Data Sheet Modular Programmable DC Electronic Load MDL Series Features and Benefits mode, which uses DSP technology to simulate non-linear loads and realistic loading behavior. The MDL Series is a multi-channel modular programmable electronic load system. Seven different modules of programmable DC loads ranging in power from 200 W to 600 W provide users the flexibility to test a wide range of power sources from multi-output AC/DC power supplies to batteries, fuel cells, and photovoltaic arrays. Easily edit the load’s parameters such as voltage, current, slew rate, and width via the front panel. Increase productivity by saving your test parameters into any one of the 101 memory areas for quick system recall. Additionally, the MDL Series provides 16-bit resolution as well as numerous protection modes and a power-on system self-test to ensure the reliability of your testing. The mainframe has four slots that can be configured with any assortment of the modules up to 2400 W (up to 4800 W with mainframe extension). The high-performance electronic load modules of the MDL Series are capable of operating in constant current (CC), constant voltage (CV), constant resistance (CR), constant power (CW), and constant impedance (CZ) Modules For remote communication, the MDL series provides LAN, USBTMC compliant USB, RS232, and GPIB standard interfaces that support SCPI command protocol. Power range up to 2400 W ■ Voltage range up to 500 V ■ Current range up to 120 A ■ CC/CV/CR/CW/CZ operating modes ■ Removable modules for easy system configurability ■ 200 W *250 W/ 50 W 300 W/ 300 W 300 W 400 W 500 W 600 W 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 1 2 2 1 1 1 ■ Operate identical modules in parallel mode for high current applications ■ Synchronous Load on/off function ■ Standard LAN, GPIB, USB, and RS-232 interfaces with USBTMC/SCPI protocol support ■ Analog current control and monitoring ■ Transient mode up to 25 kHz ■ List mode (sequence mode) - minimum 20 µs ■ Adjustable slew rate in CC mode ■ 16-bit voltage and current measurement step width with 84 user programmable steps system providing high resolution of 0.1 mV and 0.01 mA ■ Automatic test function ■ 101 memory locations to save/recall setting parameters * The MDL252 is a dual-channel 250 W load module supporting a unique flexible power configuration. The user can allocate up to 250 W to either channel up to 300 W total (e.g. 50 W/250 W, 250 W/50 W, 150 W/150 W), thus replacing many dual-channel modules with fixed power distribution. Technical data subject to change © B&K Precision Corp. 2016 1 Support for up to 16 channels using dual channel modules with mainframe extension MDL200 MDL252 MDL302 MDL305 MDL400 MDL505 MDL600 Power No. of Channels ■ ■ Remote sense ■ OVP/OCP/OPP/OTP and reverse voltage protection www.bkprecision.com Modular Programmable DC Electronic Load MDL Series ▲ Front panel Bright VFD display Module pane l keys Adj ust me nt kno b Main frame functi on keys Nume ric ke ypad Po wer swi tch M ai nframe M odules ▲ Rear panel GPIB i nte rface Load input t ermi nals RS- 232 in terface L AN in terface Module curre nt moni torin g t ermin al M ain frame t rig ger I/O and synchroni zati on on /of f cont ro l USB i nte rf ace 2 M ai nframe exten sion con necto r Module re mo te s ense , digit al I/O, and analog current co ntrol terminal www.bkprecision.com Modular Programmable DC Electronic Load MDL Series The tools you need High per formance architecture Mod ular d esig n Tr ansient operation Equipped with a high-performance microprocessor in every mainframe and module, the MDL Series programmable DC electronic load utilizes a parallel architecture that provides a high measurement speed. Additionally, a simultaneous load on/off operation can be performed through the front panel, analog