To test the quality of the DC-DC isolated power module, you can take the following steps:
First, check the exterior of the module for visible damage or burn marks.
Then, use a multimeter to measure whether the input and output voltages are within the specified range.
Next, check the module for abnormal noises or vibrations. In addition, you can use an oscilloscope to observe whether the output waveform is normal.
Finally, the module is connected to the load and tested for stability and efficiency. If the module is abnormal during the above tests, it may need to be replaced or repaired.