Inverter testing primarily includes two parts: static testing and dynamic testing.

Static testing primarily includes the following two aspects:

Rectifier circuit testing. Locate the positive (P) and negative (N) terminals of the internal DC power supply in the inverter, set the multimeter to the X10 resistance range, connect the red probe to the P terminal, and the black probe to the R, S, and T terminals respectively. There should be a resistance of around tens of ohms, and it should be relatively even.

Inverter circuit testing. Connect the red probe to the P terminal, and the black probe to each of U, V, and W respectively. There should be a resistance of several tens of ohms, with the phase resistances being basically consistent. The reverse phase should be infinite.

Dynamic testing should be conducted only after the static testing results are normal. It primarily includes inspecting the contents indicated by the power-on failure and making a basic judgment of the fault and its cause.