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Reference.org
Vector voltmeter
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<p>A vector voltmeter is a two-channel high-frequency sampling <a href="/facts/Voltmeter/YBHJmMHd">voltmeter</a> that measures phase as well as <a href="/facts/Voltage/EN2po6N2">voltage</a> of two input signals of the same <a href="/facts/Frequency/QUSbPaW8">frequency</a>. </p>