# B&K Precision MDL4U252 80V/20A/300W Dual-Channel DC Electronic Load Module # B&K Precision MDL4U252 80V/20A/300W Dual-Channel DC Electronic Load Module ## Key Features At A Glance - Modular mainframe accepts any combination of four DC load modules with module power ratings from 200 W to 600 W - Scalable to 16 channels using dual-channel modules with the MDL4U002 mainframe extension - Operating voltage range up to 500 V and current range up to 120 A across the module lineup - CC, CV, CR, and CW operating modes with 16-bit voltage and current measurement resolution (0.1 mV / 0.01 mA) - Standard LAN, GPIB, USB, and RS232 interfaces with USBTMC/SCPI protocol support for ATE integration - Transient mode operation up to 25 kHz and list mode with 20 µs minimum step width across 84 user-programmable steps - Adjustable CC-mode slew rate from 0.0001 A/µs to 2.5 A/µs (module dependent) for transient response testing - OVP, OCP, OPP, OTP, and reverse voltage protection with synchronous load on/off across modules The BK Precision MDL4U Series is a multi-channel modular programmable DC electronic load system designed for testing a wide range of power sources. The platform consists of the MDL4U001 mainframe with a built-in controller and four open slots, populated with any combination of seven available load modules ranging from 200 W to 600 W. A single mainframe accepts up to 2400 W of load capacity, and the MDL4U002 mainframe extension expands the system to 4800 W and up to 16 channels when dual-channel modules are used. The MDL4U Series is built for testing multi-output DC power supplies, batteries, fuel cells, and photovoltaic arrays. All modules operate in constant current, constant voltage, constant resistance, and constant power modes, supporting both steady-state characterization and dynamic loading. Transient mode operation enables periodic switching between two load levels to evaluate power supply regulation and transient response, while list mode supports more complex multi-level input sequences for waveform-driven test scenarios. ValueTronics is a B&K Precision authorized distributor and supports MDL4U Series customers from our 20,000 sq ft facility at 1675 Cambridge Drive in Elgin, Illinois. Each {{CONDITION}} MDL4U mainframe, extension, and load module is inventoried, prepared, and shipped from Elgin, with technical resources available to help configure module combinations against the specific voltage, current, and channel-count requirements of an application. ## Brand Heritage B&K Precision was founded in 1951 and has operated under that brand name continuously, providing test and measurement instruments for more than 70 years. The company's European operations are conducted through its French subsidiary Sefram, and Asian operations through B+K Precision Taiwan. ## Compare Other Models in This Series The MDL4U Series is organized around a common mainframe and extension architecture populated by seven interchangeable load module types. The MDL4U001 mainframe contains the system controller, four module slots, and the front-panel keypad, VFD displays, and adjustment knobs that drive each installed module. The MDL4U002 mainframe extension provides power and connectivity for an additional four module slots, doubling the system's module capacity when connected to an MDL4U001. Module selection determines the voltage range, current range, power rating, and channel count of each slot. Single-channel modules range from 200 W to 600 W and cover input voltages of either 80 V or 500 V, while two dual-channel modules (MDL4U252 and MDL4U302) distribute their total module power between two independent channels. All modules share the same 3.2 × 6.7 × 22.6 inch single-slot form factor, including the 500 W and 600 W high-power modules. Each new MDL4U Series mainframe, extension, and load module is its own dedicated product page with condition-matched pricing. Configurations using multiple modules can be assembled across mixed condition grades — for example, a new MDL4U001 mainframe with a combination of new modules — based on inventory and the customer's requirements. Within the family, the high-voltage modules (MDL4U305 at 500 V/20 A/300 W and MDL4U505 at 500 V/30 A/500 W) address applications operating above 80 V, while the 80 V single-channel modules cover progressively higher current and power: MDL4U200 (40 A/200 W), MDL4U400 (60 A/400 W), and MDL4U600 (120 A/600 W). The dual-channel MDL4U252 and MDL4U302 are positioned for testing devices that require two independently controlled load channels in a single slot, with allocatable power between channels. The comparison table below shows the headline electrical ratings that differentiate the seven module types: input voltage range, input current range (both low and high ranges), input power rating, and channel count. These are the specifications that determine which module fits a given device-under-test