Peak voltage measurement
NOTE:
The coil output varies greatly at cranking
speed.
Cranking a cold engine with the plugs in
and a weak battery does not enable
proper readings.
Digital multimeter:
J-39299
Peak volt adapter:
YU-39991

Low resistance measurement

When measuring a resistance of 10 Ω or
less using the digital tester, the correct
measurement cannot be obtained because
of the tester's internal resistance.
To obtain the correct value, subtract this
internal resistance from the displayed mea-
surement.
Correct value =
Displayed measurement –
Internal resistance
NOTE:
The internal resistance of the tester can be
obtained by connecting both of its termi-
nals.
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