N621 High Performance Benchtop DC Electronic Load

On the N621, impedance simulation and short-circuit simulation are supported. A 4.3-inch LCD screen, professional test software, and optional fast-charging test module support common power-electronics workflows.

Options to settle before the order

The N621 fast-charge protocol module is optional and offered on supported models, so the protocol set - USB PD2.0/PD3.0/PD3.1, QC, PE, FCP, SCP, AFC and VOOC - is a model decision rather than a firmware setting. OCP, OVP and OPP on the N621 are test modes that drive a supply until its own protection acts, which is a different question from the limits the load holds on itself. For LED driver work the LED simulation mode matters more than the power rating, because a plain resistive load does not reproduce the forward-voltage knee that a driver’s control loop regulates against. Above 600 V or 600 W the choice leaves the benchtop class for a rack-mounted high-power load.

Sizing an N621 against the DUT

An electronic load is bounded by voltage, current and power at once: an N621 has to clear its 80 V, 150 V or 600 V class, its ceiling of up to 60 A and its 150 W, 300 W or 600 W rating at one operating point, and the lowest of the three binds. Choose the voltage class from the supply’s open-circuit and transient voltage rather than from its nominal output, because the class is fixed when the model is chosen and the rest of the range is not. At currents approaching 60 A the resistance of the load leads becomes part of what the bench reads, so conductor gauge and terminal torque belong in the test plan.