U.S. Code of Federal Regulations
Regulations most recently checked for updates: May 30, 2023
The measurement instrument calibration and verification requirements in 40 CFR part 1065, subpart D, apply with the following exceptions:
(a) The calibration and verification provisions of 40 CFR 1065.303 do not apply for engine speed, torque, fuel rate, or intake air flow.
(b) The linearity verification provisions of 40 CFR 1065.307 do not apply for engine speed, torque, fuel rate, or intake air flow. Section 1066.135 specifies additional linearity verification provisions that apply specifically for chassis testing.
(c) The provisions of § 1066.220 apply instead 40 CFR 1065.310.
(d) The provisions of 40 CFR 1065.320, 1065.325, and 1065.395 do not apply.
(e) If you are measuring flow volumetrically (rather than measuring based on molar values), the provisions of § 1066.140 apply instead of 40 CFR 1065.340.
(f) The provisions of § 1066.150 apply instead 40 CFR 1065.350(c), 1065.355(c), 1065.370(c), and 1065.375(c).
(g) Table 1 of this section summarizes the required and recommended calibrations and verifications that are unique to testing under this part and indicates when these must be performed. Perform other required or recommended calibrations and verifications as described in 40 CFR 1065.303, with the exceptions noted in this section. Table 1 follows:
Table 1 of § 1066.130—Summary of Required Calibrations and Verifications
|Type of calibration or verification||Minimum frequency a|
|40 CFR 1065.307: Linearity verification||The linearity verifications from 40 CFR part 1065 do not apply under this part for engine speed, torque, fuel rate, or intake air flow; the linearity verification described in § 1066.135 applies for the following measurements:
Dynamometer speed: See § 1066.220.
Dynamometer torque: See § 1066.220.
|40 CFR 1065.310: Torque||This calibration does not apply for testing under this part; see § 1066.220.|
|40 CFR 1065.320: Fuel flow||This calibration does not apply for testing under this part.|
|40 CFR 1065.325: Intake flow||This calibration does not apply for testing under this part.|
|40 CFR 1065.340: CVS calibration||This calibration does not apply for CVS flow meters calibrated volumetrically as described in § 1066.140.|
|40 CFR 1065.345: Vacuum leak||Required upon initial installation of the sampling system; recommended within 35 days before the start of an emissions test and after maintenance such as pre-filter changes.|
|40 CFR 1065.350(c), 1065.355(c), 1065.370(c), and 1065.375(c)||These provisions do not apply for testing under this part; see § 1066.150.|
|40 CFR 1065.395: Inertial PM balance and weighing||These verifications do not apply for testing under this part.|
a Perform calibrations and verifications more frequently if needed to conform to the measurement system manufacturer's instructions and good engineering judgment.