UNI-T UT105 Operating Manual page 46

Model UT105: OPERATING MANUAL
Measurement Operation(30)
(3) Taking 4 cylinders (4CYL) for example, connect the
black test lead probe of the meter to the ground
terminal (i.e. ground strap connection) and connect
the red one as illustrated in figure 20.
(4) Turn on the ignition key but do not start the engine.
Displayed Values:
DC Voltage Type Sensor:
In a vacuum state, the displayed value is generally
between 3 V and 5 V. (The details shall be based on
the parameters furnished by the supplier.)
Frequency Type Sensor:
In a vacuum state, the displayed value is generally 4770
RPM 5%. (This only applies to the MAP sensor produced
by Ford and the other sensors shall be based on the
parameters furnished by the supplier.)
Warning:
l The reading becomes the actual RPM only after
it is multiplied by 10.
l Frequency = RPM/30. (This only applies to 4CYL.)
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