Galvanometers, Electromechanical Voltmeters, and Ammeters
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Thermal Converters as AC-DC Transfer Standards for Current and Voltage Measurements at Audio Frequencies
Thermal converters and associated equipment that are used as ac-dc transfer standards at the National Bureau of Standards for the precise measurement of current and voltage at power and audio frequencies are described. The standards and the equipment are primarily used to standardize a-c ammeters and voltmeters submitted to the Bureau for certification. The ac-dc transfer may be made with these...
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This circuit is probed by two voltmeters as sketched in the righthand figure above. Each voltmeter consists of a resistor R R1, R2 and an ammeter that measures the currents Ii and reports the “voltage” Vmeter,i = IiR. 3 The “positive” leads of the voltmeters are connected to points a and c, such that the directions of currents I1 and I2 are as shown when positive. The paradox is that Vmeter1 do...
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The instruments which have been used heretofore for the observation of nerve action currents have been galvanometers of the moving coil or magnet type with or without the aid of a rheotome, the capillary electrometer and the string galvanometer. Each of these instruments possesses considerable inertia. The slower galvanometers are unaffected by single action currents and give a sustained deflec...
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تاریخ انتشار 2011