From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Continued list of testing procedures for a dynamo, including checks for voltage, noise, and insulation.
| Identifier | ExFiles\Box 70\4\ scan0047 | |
| Date | 20th February 1925 guessed | |
| -3- Contd. (6) With the dynamo still in the same hot condition, it should be verified that running on open circuit shows a voltage of at least 13.6 at 540 [struck through 550] r.p.m. (7) The dynamo shall again be run on load and its speed varied up and down with a view to testing for mechanical and electrical noise. (8) The dynamo shall now be run up to 3600 r.p.m. still on load, and shall show no abnormal brush sparking. Further, the mechanical vibration due to any want of balance shall not be excessive. (9) Examine also for rubbing armature, slack bearings, cracked insulation, etc. (10) The insulation of the machine should be tested while still hot by applying through a low c.p. 200 volt lamp an alternating voltage of 200 between the windings and the frame, when the lamp should show no sign of being lighted. EFC. | ||