Document ID: chunk:federal_register_of_legislation:F2023L00129:reg:10:p16
Version: federal_register_of_legislation:F2023L00129
Segment Type: reg
Provision Reference: reg 10 (pt 16/150)
Character Range: 758693–761752

declared void.
       A.1.2.6.3. Test end

              Test end is reached when the vehicle has completed the trip and the internal combustion engine is switched off.

              The internal combustion engine shall be switched off as soon as practicable at the end of the trip. Data shall continue to be recorded until the response time of the sampling systems has elapsed."

              A.1.2.7. Verification of the measurements
              A.1.2.7.1. Checking of the analysers
              The zero, span and linearity checks of the analysers as described in paragraph A.1.2.5.3. shall be performed using calibration gases meeting the requirements of paragraph 9.3.3. of Annex 4.
              A.1.2.7.2. Zero drift
              Zero response is defined as the mean response, including noise, to a zero gas during a time interval of at least 30 seconds. The drift of the zero response shall be less than 2 per cent of full scale on the lowest range used.
              A.1.2.7.3. Span drift
              Span response is defined as the mean response, including noise, to a span gas during a time interval of at least 30 seconds. The drift of the span response shall be less than 2 per cent of full scale on the lowest range used.
              A.1.2.7.4. Drift verification
              This shall apply only if, during the test, no zero drift correction was made.
              As soon as practical but no later than 30 minutes after the test is complete the gaseous analyser ranges used shall be zeroed and spanned to check their drift compared to the pre-test results.
              The following provisions shall apply for analyser drift:
                  (a) If the difference between the pre-test and post-test results is less than 2 % as specified in paragraphs A.1.2.7.2. and A.1.2.7.3., the measured concentrations may be used uncorrected or shall, at the request of the manufacturer, be corrected for drift according to paragraph A.1.2.7.5.;"
                  (b) If the difference between the pre-test and post-test results is equal to or greater than 2 per cent as specified in paragraphs A.1.2.7.2. and A.1.2.7.3., the test shall be voided or the measured concentrations shall be corrected for drift according to paragraph A.1.2.7.5.
              A.1.2.7.5. Drift correction
              If drift correction is applied in accordance with paragraph A.1.2.7.4., the corrected concentration value shall be calculated according to paragraph 8.6.1. of Annex 4.
              The difference between the uncorrected and the corrected brake-specific emission values shall be within ±6 per cent of the uncorrected brake-specific emission values. If the drift is greater than 6 per cent, the test shall be voided. If drift correction is applied, only the drift-corrected emission results shall be used when reporting emissions.
       A.1.2.7.6. Checking the PM number analyser

              The zero level of the PM number analyser shall be checked before test start and after test end and recorded in accordance with the requirements