Touch the probes to the positive and negative terminals of the power supply to record the unloaded voltage. Selecting a multimeter with a low impedance setting for voltage tests can prevent inaccurate readings caused by the meter loading the circuit.
Testing Power Supply Under Load Conditions
While the load is active, observe the voltage on the multimeter. For alternating current (AC) supplies, such as those from a wall outlet, select the AC voltage mode.
Learning how to test power supply with multimeter is an essential skill for anyone working with electronics. Power Supply Type Multimeter Setting Expected Measurement DC Adapter DC Voltage (V) Stable value matching label Wall Wart AC Voltage (V) 120V or 230V depending on region Bench PSU DC Voltage (V) Adjustable setting confirmation Testing Under Load Conditions An unloaded reading can be misleading, as voltage often drops when current is drawn.
Testing Power Supply Under Load Conditions
Additionally, measuring the resistance of fuses and cables can identify breaks or corrosion that might not be visible during a visual inspection. Ensure the device is disconnected from the wall outlet before opening any casings or accessing terminals.
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