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4-10. Dwell
1.
Set rotary selec tor to ms-Pulse,
Dwell, Duty position.
2.
Press menukey 3 t o select Dwell
function. The met er defaults at 4
cylinders (
).
Pres s Cy inder) but t on
moment ar ily and repeatedly t o
selec t t he required number of
cylinder and display the cylinder
setting in the second display.
3.
Insert black lead into COM terminal
and red l ead int o ms (-P ulse)
terminal.
4.
Connect t he test leads as shown
and read Dwel l angle in t he
pr imary di splay . A djus t tri gger
levels by pressing but ton
momentarily, if necessary.
5.
Press menukey 2 momentarily t o
display Dwell reading in terms of
percentage if required.
6.
The frequency of the same signal
sourc e can be displayed in t he
second display by pressing the
button momentarily twice.
7.
Adjust the dwell angle according to
the procedures outlined in your
vehicle service manual.
NOTE: Recheck the timing whenever
the d wel l angle has been
adjusted.
4-11. Duty Cycle
1. Set rotary selector to ms-Pulse,
Dwell, Duty position.
2. Press menukey 2 t o select Duty
function.
3. Insert black lead into COM terminal
and red l ead int o ms (-P uls e)
terminal.
4. Connect the test leads as shown
and read the duty cycle percentage
in the primary display.
Adjust trigger levels by pressing
but ton moment ari ly, if
necessary
5. Press menukey 1 or 3 momentarily
to dis play Dut y Cycle reading in
ter ms of ms (P uls e Wi dth) or
(Dwell) angle if required.
6. The f requency of t he same signal
source can be dis pl ay ed in t he
second display by pressing the
button momentarily twice.
In most applic ati ons , the negat iv e
trigger slope is assigned to display the
percentage of time that the plunger is in
the c los ed posit ion (low duty cy cle)
during one duty cycle. The positive slop
is assigned to display the percentage of
time that the plunger is in t he open
posit ion. Ref er to t he c ar’s servic e
manual to v erif y slope ass igned t o
position for each component.
Press the (±Trigger) button for
more than 1 second to toggle between
the negat ive (-) slope and the positive
(+) slope, if required.
