Definition of vacuum-tube voltmeter
: a voltmeter employing vacuum tubes and useful because of its very high input impedance 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.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/vacuum-tube%20voltmeter. Accessed 20 May. 2022.
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