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 and inspection procedure for a dynamo field resistance unit.
| Identifier | ExFiles\Box 163\6\ img069 | |
| Date | 6th November 1930 | |
| X.7781dr. X.5781dr. (struck through) PRODUCTION TEST AND INSPECTION OF R.R. DYNAMO FIELD RESISTANCE UNIT. (33" of 26 SWG. Eureka wire). A rig should be used with connecting pins on which three resistances can easily be placed so that they are connected in series. (1) Inspection shall be made of the resistance coil turns that they are all spaced equidistantly and not making contact i.e. short-circuiting some of the turns. (2) The terminals of the arrangement should be connected through an ammeter and switch to a 12 volt battery. Voltmeter readings across each of the three resistances should be taken and should all lie within 0.2 volt of one another. The current should lie within the limits 1.4 to 1.6 amperes. (3) After 5 minutes of the above test examine the connections of the resistance wire ends on the tags and ascertain by gentle trial that no weakness has been caused where the two working ends of the wire pass away from the joints. The porcelain also should be gently tapped to enable any possible cracks to assert themselves. Further, see that the brass ferrules are not loose and liable to get twisted round. EFC. | ||