11
BA314001-en
4.4 Stall
Test
Insert Probe
Insert the supplied sample probe fully into the exhaust
of the vehicle or plant under test, using the spring wire
retainers to secure the probe in position. Confirm that
the engine is running and at normal operating
temperature, with the transmission engaged in
accordance with the MDG 29 procedures.
Initiate Test
After inserting the probe, check that the vehicle or plant
under test is chocked or braked to prevent movement
and ensure that all personnel are clear. With the test
operator at the controls, check for clear line of sight to
the MPM-4M screen. When ready, press the ENTER
push button.
The green LED on the front panel will illuminate
(steady) and a 5 second countdown will start, allowing
the operator to anticipate the time when measurements
will commence.
Run Test
Immediately after the countdown, the instrument will
start measuring and storing PM concentration
measurements, and the display will change to the
following “IDLE” screen.
To assist the operator, the green LED will flash slowly,
indicating measuring is ON and the engine should be
at normal idle speed (with the transmission engaged).
After 20 seconds the green LED with start to flash
quickly, indicating the “Full Power” mode of the test. A
this point the operator should rapidly apply full throttle
and hold the engine at full throttle.
The screen changes to show “FULL POWER” and
updates the exhaust PM concentration every second.
