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BA314001-en
4.3 Test
Selection
The MPM 4M is pre-programmed to lead the operator
through one of two standardised test procedures;
either a stall test for vehicles and plant with a torque
converter, and a free acceleration test for other types
of equipment, such as vehicles with a manual clutch.
This screen appears automatically after the instrument
has been zeroed. Pressing the
ENTER
push button
during the 5 second countdown will initiate a free
acceleration test. If the
ENTER
button is not pushed
during the countdown, the instrument will automatically
initiate a stall test routine.
See the note (next page) for an introduction to the
available tests.
NEW
: For
continuous measurement
, (for instance
while testing for longer periods under actual operating
conditions) hold down the
ENTER
button while turning
on the power switch. Real-time DPM levels can be
recorded via the MPM-View software on a laptop. This
operating mode also allows calibration checks to be
done more quickly and conveniently.
NOTE
The Appendix to this document contains an extract from the MDG 29 guidelines relating to the
stall and free acceleration tests. The full MDG 29 document covers a wide range of additional
material relevant to management of air quality in underground mines. A hyperlink to the full
MDG 29 document is also in the Appendix.
Each of the pre-programmed tests has a duration of 60 seconds, and both have two engine
modes: for the stall test these are idle and full power; for the free acceleration test they are idle
and full throttle governed engine speed (no load). See (A) and (B) below.
Fig. 3: Stall and Free Acceleration Tests
