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You can easily check for weak or unstable power right at home using a multimeter. After just a few minutes of measuring the voltage, you will be able to determine whether the power supply is experiencing a voltage drop or if the issue lies with the wiring, the outlet, or the appliance itself.

"Silent capacitor burnout" refers to a phenomenon where a start capacitor gradually loses capacitance without exploding or emitting smoke, making it difficult for the user to detect the issue until the motor has sustained severe damage. The appliance continues to operate but runs sluggishly, overheats, and consumes twice the normal amount of electricity. Without periodic inspections, a component costing only a few tens of thousands of dong could force you to replace the entire motor, air conditioner compressor, or ceiling fan an expense running into the millions.

An analog multimeter can still be used to quickly check if a capacitor is shorted, open-circuited, or capable of charging and discharging. However, if precise capacitance measurement or an assessment of capacitor quality is required, a digital multimeter or LCR meter will yield more reliable results

By simply measuring the rotational speed (RPM) and comparing it against design specifications or historical maintenance data, engineers can detect signs of belt slippage, speed reduction, or power loss without needing to disassemble the motor

Measuring pump shaft speed helps determine the equipment's actual rotational speed (RPM), allowing for comparison against design specifications to detect issues such as belt slippage, incorrect gear ratios, abnormal motor operation, or failure to achieve the desired flow rate. Depending on operating conditions, engineers may choose a laser tachometer, a contact tachometer, or a stroboscope