The LD300 electronic load from TTi offers an alternative to passive loads constructed in-house. TTi has now updated the LD300 to improve its performance at high currents. A low-voltage dropout function is also provided to protect battery sources from damaging discharge levels.
The LD300 has maximum input levels of 80 A and 80 V, with a maximum power dissipation of 300 W at 40°C or 360 W at 25°C. Load conditions are displayed by 4-digit meters. The source voltage can be sensed either at the terminals or at the load. A current monitor output provides a voltage proportional to the current for viewing with an oscilloscope or external meter.
The unit has five operating modes: constant current, constant voltage, constant power, constant resistance, and constant conductance. Parameter values are set by 10-turn controls on the front panel. Alternatively, the load level can be set by an external control voltage. Any desired waveform can be applied to simulate complex load conditions.
An internal transient generator can repeatedly switch the load between two levels. The frequency and duty cycle can be set over a wide range. The transients can also be initiated by an external logic signal. The transitions between the levels have a true linear slewing characteristic in all modes, with the slew rate adjustable over a wide range.
The LD300 is fully protected against excessive current, power dissipation and internal temperature. It is housed in a compact case measuring 130 x 212 x 435 mm (half rack width, 3U height) with a weight of 6 kg.
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