7-10
E
–+
ELEC
ELECTRICAL ANALYSIS
Low resistance measurement
NOTE:
● When measuring a resistance of 10 Ω or
less with the digital tester, the correct
measurement cannot be obtained
because of the tester’s internal resistance.
● To obtain the correct value, subtract the
internal resistance from the displayed
measurement.
● The internal resistance of the tester can be
obtained by connecting both of its termi-
nals.
Peak voltage measurement
NOTE:
● When checking the condition of the igni-
tion system it is vital to know the peak
voltage.
● Cranking speed is dependant on many
factors (e.g., fouled or weak spark plugs, a
weak battery). If one of these is defected,
the peak voltage will be lower than speci-
fication.
● If the peak voltage measurement is not
within specification the engine will not
operate properly.
● A low peak voltage will also cause compo-
nents to prematurely wear.
Peak voltage adaptor
NOTE:
● Throughout this chapter the peak voltage
adaptor’s part number has been omitted.
Refer to the following part number.
● The peak voltage adaptor should be used
with the digital tester.
Correct value =
Displayed measurement –
Internal resistance
Peak voltage adaptor:
YU-39991/90890-03169
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