Dwell Testing - UNI-T UT105 Operating Manual

Model UT105: OPERATING MANUAL
Measurement Operation(8)
F.Dwell Testing (see figure 7)
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 terminal and the black test lead
into the COM terminal. Connect the ends to be tested
as illustrated.
If the cut-off switch of an ignition system is
l
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.)
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