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MMD 540H Instruction Manual | Version 1 | February 2008 Robert Bosch LLC
Meter Functions – ms-PULSE (Pulse Width)
& ms-PERIOD (Period)
Pulse Width is the length of time an actuator is energized. For
example, fuel injectors are activated by an electronic pulse from the
Engine Control Module (ECM).
This pulse generates a magnetic fi eld that pulls the injectors nozzle
valve open.
The pulse ends and the injector nozzle is closed.
This open to close time is the Pulse Width and is measured in
milliseconds( ms).
The most common automotive application for measuring pulse
width is on fuel injectors.
You can also measure the pulse width of the fuel mixture control
solenoid and the idle air control motor.
Measuring Pulse Width on Port Fuel injectors is described on the
following page.
(continued on next page)
MMD 540H Hybrid Multimeter | Met
er Functions | 23