Measuring Images; Headlamps With Asymmetrical Lower Beam; Headlamps With Symmetrical Lower Beam, And Fog Lamps; Headlamps With Inclination Data - Bosch EFLE 50 Instructions D'emploi

4.

Measuring images

The measuring images can also be observed from the rear of the
aiming device by means of the deflection mirror (Fig. 10, No. 3).
Before every measurement the prerequisites given in Section 2
above must be complied with.
4.1

Headlamps with asymmetrical lower beam

With headlamps used for an asymmetrical lower beam, the lower
beam cut-off line must coincide with the boundary line to the left of
the center point. The point of intersection between the left-hand
part of the lower beam cut-off line (as horizontal as possible) and
the right-hand rising part of this line must be located on the vertical
line that passes through the center mark. In order to determine this
point of intersection more easily, the left-hand half of the handlamp
can be alternately masked and unmasked serveral times.
After the lower beam cut-off line has been set according to
specifications, the center of the high beam with headlamps on
which the lower beam and upper beam can be aimed together
must lie within the limit corners inscribed around the center mark.
With high-beam headlamps fitted with their own adjustment me-
chanisms, the center of the light beam must be positioned on the
center mark.
4.2 Headlamps with symmetrical lower beam, and fog
lamps
With headlamps used for a symmetrical lower beam and with fog
lamps, the highest part of the lower beam cut-off line must touch
the boundary line, must be as horizontal as possible across the
width of the test surface.
To the side, these headlamps must be aimed so that the distribution
of the light is as symmetrical as possible with respect to the vertical
line that passes through the center mark.
After the lower beam cut-off line has been set according to
specifications, the center of the high beam with headlamps on
which the lower beam and upper beam can be aimed together
must lie within the limit corners inscribed around the center mark
(see Fig. 8).
With high-beam headlamps fitted with their own adjustment me-
chanisms, the center of the light beam must be positioned on the
center mark (see Fig. 8).
12
Example: Boundary line for the lower eam cut-off with an asym-
metrical lower beam.
Fig. 7
Example: Center mark and boundary corners for the center of the
higt beam.
Fig. 8
Example: Boundary line for the lower beam cut-off with a symme-
trical lower beam and with fog lamps.
Fig. 9
4.3

Headlamps with inclination data

In the case of single-axle towing vehicles or machines with
headlamps permanently set to the lower beam and on which the
inclination of the light beam center is given, the center of the beam
must lie on the boundary line and on the vertical line that passes
through the center mark.