Safety Precautions; Explanatory Notes On Measured Values; Pitch Angle; Low Beam - Bosch HTD 8 Series Original Instructions Manual

en 30 | HTD 8xx | Explanatory notes on measured values
3. Insert the battery with the bracket in the battery
compartment and fix the bracket in position with the
bolt.
Fig. 13: Inserting and securing the battery
3.6

Safety precautions

¶
The device is only to be operated by authorised
personnel trained to do so.
¶
Never use the device in an explosive atmosphere.
¶
The working area must be dry and adequately
ventilated.
¶
Watch out for other people when moving the device.
¶
The headlamps are checked and adjusted with the
vehicle engine running. An exhaust gas extraction
system must be installed. The inadvertent inhalation
of carbon monoxide can cause serious health
problems.
¶
Avoid direct sunlight and do not operate the
beamsetter in the vicinity of hot objects (fires,
radiators etc.).
¶
Never leave the beamsetter standing in the rain or in
a particularly damp place, as this could damage the
electronics.
¶
Put a dust cover (optional extra) over the beamsetter
during lengthy periods of non-use.
¶
The beamsetter contains a battery. Heed the
corresponding battery handling instructions on the
product.
¶
If problems occur during operation, contact
Bosch customer service or an authorised service
partner.
¶
Only use GENUINE spare parts. These can be
obtained from Bosch customer service or an
authorised service partner.
The use of parts from other manufacturers renders
the warranty invalid.
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4. Explanatory notes on
measured values
The following Sections explain the most important
measurement quantities required for headlamp
adjustment.
4.1

Pitch angle

The definition of the pitch angle is illustrated in the
following.
Fig. 14: Definition of pitch angle
R
"H": Height of centre of headlamp measured from
the ground
R
"h": Height of image projected by headlamp at
a distance of 10 m, measured from the ground
R
"e": Pitch angle, calculated with the following
formula: e = [(H-h) / 1000] x 100
4.2

Low beam

The following illustration shows the most important low
beam measurement quantities.
v'
h HV
C
D
β
v
Fig. 15: Low beam measurement quantities
R
"A": Cut-off, made up of two portions:
$
Horizontal section,
$
Rising straight line, also referred to as "shoulder";
the cut-off must be within the stipulated
tolerance range.
R
"B": Break point with asymmetrical light;
centre point with symmetrical light.
A
h'
α
B
Robert Bosch GmbH