Use a multimeter to measure the quality of the power adapter

1.What is a multimeter?
A multimeter is a multifunctional electrical measuring instrument that can measure parameters such as AC voltage, DC voltage, current, and resistance. It typically consists of a digital display screen and multiple measurement gears, making it easy to use and suitable for various electrical measurement tasks.

2.How to use a multimeter to measure the quality of a power adapter?
The steps are as follows:
-Inserting and unplugging adapter plugs: First, insert the adapter plug into the socket and pay attention to safety during insertion and unplugging.
-Select the correct measurement gear: Select the corresponding measurement gear based on the rated voltage range of the adapter to ensure accurate measurement.
-Measure voltage: Connect the positive and negative symbols of the multimeter to the positive and negative terminals of the adapter, and read the voltage value on the display screen.

3.How to judge the quality of the power adapter?
-Is the output voltage stable: A good power adapter should be able to provide stable voltage output within the rated voltage range. When using a multimeter for measurement, it can be observed whether the measurement result is within the rated voltage range of the adapter and does not change much.
-Whether the output current meets the requirements: The rated output current of the adapter should be able to meet the needs of the connected equipment. If the current value measured by the multimeter exceeds the required current of the device, the adapter quality may be better. Otherwise, there may be a problem.
-Is there a leakage current? A qualified power adapter should be able to avoid leakage. A multimeter can be used to measure the leakage current value of the power adapter at rated voltage. If there is obvious leakage, attention should be paid to safety issues.

When using a multimeter to measure the quality of a power adapter, we can understand the output voltage, current, and leakage current of the adapter to determine whether it meets safety standards. Through these measurements, we can choose a safe and reliable power adapter to avoid damage and safety hazards to our electronic devices caused by the use of low-quality adapters.