Electrical Measurements in Principle and Practice |
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Page 41
... Moving coil instruments , when properly designed , should be very dead beat , the damping action of eddy currents induced in the aluminium former when the movement is deflected having the effect of checking its motion . The zero is ...
... Moving coil instruments , when properly designed , should be very dead beat , the damping action of eddy currents induced in the aluminium former when the movement is deflected having the effect of checking its motion . The zero is ...
Page 55
... coil giving the lowest VA consumption . For the usual switchboard ... moving coil instru- ment . Such shunts are of value for range ... instrument results which is particularly useful as a transfer instrument ELECTROMAGNETIC INSTRUMENTS 55.
... coil giving the lowest VA consumption . For the usual switchboard ... moving coil instru- ment . Such shunts are of value for range ... instrument results which is particularly useful as a transfer instrument ELECTROMAGNETIC INSTRUMENTS 55.
Page 157
... instrument . I N - I times the Whilst moving coil instruments are general , other types can be used ; their particular advantages and disadvantages are given below . ( Also see Frontispiece . ) Dynamometer . Can be as accurate as a moving ...
... instrument . I N - I times the Whilst moving coil instruments are general , other types can be used ; their particular advantages and disadvantages are given below . ( Also see Frontispiece . ) Dynamometer . Can be as accurate as a moving ...
Contents
CHAPTER IISTANDARDS ΙΟ | 10 |
CHAPTER IIIACCURACY CONSIDERATIONS | 19 |
PART II | 29 |
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Common terms and phrases
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