In order to make accurate measurements of reference voltages, the voltmeter must have an input impedance of at least:
A) 100 Ω
B) 1 MΩ
C) 10 MΩ
D) 100 MΩ

Question

Quizplus · Accepted Answer

To ensure accurate measurements of reference voltages, the voltmeter should have a high input impedance to minimize the loading effect on the circuit being measured. An input impedance of at least 10 MΩ is generally considered sufficient for most applications to avoid significant measurement errors due to the voltmeter drawing current from the circuit.

In Order to Make Accurate Measurements of Reference Voltages, the Voltmeter