Document ID: chunk:federal_register_of_legislation:F2023L00129:reg:13:p10
Version: federal_register_of_legislation:F2023L00129
Segment Type: reg
Provision Reference: reg 13 (pt 10/56)
Character Range: 321793–324747

until system response times have elapsed.

7.8.2. Verification of proportional sampling

 For any proportional batch sample, such as a bag sample or PM sample, it shall be verified that proportional sampling was maintained according to paragraphs 7.6.7. and 7.7.5. Any sample that does not fulfil the requirements shall be voided.

7.8.3. PM conditioning and weighing

 The particulate filter shall be placed into covered or sealed containers or the filter holders shall be closed, in order to protect the sample filters against ambient contamination. Thus protected, the filter shall be returned to the weighing chamber. The filter shall be conditioned for at least one hour, and then weighed according to paragraph 9.4.5. The gross weight of the filter shall be recorded.
              7.8.4. Drift verification

              As soon as practical but no later than 30 minutes after the test cycle is complete or during the soak period (for (b) only), the zero and span responses of the gaseous analyser ranges used shall be determined. For the purpose of this paragraph, test cycle is defined as follows:

                  (a)            For the WHTC: the complete sequence cold – soak – hot;

                  (b)           For the WHTC hot start test (paragraph 6.6.): the sequence soak – hot;

                  (c)            For the multiple regeneration WHTC hot start test (paragraph 6.6.): the total number of hot start tests;

                  (d)           For the WHSC: the test cycle.

The following provisions apply for analyser drift:
                  (a)            The pre-test zero and span and post-test zero and span responses may be directly inserted into equation 66 of paragraph 8.6.1. without determining the drift;

                  (b)           If the drift between the pre-test and post-test results is less than 1 per cent of full scale, the measured concentrations may be used uncorrected or may be corrected for drift according to paragraph 8.6.1.;

If the drift difference between the pre-test and post-test results is equal to or greater than 1 per cent of full scale, the test shall be voided or the measured concentrations shall be corrected for drift according to paragraph 8.6.1.

7.8.5. Analysis of gaseous bag sampling

 As soon as practical, the following shall be performed:
(a) Gaseous bag samples shall be analyzed no later than 30 minutes after the hot start test is complete or during the soak period for the cold start test;
(b) Background samples shall be analyzed no later than 60 minutes after the hot start test is complete.

7.8.6. Validation of cycle work

 Before calculating actual cycle work, any points recorded during engine starting shall be omitted. Actual cycle work shall be determined over the test cycle by synchronously using actual speed and actual torque values to calculate instantaneous values for engine power. Instantaneous engine power values shall be integrated over the test