Summary of verification procedures for chassis dynamometers.

§ 1066.215 Summary of verification procedures for chassis dynamometers.

(a) Overview. This section describes the overall process for verifying and calibrating the performance of chassis dynamometers.

(b) Scope and frequency. The following table summarizes the required and recommended calibrations and verifications described in this subpart and indicates when they must occur:

Table 1 of § 1066.215—Summary of Required Dynamometer Verifications

Type of verification Minimum frequency a
§ 1066.220: Linearity verificationSpeed: Upon initial installation, within 370 days before testing, and after major maintenance. Torque (load): Upon initial installation and after major maintenance.
§ 1066.225: Roll runout and diameter verificationUpon initial installation and after major maintenance.
§ 1066.230: Time verificationUpon initial installation and after major maintenance.
§ 1066.235: Speed measurement verificationUpon initial installation, within 370 days before testing, and after major maintenance.
§ 1066.240: Torque (load) transducer verificationUpon initial installation, within 7 days of testing, and after major maintenance.
§ 1066.245: Response time verificationUpon initial installation, within 370 days before testing, and after major maintenance.
§ 1066.250: Base inertia verificationUpon initial installation and after major maintenance.
§ 1066.255: Parasitic loss verificationUpon initial installation, after major maintenance, and upon failure of a verification in § 1066.270 or § 1066.275.
§ 1066.260: Parasitic friction compensation verificationUpon initial installation, after major maintenance, and upon failure of a verification in § 1066.270 or § 1066.275.
§ 1066.265: Acceleration and deceleration verificationUpon initial installation and after major maintenance.
§ 1066.270: Unloaded coastdown verificationUpon initial installation, within 7 days of testing, and after major maintenance.
§ 1066.275 Dynamometer readiness verificationUpon initial installation, within 1 day before testing, and after major maintenance.
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