part_subject: "CONTROL OF EMISSIONS FROM NEW AND IN-USE NONROAD COMPRESSION-IGNITION ENGINES"
subpart_code: "D"
subpart_subject: "Emission Test Equipment Provisions"
section_number: "89.306"
section_subject: "Dynamometer specifications and calibration weights."
cfr_reference: "40 CFR 89.306"
title_name: "Title 40"
title_subject: "Protection of Environment"
parts_covered: "Parts 87 to 95"
revised_date: "Revised as of July 1, 2017"
publication_date: "As of July 1, 2017"
contains_description: "Containing a codification of documents of general applicability and future effect"
publication_info: "Published by the Office of the Federal Register National Archives and Records Administration as a Special Edition of the Federal Register"
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(a)Dynamometer specifications. The dynamometer test stand and other instruments for measurement of power output must meet the accuracy and calibration frequency requirements shown in table 3 in appendix A of this subpart. The dynamometer must be capable of performing the test cycle described in § 89.410.
(b)Dynamometer calibration weights. A minimum of six calibration weights for each range used are required. The weights must be spaced to reflect good engineering judgement such that they cover the range of weights required and must be traceable to within 0.5 percent of NIST weights. Laboratories located in foreign countries may certify calibration weights to local government bureau standards.