When troubleshooting electronic equipment, why should you use a high impedance multimeter?
Official USCG Answer & Rule Citation
Correct Answer: Option D — so as not to load down the circuit and obtain erroneous voltage readings
High input impedance multimeters draw minimal current from the circuit under test, preventing circuit loading or voltage drops. Per IEEE 45 marine electrical practices, using high impedance meters is essential to obtain accurate voltage measurements without altering sensitive electronic circuit operations.
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