General Information

- All equipment for testing headlamps must comply with the SAE Recommended Practice for Headlamp Inspection Equipment.
- If you use a headlamp testing machine, the machine should give results equivalent to the results obtained using the screen procedure.
- The machine should be in good condition and be properly adjusted.
Use the machine in accordance with the manufacturer's instructions.
- Machines that use a photoelectric cell or cells to determine aim, should also include a visual screen on which you can project a beam pattern proportional to the beam appearance, and aim on a screen at 10 m (32.8 ft).
- The screen should be plainly visible to the technician who is adjusting the headlamps.
- The screen should have horizontal (3) and vertical (1,2) reference lines in order to permit visual evaluation of the headlamp beam.