How to Make Advanced Measurements With a Multimeter

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How to use the Non-Contact Voltage detector

The Non-Contact Voltage (NCV) function allows you to sense AC power in a circuit or wire without having to electrically connect to it.
The NCV sensor sits inside the plastic nub at the top of the iFixit multimeter. The metal strip inside acts as an "antenna" that detects the electromagnetic field generated by an AC source. This field gets stronger the closer it is to the source.
The NCV won't detect whether there's DC power in a circuit or wire.
The NCV may not always detect a live circuit or wire. For safety reasons, never rely on the NCV as your sole point of information if you're working above 20V AC.
The iFixit multimeter's NCV function detects ~45V AC and above.
To use the NCV function, turn the function dial to the NCV mode.

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