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).
Test procedures for a dynamo, including open circuit, load, and insulation checks.
| Identifier | ExFiles\Box 168a\3\ img321 | |
| Date | 8th October 1936 guessed | |
| -4- (6) With the dynamo still in the same hot condition it should be verified that running on open circuit it shows a voltage of 16.0 at not more than 940 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 3,000 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 16.0 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 be easily and quickly taken off. (10) The insulation of the machine should be tested whilst still hot by applying through a low C.P 200 volt lamp an alternating voltage of 500 between the windings and the frame, but the lamp should show no signs of being lighted. | ||