Data Holding - UNI-T UT105 Operating Manual

Model UT105: OPERATING MANUAL
Measurement Operation(10)
If a DIS ignition system without any distributor
l
board is used in the automobile, connect the red
test lead probe to the TACH (tachometer) signal
line (which is connected to the computer DIS
module of the automotive engine). Refer to the
automotive servicing manual for the specific
position.
If an ignition system with a distributor board is
l
used in the automobile, connect the red test lead
probe to the primary negative end of the ignition
coil. (Refer to the automotive servicing manual for
the specific position.)
3. Connect the black test lead probe to the good ground
terminal of the automobile.
4. Upon the start of the engine or during its operation, test
the rotation speed of the engine and read the displayed
value from the display. The actual rotation speed of the
automobile to be tested should be equal to the displayed
value multiplied by 10. For example, the actual rotation
speed of the engine of the automobile should be 2000
RPM (200 x 10) if the displayed value is 200 and the
meter is set at the 6CYL (6 cylinders) notch.
H.Data Holding
Under any testing circumstances, the display of the meter
holds the testing result as soon as the HOLD is pressed
down. When the HOLD is pressed once more, the testing
result held in the display of the meter will be unlocked
immediately and the meter randomly shows the current
testing result.
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