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Electronic Code of Federal Regulations

e-CFR Data is current as of April 14, 2014

Title 40: Protection of Environment
PART 1066—VEHICLE-TESTING PROCEDURES
Subpart C—Dynamometer Specifications


§1066.245   Response time verification.

(a) Overview. This section describes how to verify the dynamometer's response time.

(b) Scope and frequency. Perform this verification upon initial installation and after major maintenance.

(c) Procedure. Use the dynamometer's automated process to verify response time. Perform this test at two different inertia settings corresponding approximately to the minimum and maximum vehicle weights you expect to test. Use good engineering judgment to select road-load coefficients representing vehicles of the appropriate weight. Determine the dynamometer's settling response time, ts, based on the point at which there are no measured results more than 10% above or below the final equilibrium value, as illustrated in Figure 1 of this section. The observed settling response time must be less than 100 milliseconds for each inertia setting.

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