| European
'E' Beam Headlamp ( Checked on Dipped Beam ) |
 |
European
type Characteristics
a. an asymmetric dipped beam pattern which when correctly aimed,
produces an imagewith a distinct line rising at 15 deg (45 deg
in some lamps) on the nearside |
| b.
a lens or reflector with one or more asymmetric stepped patterns
moulded in the glass/plastic |
| c.
a lens may carry a European approval mark - a circle containing
an 'E' and a number, or .a rectangle containing an 'e', and
a number |
Diagram
1
Check the beam image kick up is to the nearside-Check the image
horizontal cut-off is between
. for headlamps not more than 850mm from the ground, the 0.5%
and 2% lines, ie the red tolerance band
. for headlamps with centres more than 850mm from the ground,
the 1.25% and 2.75% lines ie the blue tolerance band.
Check the beam image 'break point' is between the 2% and 0%
vertical lines.
|
| Reasons
for Rejection |
| 1.
The beam image'kick-up' is to the offside. |
| 2.
For headlamps with centres not more than 850 mm from the ground
the beam image horizontal cut-off is not between the horizontal
0.5% and 2% lines, ie the red tolerance band. |
| 3.
For headlamps with centres more than 850 mm from the ground,
the beam image horizontal cut-off is not between the horizontal
1.25% and 2.75% lines, ie the blue tolerance band. |
4.
The beam image 'break point' is
· To the right of the 0% vertical line, or
· To the left of the vertical 2% line |
British
American Headlamp
(Checked on Main Beam ) |
|
|
Headlamps
tested on main beam have a
symmetrical main beam pattern with a central area of maximum
intensity (hot spot). |
This type of lamp generally has the following characteristics:
a. a circular lens which may be marked with a figure 1 followed
by an arrow indicating
the direction of dip;
b. likely to be of sealed beam construction.
Diagram 2Check the position of the centre of the area of maximum
intensity (hot spot) |
|
Reasons
for Rejection |
1.
The hot spot centre is above the horizontal 0% line
2. The hot spot centre is to the right of the vertical 0% line,
or to the left of the vertical 2% line.
3. For Headlamps whose centre is not more than 850mm from the
ground the hot spot centre is below the horizontal 2% line.
4. For Headlamps whose centre is more than 850mm from the ground
the hot spot centre is below the horizontal 2.75% line.
5. When dipped the brightest part of the image does not move
downwards or downeards to the nearside. |
| British
American Type ( Checked on Dipped Beam ) |
 |
Diagram
3
Dipped Beam Image
Check: the position of the upper and right hand area of the
maximum intensity hot spotBritish American type - Characteristics |
a.
an asymmetric dipped beam pattern which when correctly aimed
has a flat topped area of high intensity extending above and
parallel with the horizontal zero line on the nearside;
b. a circular lens marked with the figure 2 which may also have
an arrow showing the direction of dip;
Diagram 3
Dipped beam image
Check the position of the upper and right hand edge of the area
of maximum intensity ('hot spot'}
|
| Reasons
for Rejection |
1.
The upper edge of the hot spot is above the horizontal 0% line.
2. The upper edge of the hot spot is below the horizontal 2.75%
line.
3. The right hand edge of the hot spot is to the right of the
vertical 0% line or to the left of the vertical 2% line.
4. The raised portion of the (beam) image is to the right/offside
of the centre line. |
| Issue
Date: July 2001 |
