Dwell Testing - UNI-T UT106 Operating Manual

I. Dwell Testing (see figure 10)
Ignition Coil
It was very important in the past to test the dwell of the
cut-off switch of an ignition system. The dwell testing
means the duration when the cut-off switch remains off
when the cam is turning. Now as an automobile is ignited
electronically, it is no longer necessary to adjust the
dwell. In addition, the dwell testing can also be used to
test a mixed-controlled solenoid.
(e.g. GM feedback carburetor).
1. Set the rotary switch to DWELL .
2.
As prompted at the LCD connect terminal, insert the
red test lead into the
lead into the COM terminal. Connect the ends to be
tested as illustrated.
l
If the cut-off switch of an ignition system is tested,
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.)
l
If the GM feedback carburetor is tested, connect
the red probe to the ground terminal or the computer
drive of the solenoid. (Refer to the automotive
servicing manual for the specific position.)
l
If the dwell of an arbitrary ON/OFF equipment is
tested, connect the red probe to the end of the
equipment, fixed with an ON/OFF switch.
3.
Connect the black test lead probe to the good ground
terminal of the automobile.
4.
Read the ignition dwell of the tested automobile directly
from the display
Model UT106: OPERATING MANUAL
Red
Test Lead
Ground
Black
Test Lead
( figure 10)
terminal and the black test
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