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).
Notes on the measurement of peak potential from an alternating source, referencing an article from a 1919 magazine.
| Identifier | ExFiles\Box 163\7\ img317 | |
| Date | 14th November 1940 | |
| 14.11.40. NOTES ON THE MEASUREMENT OF PEAK POTENTIAL FROM AN ALTERNATING SOURCE. Extract from the Phisosophical Magazine 1919, Vol: 37. page 301. [Circuit Diagram with components labelled V, C, and E] In the circuit shown above, V is a diode rectifying valve. C is a condenser. E is an electrostatic voltmeter. Conditions for Accuracy. 1. Valve must pass no reverse current. 2. Insulation across E must also be such that potential does not fall appreciably between successive peaks. 3. The Insulation across E must also be such that the amount of electricity the source has to supply between successive peaks in order to make up for loss, is not so large as to alter the peak potential recorded. For example, if 1 megohm leak does not affect the peak value of the source, then when the interval between successive peaks is n times the duration of a peak, then n megohms should be minimum resistance across E.{Mr Elliott - Chief Engineer} (Conditions 2. and 3. are fulfilled when the peak potential recorded is independent of the cathode temperature. There is however, a lower limit, below which the recorded peak potential decreases with decreasing cathode temperature, but if 3. is not fulfilled there is no limit above which the recorded peak potential is independent of cathode temperature.) - Continued - | ||