If your product relies on stable voltage and current delivery, routine power supply current measurement should be part of your process—especially before deployment or shipment. The most common method for measuring current is to place a multimeter in series with the circuit.
For best results, aim for a reading where the digits are active and not all zeros. This gives better accuracy and makes the data more useful in analysis. For repeated testing in a fixed circuit, placing a resistor of known value in series with the load can be a convenient and effective technique for power supply current measurement.
A power supply is a component, subsystem, or system that converts electrical power from one form to another; commonly from alternating current (AC) utility power to direct current (DC) power.
Using the measurement techniques described in this application note, accurate power measurements can be made using high-performance current probes (plus voltage probes) and a compatible oscilloscope, when proper setup techniques are applied.
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