Without a healthy power source, even the most sophisticated components will fail to function correctly. Plug the test leads into the correct ports—usually the black lead into the common (COM) port and the red lead into the voltage input port.
Assessing Power Supply Response Time Under Load
A buzzing transformer or a burning smell usually indicates a catastrophic failure. 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. This reveals whether the PSU can deliver its maximum rated amperance.
Measuring Power Supply Response Time Under Load
The goal of testing is to confirm that the output matches these specifications under various load conditions. If you are testing a live circuit, use insulated probes and verify your multimeter is set to the correct function and range.
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