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voltmeter |
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voltmeterInstrument for measuring the potential difference (voltage) between two points in a circuit. It should not be confused with an ammeter, which measures current. A voltmeter has a high internal resistance (so that it passes only a small current), and is connected in parallel with the component across which potential difference is to be measured – that is, the current divides and passes through both the voltmeter and the component at the same time. A common type of voltmeter is constructed from a sensitive current-detecting moving-coil galvanometer placed in series with a high-value resistor (multiplier). To measure an AC (alternating current) voltage, the circuit must usually include a rectifier; however, a moving-iron instrument can be used to measure alternating voltages without the need for such a device. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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| If a high frequency oscilloscope is not available, a common digital voltmeter may be used to check for the presence of the bearing currents. instant decode of embedded bus transactions (including I2C, SPI, ASYNC, CAN, USB low and full speed, I2S, SM-Bus, PS/2 and 1-Wire), digital voltmeter, data logger, digital signal generator, Non-Linear Systems was founded in 1952, by Andrew Kay, the inventor of the digital voltmeter. |
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