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Model UT106: OPERATING MANUAL
5. RPMx10 Testing (see figure 17)
Set the rotary switch to RPMx10 and select the
number of cylinders in the automobile to be tested.
As prompted at the LCD connect terminal, insert the
red test lead into the terminal and the black one
into the COM terminal.
Connect the black test lead probe to the ground (i.e.
ground strap connection) of the automobile and the
red one to: the appropriate testing test terminal of the
computer of the automobile if the automobile is in a
DIS type (Refer to the servicing handbooks of various
kinds of automotive manuals for the detailed position);
or the negative pole of the ignition coil if the automobile
is equipped with a distributor board (Refer to the
servicing handbooks of various kinds of automotive
manuals for the detailed position).
The normal starting rotation speed of an engine is
about 50 RPM to 275 RPM. Refer the detailed position
to the servicing handbooks of various kinds of
automotive manuals because this value relates to the
then temperature, engine size, battery size, etc..
(1)
(2)
(3)
(4)
(figure 17)
Warning
The displayed value of the meter becomes the actual
tach reading only after it is multiplied by 10.
Ignition Coil
Ground
Red
Black
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