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).
Specification sheet for a Wave Analyser, Type TF.455.
| Identifier | ExFiles\Box 138\1\ scan0306 | |
| Date | 1st January 1938 guessed | |
| 3. SPECIFICATION OF WAVE ANALYSER. TYPE TF.{T. Fisher}455. FREQUENCY RANGE 20 - 15,000 c.p.s. FREQUENCY CALIBRATION ±2% ±10c.p.s. SELECTIVITY The response is down 6 dB{Donald Bastow - Suspensions} at 2 c.p.s; 40 dB{Donald Bastow - Suspensions} at 30 c.p.s. and 60 dB{Donald Bastow - Suspensions} at 90 c.p.s. The selectivity is constant throughout the whole operating frequency range. VOLTAGE RANGE 0.2 millivolts to 200 volts. VOLTAGE ACCURACY ±5% except below 2 mV where the accuracy falls to ±10%. INPUT IMPEDANCE 10,000 ohms. CALIBRATION Means are provided for standardising the calibration at power supply frequencies. POWER SUPPLY Unspillable 2 volt accumulator and 135 volt dry battery. MOUNTING All controls are conveniently disposed on a vertical aluminium panel. The chassis and screens are built on this panel, the whole unit being mounted in a steel case with protective panel bars and twin carrying handles. FINISH Panel: Black crackle lacquer. Case: Grey cellulose enamel. DIMENSIONS 29" long x 16" high x 12" deep (over projections). WEIGHT 35-lbs. (complete with batteries) PRICE See Price Index. | ||