CALIBRATION:
7. Using the entire sampling system, acquire two or more pretest CTS spectra and use them to calculate the system absorption path length Ls(see APPENDIX B, section B1). Use the integration time planned for subsequent sample spectra. Verify that Lsis within 5% of the value quoted in the test plan. Verify that the sample temperature and pressure are within 10 C to 30 C and 96.6 kPa to 103 kPa (725 mmHg to 795 mmHg), respectively.
8. When possible, perform the following system checks before sampling. If necessary, they may be delayed until performance of the (post-testing) quality control procedures (see steps 14.15,16 and 17). If performed after sampling, the results of these procedures may require revision of the test results and LODs.