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vacuum-tube voltmeter

noun
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Definition of vacuum-tube voltmeter

: a voltmeter employing vacuum tubes and useful because of its very high input impedence for measurements in circuits (as vacuum-tube circuits) from which only very small currents can be drawn without altering the voltages being measured

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“Vacuum-tube voltmeter.” The Merriam-Webster.com Dictionary, Merriam-Webster Inc., https://www.merriam-webster.com/dictionary/vacuum-tube%20voltmeter. Accessed 12 December 2019.

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