Duty-Cycle Measurements - Urrea UD88 Manual De Usuario Y Garantía

E N G L I S H
the CYL (RANGE) button repeatedly to cycle through
the number of cylinders between 1 and 12 (excluding
7,9 and 11). In the RPM IG, the number of stroke can
not be changed. If you want to change the number of
stroke, you must go to the RPM IP to change strokes
by pressing the STR (RANGE) button and then return
to the RPM IG mode.
WARNING: THE IGNITION SYSTEM CAN GENERATE A
POTENTIAL SHOCK HAZARD. ENSURE THAT THE ENGINE
IS TURNED OFF BEFORE CONNECTING OR REMOVING THE
TEST LEADS.
To measure RPM:
- Select the RPM IG range with the rotary switch.
- Press the RANGE button to select the required
number of cylinders
Insert:
- Black lead in COM jack.
- Red lead in VΩRPM CAP jack.
Connect:
- Black test probe to any good Ground near the coil.
- Red test probe to the primary side of the ignition
coil.
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Start the engine and note the reading on the display
while moving the throttle.
If the reading is too high or unstable, adjust trigger
level.
NOTE: Before measuring RPM, consult the car's service
manual to obtain the information on the number of stroke
and cylinder for the car's engine to be tested.

DUTY-CYCLE Measurements

DUTY-CYCLE is the percentage (%) of time that
a voltage is positive compared to negative: On
compared to Off.
There are many signals on a vehicle where you might
be required to measure DUTY-CYCLE. Signals from
Mixture Control Solenoid of a feedback carburetor,
signals from Cam or Crank sensors and the control
signals for fuel injectors are good examples.
This exercise shows how to measure DUTY-CYCLE
on the signal for the mixture control solenoid of a
feedback carburetor using the Meter.
To measure DUTY-CYCLE (%):
- Select the RPM IG range with the rotary switch.
- Press the % DUTY button until % appears on the