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 report detailing the electrical properties of windings, including resistance, impedance, and circuit tests.
| Identifier | ExFiles\Box 163\7\ img127 | |
| Date | 10th October 1930 guessed | |
| -2- (1) Continuity of windings :- OK (2) Quantities :- Primary resistance 4.15 ohms at 18.5°C. Ballast " coil designed to work without ballast. Secondary " 4050 " " 18.5 " Primary impedance at 50 cycles. 7.32 " Secondary -ditto- 15500 " " " Primary inductance .0191 henries Secondary " 47.5 " (3) Open circuit test :- (4) Open secondary circuit primary current :- .72 amperes Short " " " :- .94 amperes (5) (a) Secondary resistance after test :- 5960 ohms. Corresponding temperature :- 139 °C. Primary current at end of test :- .97 amperes Ambient temperature :- 20 °C. (b) Secondary resistance after test :- 6275 ohms. Corresponding temperature :- 159 °C. Primary current at end of test :- 1.63 amperes Ambient temperature :- 21 °C. Secondary resistance at 0°C. = 3760 ohms. | ||