Tag: User Interface

Excellent Build Quality Inside The UNI-T UDP3305S | Voltlog #479

If you’re an electronics enthusiast or professional, you understand the importance of having a reliable and high-quality power supply on your workbench. The UNI-T UDP3305S has been making waves in the industry, and after using it for a month, I can confidently say it’s my favorite bench power supply.

However, a thorough review wouldn’t be complete without a deep dive into its inner workings. In this blog post, I’ll share my findings from tearing down this impressive device. The teardown process revealed a level of build quality that exceeded my expectations. From the matte green FR4 PCB, which is a hallmark of high-end production lines, to the tidy wiring and locking connectors, every aspect screamed attention to detail.

The toroidal transformer, mounted on a solid bracket with rubber insulation, is a testament to the engineering prowess behind this power supply. One of the standout features is the modular design. The back IO panel, main body, and front panel are separate modules, making servicing and maintenance a breeze.

The power stage module, which houses the independent channels, is a marvel of engineering. It features current shunts, bridge rectifiers, MOSFETs for regulation, and relays for input voltage transformer tap selection. The front panel is where the real magic happens. It houses the brains of the operation – an STM32H750 microcontroller, a powerful Cortex-M7 with a floating-point unit and advanced peripherals.

Complementing this is a trio of high-precision DAC (DAC8562) and ADC (ADS1118) chips, ensuring accurate voltage and current regulation across all channels. Throughout the teardown, I was impressed by the attention to detail and the use of high-quality components. From the Fujicon and Macon capacitors to the Hongfa relays, every component has been carefully selected to deliver exceptional performance.

In conclusion, the UNI-T UDP3305S is not just a powerhouse on the outside; it’s a masterpiece of engineering on the inside as well. The build quality, modular design, and top-notch components make it a worthy investment for anyone seeking a reliable and precise bench power supply.

Is the UNI-T UDP3305S the BEST Programmable Power Supply? Find Out! | Voltlog #478

Are you tired of juggling multiple power supplies on your workbench? The UNI-T UDP3305S could be the solution you’ve been waiting for. This programmable DC power supply unit combines four independent channels into one sleek and powerful package, making your life easier and more productive. With three independently programmable outputs (two at 0-30V 5A and one at 0-6V 3A) and a fixed 5V 2A USB output, the UDP3305S offers a total combined power output of 348W.

Its 1mV/1mA resolution and low ripple voltage of less than 350uV (measured at 1MHz bandwidth) make it suitable for powering even the most sensitive analog circuits. One of the standout features of this unit is its ability to internally switch channels 1 and 2 to series or parallel mode, eliminating the need for external wiring and separate adjustments.

Need more than 30V? Switch to series mode for up to 60V at 5A. Need more current? Parallel mode delivers 30V at 10A. The 4.3-inch TFT display provides a clear and intuitive graphical user interface, allowing you to monitor and adjust settings with ease. The unit also offers advanced features like waveform viewing, programmable sequences, monitoring, triggering, and data logging.

With a robust build quality, rubber corner protection, and a carry handle, the UDP3305S is designed for the demanding workbench environment. Connectivity options include USB, Ethernet, RS232, and digital I/O, enabling remote control and integration into automated test setups. While the included Windows software could be more polished, the instrument itself excels in usability and performance.

Compared to alternatives from Rigol, Siglent, and others, the UNI-T UDP3305S offers more features at a lower cost, making it an attractive choice for professionals and hobbyists alike.

EastTester ET5410A+ Electronic Load Review | Voltlog #453

In this comprehensive review, we take an in-depth look at the EastTester ET5410A+ Electronic Load, a 400W max, 150V, and 40A fully programmable dummy load. With its 3.2-inch TFT display, this unit promises an improved user interface over the 7-segment display found in the Kunkin KP184. However, as the review unfolds, it becomes clear that while the ET5410A+ has some notable strengths, it also has areas that could benefit from improvement.

One of the key aspects evaluated in the review is the accuracy and precision of the unit. The manufacturer claims a resolution of 1mV and 1mA, but the reviewer found that this was not always the case, with the display sometimes showing only 10mV and 10mA resolution. After some investigation, it was discovered that a setting in the menu allowed switching between a low range (20V, 3A) and a high range (150V, 40A), which affected both the maximum input and the display resolution.

The functionality of the ET5410A+ is impressive, with features like battery testing, LED testing, and transient testing modes. However, the review highlights some potential software bugs, particularly with the battery discharge feature in Constant Resistance mode, which some users reported issues with on older firmware versions.

Build quality is a mixed bag, with both good and bad aspects. The reviewer praises the overall PCB assembly but raises concerns about the mains earth wiring, placement of wires and connectors, and the lack of full plated footprint holes for the MOSFETs. Safety concerns are also raised, with the earth connection passing through the PCB and soldering issues observed during the teardown.