How to use a multimeter to measure the current of a charger
The current direction of the charger is from positive to negative, and most of the red lines in the output line are positive. When measuring, place the multimeter in the DC gear, string a high-power resistor with the negative wire of the charger, connect the red lead of the multimeter to the red wire, and connect the black lead to the other end of the resistor to measure. Note that if the multimeter displays 1, it means the range is small and the gear should be adjusted up
1, For measuring current, I prefer a clamp type multimeter. This type of multimeter can be set to the current level and the wires can be clamped into the ring ring. However, please note that the inserted cable must be a single cable. If it is single-phase electricity, one of the live wire L or the neutral wire N is stuck, and cannot be stuck in the ring at the same time. Chargers L and N are both glued together wires. To measure current, you need to separate the wires first. To avoid damaging the original rubber, you can connect two wires at the plug and then connect a plug at the other end of the wire.
2, For other ordinary multimeter measurements, the charging plug and the zero time plug still need to be connected. Just cut one of the live or zero wires, and connect the two ends of the cut wire to the red and black probes. When measuring the current, turn the multimeter to the current position, then turn it on and check the reading. This method, as is often said, when measuring current with a multimeter, it needs to be connected in series to the circuit. That's it.
The statement "measuring charger current with a multimeter" is not rigorous, and the maximum output current marked on the charger is a parameter in production design.
If a multimeter is used to measure the charging current of a charger, it means disconnecting one of the positive or negative wires under load, and then connecting a multimeter set to the DC current level in series to measure the disconnection point.
The multimeter measures direct current, and the wiring principle is to allow the current to flow in from the red probe and out from the black probe; Measure current in series and voltage across.
There are two ways to measure the current of a charger using a multimeter. One is to measure the AC current at the input end, disconnect the two wires L or the neutral wire N at the input end, set the multimeter to the AC current position, gradually decrease from the high position to avoid low gear burning the multimeter until accurate current is measured. The method for measuring DC output is the same as stopping, except that the multimeter is set to the DC gear. Not just explaining clearly?
