Measuring A Low Resistance - Yamaha 25BMH Service Manual

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ELEC
ELECTRICAL COMPONENTS ANALYSIS/

MEASURING A LOW RESISTANCE

NOTE:
• When measuring the peak voltage, set
the selector to the DC voltage mode.
• Make sure the peak voltage adapter
lead are properly installed in the digital
tester.
• Make sure the positive pin (the "+"
mark facing up as shown) on the peak
voltage adapter is installed into the
positive terminal of the digital tester.
• The test harness is needed for the fol-
lowing tests.
Measuring steps
(1) Connect the peak voltage adapter
probes to the connectors.
(2) Start or crank the engine and observe
the measurement.
MEASURING A LOW RESISTANCE
When measuring a resistance of 10Ω or less
with the digital tester, the correct measure-
ment cannot be obtained because of the
tester's internal resistance.
To obtain the correct value, subtract the
internal resistance from the displayed mea-
surement.
Correct value
Displayed measurement-internal
resistance
NOTE:
The internal resistance of the digital tester
can be obtained by connecting both of its
probes.
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