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).
List of test procedures for a dynamo, covering mechanical noise, load, vibration, and insulation.
| Identifier | ExFiles\Box 168a\3\ img098 | |
| Date | 17th June 1938 guessed | |
| (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 5,000 r.p.m. still on load, the field resistance being progressively increased as the speed increases, and shall show no abnormal brush sparking when delivering 15 amperes at 13.0 volts. Further, the mechanical vibration due to any want of balance shall not be excessive. (9) Examine also for rubbing armature, slack bearings cracked insulation and final conditions of commutator and brush surfaces, and see also that with the dynamo hot the end cover can easily put on and taken off. (10) The insulation of the machine should be tested whilst still hot by applying through a low C.P. 200 volts lamp and alternating voltage of 200 between the windings and the frame, when the lamp should show no signs of being lighted. | ||