ASBU smoke belching test

[K.I.L.L.]

for diesel engines here is the procedure

PHILIPPINE CLEAN AIR ACT OF 1999
ANNEX "C"
FREE ACCELERATION TEST FOR IN-USE COMPRESSION-IGNITION MOTOR VEHICLES
d. Accelerate the engine two to three times (2-3) prior to smoke sampling in order to remove deposits of soot and other carbon particles in the tail pipe.
e. With the engine idling, depress the accelerator quickly, but not violently, to obtain maximum delivery from the injection pump. Maintain this position until maximum engine speed is reached for about two (2) to four (4) seconds and the governor comes into action. As soon as this speed is reached, release the accelerator until the engine resumes its idling speed. Record the maximum reading of the smokemeter.

So what is the recommended RPM for the testers to rev your vehicle at? What is maximum engine speed? This is pretty vague and open to different interpretations. Does this mean that they are allowed to rev your vehicle all the way to the red line and maintain that for 2-4 seconds?