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This Test Procedure covers instructions for conducting and reporting the more generally applicable and acceptable tests to determine the performance characteristics of direct-current tachometer generators. Direct-current tachometer generators are used for a variety of indicating and control purposes and a characteristic of primary importance in one application may be of little or no importance in another. This Procedure shall not be interpreted or construed as requiring the making of all or any of the tests herein in any given transaction. It is recognized that there may be methods other than those described herein. When more than one method is available, local conditions and the degree of precision desired will determine the method to be used. It is also recognized that tests under or after exposure to unusual environmental conditions are important in some applications but the diversity of these requirements is such that it is not practical to include them at this time.

Electric generators --- Direct current.

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Uniform procedures for the measurement of the power frequency electric field and dc electric field when ac/dc power transmission lines are installed in parallel or on shared towers are established in this recommended practice. Based on the mutual influence analysis between parallel ac/dc power transmission lines through the theoretical calculation and on-site measurements, the specification requirements and calibration methods of electric field meters are specified. The measurement ranges and layout of measurement points, data recording and processing, and result evaluation methods of parallel power transmission lines of different voltage levels are standardized. This recommended practice is applicable to electromagnetic environment measurement of ac transmission lines with a voltage not less than 100 kV, dc transmission lines with a voltage not less than ± 400 kV, and parallel transmission lines with a distance not over 100 m.

Direct current amplifiers.

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Electric machinery --- Direct current.

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Electric generators --- Direct current.

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Direct current amplifiers