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 inspection and test procedure for a 40/50 Dynamo Field Resistance Unit.
| Identifier | ExFiles\Box 163\6\ img155 | |
| Date | 15th June 1931 | |
| PRODUCTION INSPECTION AND TEST OF 40/50 DYNAMO FIELD RESISTANCE UNIT. Type - Active length 23" of 26 S.W.G. Eureka wire. ------------- A rig should be used with connecting pins on which a convenient number of 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 a switch, resistance and ammeter to a battery. With the current in the circuit adjusted to 1.0 ampere, voltmeter readings across each of the resistances should be taken, and should all lie within the limits of 1.6 and 1.7 volts. (3) The current should then be raised to 2.0 amperes at which value it should be maintained for 5 minutes. (4) At the end 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. HE/CAP. | ||