Electrical Measurements in Principle and Practice |
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Page 166
... electrodes are usually spheres , and the radius has an optimum value for each voltage . A mean of several readings V FIG . 106. - ELECTROSTATIC PEAK Voltmeter . is necessary , the first spark of a series being that noted . Tem- perature ...
... electrodes are usually spheres , and the radius has an optimum value for each voltage . A mean of several readings V FIG . 106. - ELECTROSTATIC PEAK Voltmeter . is necessary , the first spark of a series being that noted . Tem- perature ...
Page 193
... electrodes , so that the vane is displaced from the centre towards the electrode connected to the faulty main - this is the " eyeball " type . Type A.C.2 . For single - phase alternating current instal- lations with no earth connection ...
... electrodes , so that the vane is displaced from the centre towards the electrode connected to the faulty main - this is the " eyeball " type . Type A.C.2 . For single - phase alternating current instal- lations with no earth connection ...
Page 231
... electrodes are required , as before , one current and one potential . Voltage is read by a thermionic voltmeter with an amplifier or by an arrangement for balancing the voltage against a known adjustable voltage with a differential ...
... electrodes are required , as before , one current and one potential . Voltage is read by a thermionic voltmeter with an amplifier or by an arrangement for balancing the voltage against a known adjustable voltage with a differential ...
Contents
PART I | 1 |
CHAPTER IISTANDARDS ΙΟ | 10 |
in Xray circuits peak r m s and mean readings milli | 17 |
23 other sections not shown
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Common terms and phrases
accuracy adjusted alternating current ammeter ampere-hour ampere-turns amperes angle anode apparatus balance ballistic galvanometer battery cable calibrated capacitance cell circuit comprises condenser conductor connected constant core current transformers cycles per second damping deflection dial direct current disc dynamometer earth electrical electrodes electrostatic voltmeter equal error flux frequency full scale grid high resistance indicating instrument instru insulation resistance lamp linear load magnetic field magnetising maximum means measured megohms ment meter method metre milliammeter milliamperes movement moving coil instrument moving iron instrument mutual inductance necessary null obtained ohmmeter ohms operation oscillograph overload permanent magnet photometer pivoted pointer possible potential divider potentiometer power factor proportional pyrometer r.m.s. value R₁ range ratio reactance reading sensitivity series resistance shows shunt slide wire standard suitable supply switch temperature thermal thermo-couple three-phase torque units usually V₁ V₂ valve variable varying vibration volt-amperes voltage volts wattmeter wave-form Wheatstone Bridge whilst winding zero