Document ID: chunk:federal_register_of_legislation:F2024C00148:reg:1:p30
Version: federal_register_of_legislation:F2024C00148
Segment Type: reg
Provision Reference: reg 1 (pt 30/34)
Character Range: 217662–220617

displayed on the monitor for each viewing distance.

           Where:

           r: viewing distance [mm]

                  bmin: minimum width of the critical object displayed on the monitor [mm]

              1.4.2.2. Step 2: Place the critical object inside the drawn intended field of vision in a position at which the distance between the critical object and the camera is largest. The illumination conditions shall be in such a way that the critical object is clearly visible on the monitor.

              1.4.2.3. Step 3: Select the first value of the possible viewing distances.

              1.4.2.4. Step 4: Change the height of the camera above ground in such a way, that the residual width B of the object displayed on the monitor is equal to the minimum width allocated to that viewing distance.

              B=bmin

                     Where:

                  B: residual width of the object displayed on the monitor (which is "b" in cases without smear and "b – s" in cases with smear) in mm (see paragraph 1.1. General)

              1.4.2.5. Step 5: Measure the height between camera and ground which is the maximum mounting height allocated to that viewing distance. Report the result value.

              1.4.2.6. Step 6: Repeat the aforementioned steps 4 and 5 for the other viewing distances.

Annex 12
 Test methods and safety provisions for CMS of Classes I
to IV
       1.  Test methods

              1.1.  General specifications

              The Technical Service shall use recognized test methods to check compliance with the requirements defined above in the Regulation. These test methods shall be agreed upon by the Type Approval Authority.

              1.2.  Flicker test

              The entire image area of the monitor shall be free of flicker for at least 90 per cent of the user population. The flicker evaluation uses the determination given in Annex B of ISO13406-2: 2001. The following measurement procedure applies:

              1.2.1. Position the camera of the CMS in front of a still scene (e.g. chessboard chart). Use a scene illumination of about 500 lx. Measure the time resolved luminance value of a portion of the monitor that displays a white patch of the chessboard chart. The measurement location shall be near the centre of the monitor defined size and the measurement direction is perpendicular onto the monitor. Perform a Fourier transform of the luminance-time function for determination of the amount of energy Eobs at various frequencies up to 120 Hz. These numbers are then compared to the amounts of energies that people will detect as flicker, the predicted flicker threshold Epred.

              If Eobs < Epred at every frequency < 120 Hz then it is likely that people will not see flicker.

              If Eobs  Epred at any frequency < 120 Hz then it is likely that people will see flicker.

              1.2.2. Determination of Eobs, which is the observed energy