The detection methods for power adapters mainly include the following:

1. Output voltage test: Use measuring instruments such as a multimeter or voltmeter to connect the positive pole of the measuring instrument to the positive pole of the power adapter, and the negative pole to the negative pole of the power adapter. Then, insert the power adapter into the power supply and turn on the switch to read the voltage value on the measuring instrument. Ensure that the measured voltage is close to the nominal voltage of the adapter and within the allowed range.

2. Output current test: Use measuring instruments such as a multimeter or ammeter to connect them in series in the circuit. The multimeter should be set to the DC current range, and the red probe of the multimeter should be inserted into the current test hole. Insert the power adapter into the power supply and turn on the switch to read the current value on the measuring instrument. Ensure that the measured current is close to the nominal current of the adapter and within the allowed range.

3. Stability and load testing: Test the stability and load capacity of the adapter by connecting electronic devices. When the device is running normally, load tools (such as load resistance boxes) can be used to simulate different load conditions to verify the stability of the adapter under different loads.

4. Appearance inspection: The surface of the high-quality power adapter is smooth, and the label is clear. The quality of the power adapter can be judged by checking for damage, deformation, cracks, and other conditions.

5. Check the power indicator light: After inserting the power adapter, observe the condition of the power indicator light to determine whether the adapter is working properly.

In addition, electronic load machines, power meters, oscilloscopes, and other equipment can also be used for more in-depth testing. However, please note that during these tests, it is necessary to ensure the safety of the testing environment and avoid dangerous situations such as electric shock. If you are not familiar with testing methods, it is recommended to seek professional assistance.