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voltmeter |
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voltmeter, instrument used to measure differences of electric potential potential, electric, work per unit of electric charge expended in moving a charged body from a reference point to any given point in an electric field (see electrostatics ). ..... Click the link for more information. , commonly called voltage, in volts or units that are multiples or fractions of volts. A voltmeter is usually combined with an ammeter ammeter (ăm`mē'tər), instrument used to measure the magnitude of an electric current of several amperes or more. ..... Click the link for more information. and an ohmmeter ohmmeter (ōm`mē'tər), instrument used to measure the electrical resistance of a conductor. ..... Click the link for more information. in a multipurpose instrument. Most voltmeters are based on the d'Arsonval galvanometer galvanometer (găl'vənŏm`ətər) ..... Click the link for more information. and are of the analog type, i.e., they give voltage readings that can vary over a continuous range as indicated by a scale and pointer. However, digital voltmeters, which provide voltage readings that are composed of a group of digits, are becoming increasingly common. Since an oscilloscope is capable of giving a calibrated visual indication of voltage, it can be called a voltmeter. See also potentiometer potentiometer. 1 Manually adjustable, variable, electrical resistor. It has a resistance element that is attached to the circuit by three contacts, or terminals. ..... Click the link for more information. . |
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The digital voltmeter portion of the data was obtained by measuring -[DELTA][R. The sample applications highlight functionality such as RS-232 to Ethernet conversion, RS-485 to Ethernet conversion, Ethernet to Serial Conversion, data gathering from serial devices such as the included temperature sensor, digital voltmeter (not included), and web-enabling applications. A power supply (Bertan, model 205B-10R) was used for the center rod voltage of the NDMA after calibration with a resistive voltage divider and a standard digital voltmeter, which is used at NIST for calibrating DMA voltages over the range of 10 000 V to 10 V. |
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