Electrical Measurements in Principle and Practice |
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Page 291
... lamps . Six groups of lamps were utilised , series I emitting light of the same colour as the pentane lamp and series 6 emitting light of the same colour as the commercial tungsten filament vacuum lamp of that time . As a result of this ...
... lamps . Six groups of lamps were utilised , series I emitting light of the same colour as the pentane lamp and series 6 emitting light of the same colour as the commercial tungsten filament vacuum lamp of that time . As a result of this ...
Page 294
... lamp takes the place of the substandard lamp used for calibration purposes . In the case of electric lamps , accuracy can only be obtained by refine- ment of electrical measurement . For work of the highest precision it is necessary to ...
... lamp takes the place of the substandard lamp used for calibration purposes . In the case of electric lamps , accuracy can only be obtained by refine- ment of electrical measurement . For work of the highest precision it is necessary to ...
Page 299
... lamps having bayonet caps and wattages from 15 to 100. To select the lower or the higher range of voltages a switch is provided near the instru- ment . The A second switch is a lamp selector switch ; this has three positions ; lamp No. 1 , ...
... lamps having bayonet caps and wattages from 15 to 100. To select the lower or the higher range of voltages a switch is provided near the instru- ment . The A second switch is a lamp selector switch ; this has three positions ; lamp No. 1 , ...
Contents
CHAPTER IISTANDARDS ΙΟ | 10 |
CHAPTER IIIACCURACY CONSIDERATIONS | 19 |
PART II | 29 |
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accuracy adjusted alternating current ammeter ampere-hour amperes angle anode apparatus applied balance ballistic galvanometer battery bridge cable calibrated capacitance cell circuit comprises condenser conductor connected constant core cycles per second damping decibel deflection dial direct current disc dynamometer earth electrical electrodes electrostatic voltmeter equal error fault flux frequency galvanometer grid indicating instrument instru insulation resistance lamp length linear load magnetic field magnetising maximum means measured megohms ment meter method metre milliammeter movement moving coil instrument moving iron instrument mutual inductance necessary null obtained ohmmeter ohms operation overload permanent magnet photometer pivots pointer possible potential divider potentiometer power factor practice proportional pyrometer r.m.s. value R₁ R₂ range ratio reactance reading selector switch sensitivity series resistance shows shunt slide wire standard suitable supply temperature test set thermal thermo-couple torque usually V₁ V₂ valve variable varying volt-amperes voltage volts wattmeter wave-form Wheatstone bridge Whilst winding zero