1. Determine the position of the broken core of the wire 【Nuclear phase instrument】
Method: Connect one end of the broken insulated wire to the live wire of the 220V AC power supply, and leave the other end in the air. Turn the digital multimeter to the 2V gear, start from the live wire end, move the red test pen along the insulation sheath of the wire, and the displayed voltage value should fluctuate up and down at a few tenths of a volt. When the red test pen moves to a certain place, the voltage suddenly drops to a few tenths of a volt, indicating that this must be the position of the broken core.

Arány tesztelő gyártók bevezetés kettő csodálatos felhasználások digitális multiméterek % 5bDC magas feszültség generátor]
The AC 20V gear of the digital multimeter, the readings of the two measurements are 6.01V and 0.4V respectively, then the 6.01V terminal is the "hot" line of the power supply, and 0.4V is the change.

2. Distinguish between the "change" money and the "fire" money of the mains electricity
Turn the multimeter to the AC 20V gear, remove the black test lead, hold the szigetelés rúd of the red teszt ólom, és érintés the two holes in the power socket with the tip of the pen in turn. The Small socket hole is the "neutral" wire.