§ 1065.790 - Mass standards.

§ 1065.790 Mass standards.

Cross Reference

Link to an amendment published at 88 FR 4687, Jan. 24, 2023.

(a) PM balance calibration weights. Use PM balance calibration weights that are certified as NIST-traceable within 0±0.1% uncertainty. Calibration weights may be certified by any calibration lab that maintains NIST-traceability. Make sure your highest calibration weight has no greater more than ten times the mass of an unused PM-sample medium.

(b) Dynamometer, fuel mass scale, and DEF mass scale calibration weights. Use dynamometer and mass scale calibration weights that are certified as NIST-traceable within 0±0.1% uncertainty. Calibration weights may be certified by any calibration lab that maintains NIST-traceability.

[70 FR 40516, July 13, 2005, as amended at 76 FR 57467, Sept. 15, 2011; 86 FR 34574, June 29, 2021[88 FR 4687, Jan. 24, 2023]