80 BA052301-en
9.2.3 Discrete Measurement
Notes on adjusting the engine rpm via the light barrier
When making adjustments in the lower rpm range (drive shaft rpm < 800), we recommend using
two reflectors in order to double the number of impulses generated.
When doing so, please remember the following:
• The reflectors must be systematically placed around the engine, exactly opposite one
another. Prominent points on the engine housing can be used to position the reflectors.
• When entering the gear ratio you must also double the previous value.
Discrete power measurement makes it possible to approach pre-defined points and hold them
for a specified time as a function of the speed or RPM. These target points must be set before
testing begins.
The Start- and End speeds or RPM as well as the test increments and hold time are entered by
the inspector.
Hold time is defined as the length of time which the pre-set approached RPM and/or speed is
held constant. The hold time assures a stable test point so that for example enough time is left
for a fuel consumption test to be done.
The Start-Hold time eases the regulation procedure. More accurate test results are supplied for
turbo-charged engines, whose charger often has a delayed reaction.
1 Position the vehicle on the dyno and fix it.
2 Call up the menu MEASURE ENGINE
POWER and then the menu point DISCRETE
MEASUREMENT .
→ The following screen appears:
3 Select the measurement type and enter the
parameter via the digit keys into the entry
boxes.
4 Use the button<F8 CONTINUE>.
5 Select the vehicle data or, if available, load
these from the database with <F6
DATABASE>.
6 Use the button <F8 CONTINUE>.
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