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).
Calibration and resistance data for a Weston A.C. Milliammeter No. 1068.
| Identifier | ExFiles\Box 33\4\ Scan240 | |
| Date | 22th September 1927 | |
| Y1782 WESTON A.C. MILLIAMMETER NO.1068. Resistance of instrument at 16oC = 296 ohms. D.C. or A.C. resistance of 300 V multiplier = 9710 " " " " " " 300 V range = 10006 " D.C. resistance of 100 V multiplier = 2956 " A.C. impedance of 100 V range = 3350 " D.C. resistance of 30 V multiplier = 717 " A.C. impedance of 30 V range = 1024 " Reading. | Milliamperes. | Volts. (300 V range). | Volts. (100 V range). | Volts. (30 V range). --------------------------------------------------------------------------------------------- 10 | 9.88 | 98.9 | 33.4 | 10.08 12 | 11.88 | 118.9 | 40.1 | 12.14 14 | 13.89 | 139.0 | 46.7 | 14.20 16 | 15.89 | 159.0 | 53.4 | 16.26 18 | 17.89 | 179.0 | 60.0 | 18.32 20 | 19.92 | 199.3 | 66.7 | 20.46 22 | 21.96 | 219.1 | 73.5 | 22.55 24 | 24.00 | 240.1 | 80.0 | 24.60 26 | 26.05 | 260.7 | 86.6 | 26.65 28 | 28.11 | 281.3 | 93.4 | 28.79 30 | 30.18 | 302.0 | 100.1 | 30.82 EFC. 22.9.27. | ||