Document ID: chunk:federal_register_of_legislation:F2024C00148:reg:1:p31
Version: federal_register_of_legislation:F2024C00148
Segment Type: reg
Provision Reference: reg 1 (pt 31/34)
Character Range: 220380–223613

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 at every frequency < 120 Hz:

                     where:

                  b0 = 12.45184

                  b1 = -0.16032

                     For Lt , which is the adaption luminance:

              Use from ISO 16505:2015 (subclause 7.8.2: Test 2: Day condition with diffuse sky-light exposure).

              For c0, which is the zero Fourier coefficient, and is the dark-room luminance averaged over time.

                     Use  from ISO 16505:2015

              (see ISO 16505:2015, subclause 7.8.2.: Test 2: Day condition with diffuse sky-light exposure with the diffuse light source switched off).

                     For AMPn:

              For cn, which is the nth Fourier coefficient. Take the nth Fourier coefficient from the Fourier transform.

              1.2.3. Determination of Epred, which is the predicted energy at every frequency < 120 Hz:

              The variables a and b depend on the monitor diagonal as seen from the driver's ocular reference point and is measured in degree (see Table B.1 in the standard ISO 13406-2:2001). For a monitor diagonal  of less than 20°, variables a and b equals to a = 0.1276 and b = 0.1424.

                     The monitor diagonal  is given by the following equation:

                     Where:

                     Diagonal diagonal of the monitor, measured in metres

                      Distance of the ORP to the centre of the monitor coordinate system.

              1.2.4. For every frequency < 120 Hz compare the observed energy Eobs with the predicted energy Epred and report the result value for passed or failed.

              1.3. Point light sources test method

              Figure 1 shows the test arrangement for the point light source test.

                     Figure 1
                     Test arrangement for the point light source test

                  1: Point light source lab model to emulate passing beam headlamp at 250 m
              2: Camera being tested
              3: Monitor being tested
              4: Reference camera
                  5: Optical or spatial isolation between camera and monitor display environment
              6: Camera-side dark environment
              7: Monitor-side dark room environment
              8: LED light diffuser/aligner, according to necessity
              9: Neutral black background

              The point light source lab model is an emulation of a set of vehicle passing beam headlamps at a distance of 250 m with luminous intensity of 1,750 cd, in accordance to the maximum allowance of luminous intensity of a vehicle passing-beam headlamp at point "BR" described in Regulation No. 112, 01 series of amendments. The test is performed considering a set of lamps with 0.09 m diameter and separated by 1.3 m. This results in a luminance of 275,000 cd/m2. For laboratory evaluation purposes the light sources shall be adjusted to have a luminance within the range of 250,000 to 300,000 cd/m2 by using a constant current source.