Document ID: chunk:federal_register_of_legislation:F2024L00446:reg:9:p37
Version: federal_register_of_legislation:F2024L00446
Segment Type: reg
Provision Reference: reg 9 (pt 37/37)
Character Range: 1880621–1882246

used for the calculation in paragraph 6. of this annex.
              6.5.8. Soak
              After the hot soak evaporative emissions test, the test vehicle shall be soaked for not less than 6 hours and not more than 36 hours between the end of the hot soak test and the start of the diurnal emission test. For at least the last 6 hours of this period the vehicle shall be soaked at 20 °C ±2 °C.
              6.5.9. Diurnal testing

              6.5.9.1. The test vehicle shall be exposed to two cycles of ambient temperature in accordance with the profile specified in Table C3/1 with a maximum deviation of 2 °C at any time. The average temperature deviation from the profile, calculated using the absolute value of each measured deviation, shall not exceed 1 °C. Ambient temperature shall be measured and recorded at least every minute. Temperature cycling shall begin at time Tstart = 0, as specified in paragraph 6.5.9.6. of this annex.

              Table C3/1
              Diurnal ambient temperature profiles
Diurnal ambient temperature profile for the calibration
of the enclosure and the diurnal emission test            Alternative diurnal ambient temperature profile for the calibration of the enclosure.
Time (hours)                                              Temperature                                                                                          Temperature
                                                           (°Ci)                                                                                 Time (hours)   (°Ci)
Calibration                                               Test