Data Sheet Modular Programmable DC Electronic Load MDL4U Series Features and benefits n Power range up to 2400 W n Voltage range up to 500 V n Current range up to 120 A n CC/CV/CR/CW/CZ operating modes n Removable modules for easy system configurability n Support for up to 16 channels using dual channel modules with mainframe extension n Operate identical modules in parallel mode for high current applications n Synchronous load on/off function USB LAN RS232 GPIB n Standard LAN, GPIB, USB, and RS232 interfaces with USBTMC/SCPI protocol The MDL4U Series is a multi-channel modular DSP technology to simulate non-linear loads and support programmable electronic load system. Seven realistic loading behavior. n Analog current control and monitoring different modules of programmable DC loads ranging in power from 200 W to 600 W Easily edit the loads parameters such as voltage, n Transient mode up to 25 kHz provide users the flexibility to test a wide range current, slew rate, and width via the front panel. n List mode (sequence mode) - minimum 20 s of power sources from multi-output DC Increase productivity by saving your test step width with 84 user programmable steps power supplies to batteries, fuel cells, and parameters into any one of the 101 memory n Adjustable slew rate in CC mode photovoltaic arrays. areas for quick system recall. Additionally, the MDL4U Series provides 16-bit resolution as well n 16-bit voltage and current measurement The mainframe consists of a controller and four as numerous protection modes and a power-on system providing high resolution of 0.1 mV open slots that can be populated with any system self-test to ensure the reliability of your and 0.01 mA combination of modules up to 2400 W (up to testing. n Automatic test function 4800 W with mainframe extension). The high-performance electronic load modules of For remote communication, the MDL4U Series n 101 memory locations to save/recall setting the MDL4U Series are capable of operating in provides LAN, USB (USBTMC-compliant), parameters constant current (CC), constant voltage (CV), RS232, and GPIB standard interfaces that n Remote sense constant resistance (CR), constant power (CW), support SCPI command protocol. n OVP/OCP/OPP/OTP and reverse voltage and constant impedance (CZ) mode, which uses protection n Rack-mount brackets with handles included Populate the mainframe or mainframe extension with any combination of four modules. Model MDL4U200 MDL4U252 MDL4U302 MDL4U305 MDL4U400 MDL4U505 MDL4U600 Power 200 W *250 W / 50 W *300 W / 300 W 300 W 400 W 500 W 600 W 4U Operating Voltage 80 V 80 V 80 V 500 V 80 V 500 V 80 V Rated Current 40 A 20 A 45 A 20 A 60 A 30 A 120 A No. of Channels 1 2 2 1 1 1 1 * The MDL4U252 and MDL4U302 are dual-channel load modules. The MDL4U252 can allocate up to 250 W to either channel up to 300 W total. (e.g. 250 W/50 W, 150 W/150 W). Similarly, the MDL4U302 can allocate 300 W to either channel up to 600 W total (e.g. 300 W/300 W) Technical data subject to change bkprecision.com B&K Precision Corp. 2021Modular Programmable DC Electronic Load MDL4U Series The tools you need High performance architecture Modular design Transient operation Equipped with a high-performance microprocessor With the removable module design, you can choose Transient operation enables the module to in every mainframe and module, the MDL4U Series suitable load modules to modify the system periodically switch between two load levels. programmable DC electronic load utilizes a according to your requirements. This design A power supplys regulation and transient parallel architecture that provides high allows for multiple channels and is ideal for characteristic can be evaluated by monitoring measurement speed. Additionally, a simultaneous testing several units, especially power supplies the supplys output voltage under varying load on/off operation can be performed through with multiple outputs. At the same time, all load combinations of load levels, duty cycle, and slew the front panel, analog control terminal, or remote modules can be configured to work independently. rate. The MDL4U Series can simulate these SCPI command. This configuration allows the All load modules, including the high power 500 W conditions up to 25 kHz. system to control modules synchronously and and 600 W modules can fit in one slot. Unlike A increases productivity in testing. competitor models that require two slots for high power modules, the MDL4U Series offers a one-slot High Level form factor for all modules. Powerful communication interfaces The MDL4U Series mainframe offers all the latest Low Level Adjustable slew rate options to the user for remote communication. In constant current mode, users can control the Connect via GPIB, Ethernet, USB, or RS232 to rate or slope of the change in current in a T carry out data communication through SCPI and Slew Rate transient response test. Set the slew rate to as USBTMC standard communication protocols to slow as 0.0001 A/s or as fast as 2.5 A/s control all your electronic load modules from a depending on the module and selected current PC. List mode range. Not limited to just switching between two levels, list mode lets you generate more complex Low Voltage Operation sequences of input changes with several different The MDL4U Series can operate at low voltages for applications such as fuel cell and solar cell testing. levels. Up to 7 groups of list files can be saved in the mainframe. Each list can contain up to 84 steps with a minimum width time of 20 s per step. A T Automatic test mode The MDL4U Series can execute multiple test sequences across all channels. Sequences can be cascaded, and each step can be programmed with upper and lower limit values. When applied in automatic production testing, you can easily judge whether the test parameters of your devices are within the specification limits and adjust your process according to the GO/NG Typical minimum operating voltage at full scale current: verdict. MDL4U200 MDL4U252 MDL4U302 MDL4U305 MDL4U400 MDL4U505 MDL4U600 1 V 1 V 1.4 V 4.5 V 1.5 V 5.4 V 1.8 V 2 bkprecision.com