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Design Engineer Valued Creative Encyclopedia

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In DC mode a power supply will produce current in accordance with the specified value regardless of the preset input voltage. If at some point the maximum current of the power supply under test exceeds the set current (the load resistance of the power supply will drop) the voltage of the power supply under test will drop. Typically, for a mode indication there should be LED used with "CC" marking.

Electronic load
Electronic load is an electronic device designed to simulate different operating modes of load while testing power supplies.

When testing a power supply in this mode the electronic load consumes constant power. If the input voltage rises the electronic load decreases the input current therefore the load power (=V * I) stays at the preset level.

Power supply to load four-wire connection method
Power supply to load four-wire (4-wire) connection method is designed for the influence decrease (compensation) of the connecting wires resistance. This feature is rather useful because the resistive value of the wires resistance, when connecting the load, distorts the set output voltage of the power supply.


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