High Beam; Fog Lamp; Operation; Preparation - Bosch HTD 8 Serie Originalbetriebsanleitung

R
"C": Deviation of break point from the vertical
(also referred to as pitch angle). The value is always
shown as an absolute value. Possible units:
%, cm / 10 m, degrees
R
"D": Deviation of break point from the horizontal.
The value is always shown as an absolute value.
Possible units:
%, cm / 10 m, degrees
R
"α": Angle between the "shoulder" and the horizontal
section of the cut-off (also referred to as yaw angle
with asymmetrical low beam).
R
"b": Angle between the left portion of the cut-off
and the horizontal (also referred to as roll angle,
usually 0°).
4.3

High beam

The following illustration shows the most important
high beam measurement quantities.
v'
E
h HV
H
v
Fig. 16: High beam measurement quantities
R
"E": Zero point of beamsetter (centre of headlamp).
This point is the basis for the measured values.
Deviations are measured from this point.
R
"F": Tolerance band. The high beam hot spot should
be within this range.
R
"G": Hot spot.
R
"H": Horizontal distance of hot spot from centre
point. Possible units:
%, cm / 10 m, degrees
R
"I": Vertical distance of hot spot from centre point.
Possible units:
%, cm / 10 m, degrees
4.4

Fog lamp

The fog lamp is measured in a similar manner to the low
beam, the difference being that the cut-off does not
have a break point but takes the form of a continuous
horizontal line.
Robert Bosch GmbH
F
h'
G
I
Operation | HTD 8xx | 31
5.

Operation

5.1

Preparation

5.1.1

Working surface

A flat surface is required to ensure accurate headlamp
adjustment. If this is not available, the beamsetter and
the vehicle must at least be positioned on a surface
with a similar difference in height. The inclination must
not be more than 0.5 %.
Fig. 17: Slope of working surface
5.1.2

Horizontal position

The horizontal position of the beamsetter is checked
using the spirit level in the light box.
1. Position the beamsetter in the working area.
2. Use the spirit level inside the light box to check the
horizontal position.
Fig. 18: Spirit level
3. If not correctly levelled, perform adjustment at the
trolley. Three of the wheels are height-adjustable.
$
Slacken off the wheel bolt slightly.
$
Alter the angle by turning the adjusting screw
above this.
$
Re-tighten the wheel bolt.
$
Adjust the heights of the other wheels if
necessary.
en
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1 692 104 611 2014-10-15