Operating Instruction
95980775
35
EN
Measuring Engine Tach (Rotation Speed)
1. Connect the black test lead to the COM
jack, and the red test lead to the
jack. (Note: The polarity of the red lead is
positive “+”.)
2. Set the range switch to
position.
3. Press the CYL button until the number of
cylinders of the engine to be tested ap-
pears.
4. Connect the black test lead to ground or
the negative terminal of the battery, and
the red test lead to the low voltage ter-
minal of the distributor or the negative
terminal of the ignition coil.
5. Start the engine and read the reading on
the display.
Note:
1. The input voltage must be between 3Vp
and 50Vp. If the voltage is too low, the
speed measurement cannot be carried
out.
2. Reading’s stability will decrease if the ro-
tation speed of the engine is too low.
3. The polarity of the input voltage must be
correct, otherwise it will be impossible to
perform the measurement.
Auto Power Off
The display will blank and the meter will go
into “Sleep”mode if you do not operate the
meter for about 30 minutes. To arouse the
meter from Sleep, rotate the range switch.
To disable the automatic power-off feature,
turn on or arouse the meter while pressing
and holding down the FUNC button.
Ignition Coil
Ground
