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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 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 (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.
When testing a power supply in this mode, there is current floating through the electronic load linearly proportional to the input voltage in accordance with the preset resistance. At the same time the use of a combined mode (constant resistance mode changing to direct voltage mode) additionally provides protection to the power supply under test against current surge during the changing process.
There are two distinct components to the output noise. These are commonly referred to as ‘ripple’ and ‘noise’.
Tracking mode is one of multi-channel power supply control modes in which single channel (driving) control means an identical change of the same parameter of another channel (driven), i.e. as a result the parameters of both channels change simultaneously.
In DC voltage mode the power supply will produce current in accordance with the resistance value of the load, at the same time the specified input voltage will stay invariable. The retention of the preset voltage will last until the maximum acceptable current in the load is achieved. As a rule when the current exceeds the norm (current overload) the power supply automatically changes to current stabilization mode. If the power supply is not protected against current overload it will get out of order in case of such overload.