VEHICLE
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3.3Mechanically Aimable Headlamp
A headlamp having three pads on the lens, forming an aiming plane or an aiming ring, the aiming plane or aiming ring being used for laboratory photometric testing and for inspecting the aim of the headlamp when installed on the vehicle.
3.4Aiming Plane
A plane defined by the surface of the three aiming pads on the headlamp lens or by the forward surface of an aiming ring.
3.5Headlamp Optical Axis
The line formed by the intersection of a horizontal and a vertical plane through the light source parallel to the longitudinal axis of the vehicle. If the optical axis of the headlamp is not at the geometric center of the lens, then the location will be indicated by the manufacturer on the headlamp.
3.6H-V Axis
A line from the center of the principal filament formed by the intersection of the horizontal (H) and vertical (V) planes which intersect the filament and are perpendicular to the test screen.
3.7Seasoning
Process of energizing the filament of a bulb at design voltage for a period of time equal to 1% of design life or 10 h, whichever is shorter.
3.8Design Voltage
The voltage used for design purposes.
3.9Test Voltage
The specified voltage and tolerance to be used when conducting a test.
3.10Rated Voltage
The nominal circuit or vehicle electrical system voltage classification. (Example: 12 V headlamp.)
3.11Headlamp Test Fixture
Device specifically designed to support a headlamp in the test position during laboratory testing. Mounting hardware and components shall be representative of those necessary to operate the headlamp in its normal manner.
3.12Aiming Screws
Screws with self-locking features used for adjusting horizontal and/or vertical aim and to retain the headlamp unit in the proper position.

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