profile, since the operating mode set (CC/CV/CR/CW), the 16-bit measurement resolution, the protection feature set, and the SCPI/USBTMC interface support are common across the family. Two additional specifications worth noting when comparing modules are minimum operating voltage at full-scale current — which varies from 1 V on the MDL4U200 and MDL4U252 up to 5.4 V on the MDL4U505 — and the CR-mode low range, which is 0.05 Ω to 10 Ω on most modules but 0.25 Ω to 10 Ω on the MDL4U305 and 0.2 Ω to 10 Ω on the MDL4U400, MDL4U505, and MDL4U600. These differences affect low-voltage source testing (such as fuel cell and solar cell applications) and low-resistance load simulation, respectively. Model Power Operating Voltage Rated Current **MDL4U252** 250 W / 50 W (300 W total allocatable) 80 V 20 A MDL4U001 — — — MDL4U002 — — — MDL4U200 200 W 80 V 40 A Additional differences in specifications beyond the few shown above are not listed here — see each model's full specifications below. ## Accessories Supplied - Certificate of calibration ## Product Core & Specifications Specification MDL4U252 Input Voltage 0 to 80 V Input Current (Low) 0 to 3 A Input Current (High) 0 to 20 A Input Power 250 W / 50 W (user-allocatable up to 300 W total; e.g. 50 W/250 W, 250 W/50 W, 150 W/150 W) Channels 2 Min Operating Voltage (Low) 0.15 V at 3 A Min Operating Voltage (High) 1 V at 20 A CV Range (Low / High) 0 to 18 V / 0 to 80 V CV Resolution (Low / High) 1 mV / 10 mV CV Accuracy (Low / High) ± (0.05% + 0.02% F.S.) / ± (0.05% + 0.025% F.S.) CC Range (Low / High) 0 to 3 A / 0 to 20 A CC Resolution (Low / High) 0.1 mA / 1 mA CC Accuracy ± (0.05% + 0.05% F.S.) CR Range (Low / High) 0.05 Ω to 10 Ω / 10 Ω to 7.5 kΩ CR Resolution 16-bit CR Accuracy (Low / High) 0.01% + 0.08 S / 0.01% + 0.0008 S CW Range 250 W CW Resolution 10 mW CW Accuracy ± (0.2% + 0.2% F.S.) Transient T1 & T2 20 µs to 3600 s / Res: 5 µs to 10 ms Transient Accuracy 5 µs + 100 ppm Slew Rate (Low / High) 0.0001 to 0.2 A/µs / 0.001 to 2 A/µs Readback Voltage Range (Low / High) 0 to 18 V / 0 to 80 V Readback Voltage Resolution (Low / High) 0.1 mV / 1 mV Readback Voltage Accuracy ± (0.025% + 0.025% F.S.) Readback Current Range (Low / High) 0 to 3 A / 0 to 20 A Readback Current Resolution (Low / High) 0.01 mA / 0.1 mA Readback Current Accuracy ± (0.05% + 0.05% F.S.) Readback Power Range 250 W Readback Power Resolution 10 mW Readback Power Accuracy ± (0.2% + 0.2% F.S.) OPP 250 W OCP (Low / High) 3.3 A / 22 A OVP 82 V OTP 185 °F (85 °C) Short Circuit Current CC (Low / High) 3 A / 30 A Short Circuit Voltage (CV) 0 V Short Circuit Resistance (CR) 50 mΩ Input Terminal Impedance 300 kΩ Dimensions (W x H x D) 3.2" x 6.7" x 22.6" (82 x 170.5 x 573 mm) Weight 11 lbs (5 kg) Warranty 3 Years **Important:** Per the datasheet: slew rate specifications describe typical performance and are not warranted. Actual transition time is defined as the time for the input to change from 10% to 90% (or 90% to 10%) of the programmed current value, and very large load changes — such as no-load to full-load — may exceed the expected time as the load adjusts the slew rate to the closest available range.**Important:** The MDL4U001 mainframe is required to house and control up to 4 DC load modules. Add the MDL4U002 mainframe extension for up to 8 modules total. Modules are sold separately and must be ordered to populate the mainframe.**Important:** Fast pulse trains with large transitions may not be achievable.**Important:** 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) closest to the programmed value.**Important:** MDL4U252: The user can allocate 250 W to either channel up to 300 W total (e.g., 50 W/250 W, 250 W/50 W, 150 W/150 W).**Important:** MDL4U302: The user can allocate 300 W to either channel up to 600 W total (e.g., 300 W/300 W).Recommended pairing: begin with the MDL4U001 mainframe to house and control up to four load modules, and add the MDL4U002 mainframe extension when an application requires up to eight modules (or up to 16 channels using dual-channel modules) on a single controlled system. **Please review the Manufacturer's Data Sheet to verify published specifications. Feedback on this webpage is always welcome — please reach out to your Test Architect at any time for questions or concerns. Thank you, we truly appreciate you being our customer.** ## Details - **Price:** 2710.0 USD - **Vendor:** B&K Precision - **Type:** Dc Electronic Load - **Tags:** BK Precision, DC Electronic Load, Manufacturers, Power Supplies & Loads, product_manual_group_3, Product_new ## Variants | Variant | Price | Available | |---------|-------|-----------| | Default Title | 2710.00 USD | In stock | ## Images - MDL4U252 BK Precision DC Electronic Load - MDL4U252 BK Precision DC Electronic Load --- > Source: [ValueTronics](https://valuetronics.com/products/mdl4u252-b-k-precision-dc-electronic-load-new) > Updated: 2026-05-30