control terminal, or remote SCPI command. This configuration allows the system to control modules synchronously and increases productivity in testing. With removable module design, you can choose suitable load modules to modify the system according to your requirements. This design allows for multiple channels and is ideal for testing several units, especially power supplies with multiple outputs. At the same time, all load modules can be configured to work independently. All load modules, including the high power 500 W and 600 W modules can fit in one slot. Unlike competitor models that require two slots for high power modules, the MDL Series offers a one-slot form factor for all modules. Transient operation enables the module to periodically switch between two load levels. A power supply’s regulation and transient characteristic can be evaluated by monitoring the supply’s output voltage under varying combinations of load levels, duty cycle, and slew rate. The MDL Series can simulate these conditions up to 25 kHz. A High Level Low Level Powe rful communication interfaces The MDL Series mainframe offers all the latest options to the user for remote communication. Connect via GPIB, Ethernet, USB, or RS232 to carry out data communication through SCPI and USBTMC standard communication protocols to control all your electronic load modules from a PC. Adjustable slew r ate In constant current mode, users can control the rate or slope of the change in current in a transient response test. Set the slew rate to as slow as 0.0001 A/µs or as fast as 2.5 A/µs depending on the module and selected current range. Low Voltag e Operation The MDL series can operate at low voltages for applications such as fuel cell and solar cell testing. T Slew Rate List mode Not limited to just switching between two levels, list mode lets you generate more complex sequences of input changes with several different 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 µs per step. A T Automatic test mode The MDL 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 verdict. Typical minimum operating voltage at full scale current: 3 MDL200 MDL252 MDL302 MDL305 MDL400 MDL505 MDL600 1V 1V 1.4 V 4.5 V 1.5 V 5.4 V 1.8 V www.bkprecision.com Modular Programmable DC Electronic Load MDL Series Specifications Model MDL200 MDL252 MDL302 MDL305 MDL400 MDL505 MDL600 0-80 V 0-80 V 0-80 V 0-500 V 0-80 V 0-500 V 0-80 V Low 0-4 A 0-3 A 0-4.5 A 0-3 A 0-6 A 0-3 A 0-12 A High 0-40 A 0-20 A 0-45 A 0-20 A 0-60 A 0-30 A 0-120 A 300 W / 300 W 300 W 400 W 500 W 600 W Input ratings Input Voltage Input Current Input Power 200 W Channels Minimum Operating Voltage 250 W / 50 W 1 1 2 2 1 1 1 1 Low 0.10 V at 4 A 0.15 V at 3 A 0.14 V at 4.5 A 0.7 V at 3 A 0.15 V at 6 A 0.54 V at 3 A 0.18 V at 12 A High 1 V at 40 A 1 V at 20 A 1.4 V at 45 A 4.5 V at 20 A 1.5 V at 60 A 5.4 V at 30 A 1.8 V at 120 A 0-80 V 0-500 V 0-80 V CV mode Range Resolution Accuracy Low 0-18 V High 0-80 V 0-80 V 0-80 V 0-500 V Low 1 mV High 10 mV Low ± (0.05 % + 0.02 % F.S.) ± (0.05 % + 0.025 % F.S.) High ± (0.05 % + 0.02 % F.S.) ± (0.05 % + 0.025 % F.S.) CC mode Range Resolution Accuracy Low 0-4 A 0-3 A 0-4.5 A 0-3 A 0-6 A 0-3 A 0-12 A High 0-40 A 0-20 A 0-45 A 0-20 A 0-60 A 0-30 A 0-120 A Low 0.1 mA 1 mA 0.1 mA High 1 mA 10 mA 1 mA Low ± (0.05 % + 0.05 % F.S.) ± (0.05 % + 0.1 % F.S.) High ± (0.05 % + 0.05 % F.S.) ± (0.1 % + 0.1 % F.S.) CR mode Range Low 0.05 Ω-10 Ω 0.05 Ω-10 Ω 0.05 Ω-10 Ω 0.25 Ω-10 Ω 10 Ω-7.5 kΩ High Resolution Accuracy 0.05 Ω-10 Ω 0.2 Ω-10 Ω 0.2 Ω-10 Ω 400 W 500 W 600 W 16-bit Low 0.01 % + 0.08 S High 0.01 % + 0.0008 S CW mode Range 200 W 250 W 300 W 300 W Resolution 10 mW Accuracy ± (0.2 % + 0.2 % F.S.) Transient mode (CC mode) T1&T2 2 20 us-3600 s / Res: 5 µs-10 ms Accuracy Slew Rate 3 5 µs+100 ppm Low 0.0001-0.25 A/µs 0.0001-0.2 A/µs 0.0001-0.25 A/µs High 0.001-2.5 A/µs 0.001-2 A/µs 0.001-2.5 A/µs 0.0001-0.1 A/µs 0.0001-0.25 A/µs 0.0001-0.1 A/µs 0.001-1 A/µs 0.001-2.5 A/µs 0.001-1 A/µs 0.0001-0.25 A /µs 0.001-2.5 A/µs 1 ) MDL252: The user can allocate up to 250 W to either channel up to 300 W total (e.g. 50 W/250 W, 250 W/50 W, 150 W/150 W). 