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).
Page detailing an electrical testing procedure for a distribution board, dynamo, and cutout, including specific voltage and amperage readings.
| Identifier | ExFiles\Box 65\2\ scan0171 | |
| Date | 31th January 1929 guessed | |
| -2- Contd. volt low c.p. lamp between these points. Make a similar test between the frameworks of the green lamp switch and cutout. Also between the insulated fixed contact carrier and frame of green lamp switch. (3) The distribution board, mounted in a vertical plane, as on chassis, shall then be connected up by low resistance wires to an R.R. dynamo, a 12 volt battery of suitable capacity, two ammeters A₁ and A₂, a voltmeter V, and carbon plate resistance R according to the diagram herewith, first connecting terminal C of the distribution board to terminal T₁ of ammeter A₂ and leaving terminal B disconnected. Ammeters A₁ and A₂ should provide a 15 ampere and 1.5 ampere range respectively. (4) The distribution board being in a cold condition the dynamo shall be driven at a gradually increasing speed until the cutout is just operated. The instant of operation will be shown by a movement of the needle of ammeter A₁. The reading of the voltmeter V and the ammeter A₂ immediately preceding this instant shall be noted. The former shall lie between the limits 12.2 and 12.8 volts and the latter must not exceed .20 ampere. If the cold operating voltage does not fall within these limits a slight adjustment of the control spring of the contact lever should be made and the adjusting nut securely locked. (5) The dynamo shall now be speeded up to allow a charging current of 10 or more amperes to flow into the battery for five minutes. the carbon resistance R being | ||