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).
Production test procedure for an ignition coil.
| Identifier | ExFiles\Box 70\4\ scan0024 | |
| Date | 9th June 1928 | |
| X.5781 cl. PRODUCTION TEST OF IGNITION COIL. X.5710. (22 S.W.G. PRIMARY 18,000 TURN SECONDARY) (D.{John DeLooze - Company Secretary} 70346). (1) Continuity of primary and secondary circuits shall be tested by applying an approx. A.C. voltage of 200 to the secondary, when a small 4 volt lamp connected across the primary should be lighted. (Care should be taken to secure a definite metallic connection to the high tension terminal of the secondary winding). (2) Now test for short circuited turns, etc. in either secondary or primary, by inserting a Weston A.C. milliammeter in the supply circuit, when the milliamperes of current taken by the secondary winding, with the primary open circuited, should not exceed the limit 16.5. (3) The high tension terminal is now connected to the central terminal of an R.R. chassis distributor, it being supposed that the distributor is already connected in sequence to six spark gaps. The primary of the coil is connected up in series with a 12 volt battery, a standard double ballast resistance (39" of 33 S.W.G. nickel wire), switch, ammeter, and an R.R. contact breaker with standard condenser (.275 to .325 microfarad at 180C) across its contact points, the make ratio of these latter being set to .55. This make ratio should be periodically checked. A convenient way of doing this is to keep a small resistance made up non-inductively, which, when placed in circuit with the 12 volt battery, ammeter, and contact breaker, Contd. | ||