2 ) Fast pulse trains with large transitions may not be achievable. 3 ) The slew rate specifications are not warranted, but are descriptions of typical performance. The actual transition time is defined as the time for the input to change from 10% to 90%, or vice versa, of the programmed current values. In case of very large load changes, e.g. from no load to full load, the actual transition time will be larger than the expected time. The load will automatically adjust the slew rate to fit within the range (high or low) that is closest to the programmed value. 4 www.bkprecision.com Modular Programmable DC Electronic Load MDL Series Specifications Model MDL200 MDL252 MDL302 MDL305 MDL400 MDL505 MDL600 Readback voltage Range Resolution Low 0-18 V High 0-80 V 0-80 V 0-80 V 0-500 V 0-80 V 0-500 V 0-80 V Low 0.1 mV 0.1 mV 0.1 mV 1 mV 0.1 mV 1 mV 0.1 mV High 1 mV 1 mV 1 mV 10 mV 1 mV 10 mV 1 mV Accuracy ± (0.025 % + 0.025 % F.S.) Readback current Range Resolution Accuracy Low 0-4 A 0-3 A 0-4.5 A 0-3 A 0-6 A 0-3 A 0-12 A High 0-40 A 0-20 A 0-45 A 0-20 A 0-60 A 0-30 A 0-120 A Low 0.01 mA 0.01 mA 0.01 mA 0.01 mA 0.1 mA 0.01 mA 0.1 mA High 0.1 mA 0.1 mA 0.1 mA 0.1 mA 1 mA 0.1 mA 1 mA Low ± (0.05 % + 0.05 % F.S.) ± (0.05 % + 0.1 % F.S.) High ± (0.05 % + 0.05 % F.S.) ± (0.1 % + 0.1 % F.S.) Readback power Range 200 W 250 W 300 W 300 W Resolution 10 mW Accuracy ± (0.2 % + 0.2 % F.S.) 400 W 500 W 600 W Protection range (typical) OPP OCP 200 W 250 W Low 4.4 A High 44 A 82 V OVP 310 W 300 W 400 W 500 W 600 W 3.3 A 5A 3.3 A 6.6 A 3.3 A 13.2 A 22 A 50 A 22 A 66 A 33 A 132 A 82 V 82 V 510 V 82 V 510 V 82 V OTP 185 ºF (85 ºC) General (typical) Short Circuit Current (CC) Low 4A 3A 5A 3A 6A 3A 12 A High 40 A 30 A 50 A 20 A 60 A 30 A 120 A Voltage (CV) Resistance (CR) Input Terminal Impedance Safety Electromagnetic Compatibility Dimensions Weight 0V 25 mΩ 50 mΩ 30 mΩ 220 mΩ 25 mΩ 180 mΩ 15 mΩ 300 kΩ 300 kΩ 300 kΩ 1 MΩ 300 kΩ 1 MΩ 300 kΩ EN61010-1:2001, EU Low Voltage Directive 2006/95/EC Meets EMC Directive 2004/108/EC, EN 61000-3-2:2006, EN 61000-3-3:1995+A1:2001+A2:2005 EN 61000-4-2/-3/-4/-5/-6/-11, EN 61326-1:2006 3.2” x 7.2” x 22.6” (82 x 183 x 573 mm) 11 lbs (5 kg) Three-Year Warranty 5 www.bkprecision.com Modular Programmable DC Electronic Load MDL Series Mainframe Specification Number of Slots Power Input Operating Temperature Storage Temperature Humidity 4 110/220 V ±10%, 50/60 Hz 32 to 104 ºF (0 to 40 °C) 14 to 140 ºF (-10 to 60 °C) Indoor use, ≤95% Note: Applies to MDL001 mainframe and MDL002 mainframe extension. Mechanical Specifications Model Type Dimensions (W x H x D) Weight MDL001 Mainframe 17.5” x 7.2” x 21.6” (445 x 183 x 549 mm) 34 lbs (15.4 kg) MDL002 Mainframe Extension 17.5” x 7.2” x 21.6” (445 x 183 x 549 mm) 34 lbs (15.4 kg) MDL200 Module 3.2” x 7.2” x 22.6” (82 x 183 x 573 mm) 11 lbs (5 kg) MDL252 Module 3.2” x 7.2” x 22.6” (82 x 183 x 573 mm) 11 lbs (5 kg) MDL302 Module 3.2” x 7.2” x 22.6” (82 x 183 x 573 mm) 11 lbs (5 kg) MDL305 Module 3.2” x 7.2” x 22.6” (82 x 183 x 573 mm) 11 lbs (5 kg) MDL400 Module 3.2” x 7.2” x 22.6” (82 x 183 x 573 mm) 11 lbs (5 kg) MDL505 Module 3.2” x 7.2” x 22.6” (82 x 183 x 573 mm) 11 lbs (5 kg) MDL600 Module 3.2” x 7.2” x 22.6” (82 x 183 x 573 mm) 11 lbs (5 kg) Standard Accessories Mainframes Power cord, user manual, mainframe extension cable (MDL002 only) Modules Certificate of calibration and test report Optional Accessories Rack mount kit RK153 for mainframes MDL001 and MDL002. 6 v041816 www.bkprecision.com