## A.C./D.C. Test Meters: Principles, Design and Construction of Instruments of Workshop Grade for Testing Low-power Apparatus |

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a.c. indicator a.c. ranges accuracy adjusted alloys alternating current ammeter amperes applied voltage approx Basic Circuit basic meter calibration capacitance capacitor cell or battery cent characteristics circuit of Fig coil resistance components core loss current passing current sensitivity current transformer curve d.c. scale decibel equation error example flux density full-scale deflection current Hence high-stability carbon type hysteresis induced voltage inductor insulation linear scale low range magnetizing current Manganin measuring merit metal rectifier meter resistance milliammeter movement multi-range instruments Mumetal number of turns obtained Ohmmeter ohms ohms scale panel Permalloy pointer possible potentiometer rectifier resis resistance in circuit resistance ranges resistor scale shape secondary winding selenium series resistance shown in Fig soldering spring ligaments standard switch tance temperature coefficient terminals test instrument tion tolerance total current total resistance type under discussion universal shunt voltage drop voltage ranges voltmeter wire zero