Programmable electronic DC operates in seven load modes

Multiple operating modes are available with the SFL series of programmable electronic DC loads from TDK-Lambda. The series comprises 300 and 1,000W power levels and either a 120 or 500V maximum rating.

The SFL series incorporates high speed current feedback control to eliminate load current over-shoot and oscillation to generate a stable and predictable load waveform during turn on or dynamic operation, said TDK-Lambda.

The unit is capable of operating in seven load modes and four operating modes. As a result, the user can perform up to 17 types of load tests on DC power supplies, fuel cells, solar cells, batteries and components to characterise performance.

The loads can be programmed for constant current, constant resistance, constant power, external control, short circuit, and constant voltage with a current limit load types. The operating modes are normal, pulsed load (dynamic time and frequency), complex waveform generation and sweep to test and determine a product’s voltage-current characteristics, over-current or power limit performance. The SFL also offers high speed current control, eliminating load current over-shoot and oscillation, low voltage operation, no turn-on delay and linear operation from 0V.

Load current rise and fall times (slew rate) can be controlled up to 30A per micro second and the internal memory can store and recall eight different load settings. The isolated trigger output signal is used for pulsed load waveform capture on a storage oscilloscope or test equipment synchronisation.

Up to 10 units may be paralleled in a master-slave arrangement for higher power load requirements using a unit-to-unit RJ45 Ethernet cable. Multiple SFL loads can also be connected to separate devices using that cable for synchronised load control and dynamic operation.

Standard control methods include an 89mm colour LCD front panel display, a remote analogue EXT interface and a remote digital USB (2.0) interface. There is an optional rear panel IEEE (488.1) interface (with a built-in DIDO Interface for PLC interfacing) available, as well as an output ripple and noise measurement interface allowing measurements without the need for an oscilloscope.

A wide range 85 to 264V AC input ensures the SFL series can be used worldwide. The loads have built-in protection features and indicator signals, including over-current, power limit, over-temperature, over-voltage protection and reverse connection.

The operating ambient temperature is 0 to +40 degrees C. The 300W model measures 215 x 420 x 128.6mm (3U) and the 1,000W measures 430 x 450 x 128.6mm (3U). The product weights are 6.5kg and 13kg, respectively and have side-mounted handles for carrying. Both front and rear load connections are available, and accessories can be purchased for 19-inch rack mounting.

The SFL series carries a two-year warranty and is compliant to IEC/EN 61010-1 for safety and to EN61326-1: 2013 (Class A) for EMC. The products are also CE and UKCA-marked.

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