Advertisement
5.2.
Vehicle Preparation
5.2.1.
Straighten vehicle wheels.
5.2.2.
Check the tyre pressures.
5.2.3.
ensure the headlights are clean and dry.
5.2.4.
If the vehicle is fitted with manual or electric headlamp levelling device, ensure this is set for vehicle with normal load.
5.2.5.
Remove anything which could alter the attitude of the vehicle, i.e. load, snow, ice, mud, etc.
6. OPTIcAL POSITIONINg
5.1.
Positioning
locate the HBS approximately 200 to 500mm from the vehicle headlamp.
5.1.1. Standing behind the HBS, use the visor to align with a horizontal, or two symmetrical points on the vehicle i.e. the bonnet lip or the
bottom of the windscreen.
5.1.2. ensure the visor line is parallel with the horizontal, or symmetrical selection, by rotating the HBS. This will ensure that the HBS is
square with the front of the vehicle.
5.1.3. Measure the height of the centre of the headlamp from the floor - say 650mm as an example.
5.1.4. Squeeze the locking lever (fig. 3. C) on the vertical sliding system and move the system up or down the column until the top edge of the
slider (fig. 3.d) aligns with 65cm (650mm) on the column scale. Release locking lever. Centre of lens will now be at the same height
(650mm) as the centre of the headlamp.
5.1.5. Use the sighting line on the top of the optical system housing to horizontally align the HBS with the centre of the headlamp.
7. METHOD Of INSPEcTION
7.1.
Start engine, so that battery is not drained.
7.2.
Align the HBS with the centre of the headlamp to be tested, as in Section 5.
7.3.
With an assistant sitting in the driving seat, switch on the headlamp to the beam, dip or main, which is to be checked.
Note: When checking headlamp aim on vehicles with hydropneumatic suspension systems, it is necessary to have the engine
idling.
7.4.
determine the appropriate dip beam image and the aim (see figs. 5 & 6). Headlamps of older vehicles (approx. pre 1950)
may have beam images which do not conform. In such cases check:
a) DIP BEAM headlamps are aimed so they do not dazzle, ie the brightest part of the beam image is aimed at least 0.5% below
the horizontal (fig. 5), or, for headlamps which cannot be checked on dip beam, check:
b) MAIN BEAM headlamps are aimed so that the beam image centre is on or slightly below the horizontal (fig. 7).
7.5.
graduated Screen
IMPORTANT This HBS uses a fixed graduated screen in accordance with the requirements of the MoT regulations. However it
must be noted that the HBS2001 is not approved by the Vehicle Inspectorate for conducting tests in accordance with MoT
requirements.
© Jack Sealey limited
fig.3
fig.4
CoRReCT lIGHT PRoJeCTIon on THe lIne 0.5% (BeAM lIGHT)
Original Language Version
HBS2001 Issue 3 (HF) 14/08/18
Advertisement
