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A VTVM (vacuum tube voltmeter) is a type of voltmeter that uses vacuum tubes to amplify the input signal. This allows it to have a much higher input resistance than a multimeter, which is a type of voltmeter that does not use vacuum tubes.
The input resistance of a voltmeter is the resistance that it presents to the circuit being measured. This resistance can affect the measurement, as it can cause a voltage drop across the circuit. The higher the input resistance, the less the voltage drop will be, and the more accurate the measurement will be.
A VTVM has a much higher input resistance than a multimeter, which means that it will cause less of a voltage drop across the circuit being measured. This makes it
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