Review – VoltLog

Is the Rigol DG822 Pro the Best Function Generator for Your Money? | Voltlog #490

If you’re in the market for a high-quality, feature-packed function generator that won’t break the bank, the Rigol DG822 Pro is definitely worth considering. This dual-channel, 25MHz arbitrary waveform generator packs a punch, offering a wide range of capabilities that make it a versatile tool for hobbyists, students, and professionals alike.

One of the standout features of the DG822 Pro is its comprehensive library of built-in arbitrary waveforms. With dozens of custom waveforms to choose from, you’ll have a wealth of options at your fingertips for generating complex, non-standard signals. Additionally, the instrument allows you to create and run sequences of up to 64 arbitrary waveforms, giving you even more flexibility in your signal generation.

The user interface is a highlight, with a well-designed, intuitive layout that makes it easy to navigate and adjust settings. The 7-inch touchscreen display is clear and responsive, and the dedicated keys for common waveforms and functions streamline the operation. While the circular keypad arrangement may take some getting used to, it’s a minor quibble in an otherwise user-friendly design.

Connectivity is another strong suit of the DG822 Pro. With LXI over LAN and web control capabilities, you can easily access and control the instrument remotely, a huge convenience for collaborative projects or remote testing scenarios. The built-in 32GB of storage and the option to add external storage via USB further enhance its versatility.

Performance-wise, the DG822 Pro delivers solid results for its price point. While it may not match the absolute top-tier instruments in terms of raw specs, it offers more than enough capability for most hobby, educational, and small business applications. The ability to output signals from 1mVpp to 10Vpp, with a frequency resolution of 1uHz and a wide range of modulation techniques, should meet the needs of most users.

Of course, no product is perfect, and the DG822 Pro has a few minor drawbacks. The high-pitched fan noise, while not uncomfortably loud, may be a nuisance for some users. The font rendering on the GUI could also be improved, though this is a cosmetic issue that doesn’t affect functionality. Overall, the Rigol DG822 Pro is an excellent choice for anyone seeking a capable, feature-rich function generator at an affordable price point.

With its impressive array of built-in waveforms, intuitive interface, and robust connectivity options, it offers exceptional value for the money. While it may not be the ultimate performance powerhouse, it strikes a great balance between capability and cost, making it a solid investment for a wide range of applications.

The Ultimate Handheld Thermal Camera Kaiweets KTI-W02 | Voltlog #489

Are you in the market for a budget-friendly thermal camera that doesn’t compromise on quality? Look no further than the Kaiweets KTI-W02. This compact yet powerful device offers impressive features that cater to a wide range of applications, from home inspections to automotive diagnostics and electrical troubleshooting.

Unboxing the Kaiweets KTI-W02 is a delightful experience, with its premium packaging and inclusion of a hard EVA carry case. The camera itself boasts a sleek design, with ridges around the display and camera lens for added protection. Despite its compact size, it packs a punch with a 256×192 pixel thermal sensor, a temperature measurement range of -20°C to +550°C, and a lightning-fast 1-second boot time.

One of the standout features of the Kaiweets KTI-W02 is its impressive battery life of up to 16 hours, coupled with a rapid 2.5-hour recharge time. This makes it an ideal companion for extended field operations or prolonged inspections. Additionally, the camera’s IP54 rating ensures dust and water resistance, while its 2-meter drop rating provides peace of mind against accidental drops.

In terms of performance, the Kaiweets KTI-W02 delivers crisp and detailed thermal images, thanks to its 25Hz frame rate. The camera offers multiple display modes, including thermal-only, visual-only, fusion, and picture-in-picture, allowing you to customize the view according to your needs. While the fusion mode could use some improvement in aligning the thermal and visual images, it still provides a useful perspective.

The camera’s menu system is user-friendly and intuitive, allowing you to adjust settings such as temperature range, emissivity, color palettes, and region of interest measurement. However, it’s worth noting that the camera lacks video recording capabilities and is limited to a single center-point measurement on the screen.

RIGOL DM858 Multimeter Review | Voltlog #485

The Rigol DM858 is a high-quality multimeter from a reputable manufacturer, boasting a 7-inch touchscreen display and a sleek form factor reminiscent of their oscilloscope line. With a wide range of measurement capabilities, including 10A current, 10mF capacitance, and 0.03% accuracy on DC voltage, it certainly packs a punch in terms of specifications.

One of the standout features is the web view and control interface, allowing you to access and control the multimeter remotely from any computer or mobile device connected to your local network. This level of convenience is a welcome addition to any modern lab setup. However, the DM858 is not without its flaws.

During testing, a concerning auto-ranging bug was discovered, where the meter fails to detect the need to switch to a higher voltage range, potentially leading to incorrect readings and even internal damage. Rigol has been notified, and a firmware fix is hopefully on the way. Another disappointment is the lack of a built-in data logging feature, which seems counterintuitive for a multimeter in this price range.

While the user manual mentions data logging capabilities, the implementation appears incomplete and unintuitive. Other minor gripes include the inability to use math functions in auto-range mode, the lack of a thermocouple probe or USB cable in the package, and the recommended software being outdated and incompatible with modern Windows versions.

Despite these drawbacks, the DM858 remains a compelling option for those seeking a multimeter with a large touchscreen display and remote control capabilities. Its unique form factor may appeal to those with limited bench space or a preference for monitor-mounted instruments. Priced at around $500 (or €440 in the EU), the DM858 competes with alternatives like the UNI-T UT8805E, which offers better specifications at a lower cost but lacks the touchscreen and web control features.

Ultimately, the decision to purchase the Rigol DM858 will depend on your specific needs and priorities. If the touchscreen, remote control, and unique form factor outweigh the concerns raised in this review, it could be a worthwhile investment for your workbench.

Affordable 10Gbit Switches Are Here! Mokerlink | Voltlog #484

The world of high-speed networking is no longer limited to enterprise-level gear. With the rise of affordable options like the Mokerlink 2g04210GSMX, upgrading your home or small office network to blazing-fast speeds has become a reality. This compact managed switch packs a punch with its 4x 2.5Gbit ports, 1x SFP+ 10Gbit port, and 1x RJ45 10Gbit port, all encased in a sleek metal enclosure.

But why do you need 10Gbit Ethernet, you might ask? One compelling reason is the need for lightning-fast access to network-attached storage (NAS) devices. With modern computers often equipped with limited built-in storage, a high-speed NAS becomes essential for storing and accessing large files, such as media libraries or creative projects, without frustrating bottlenecks.

The Mokerlink 2g04210GSMX strikes the perfect balance between performance and affordability, offering a robust feature set at a mere $100 price point. Its passively cooled design ensures silent operation, while the solid metal construction and thoughtful thermal management contribute to long-term reliability.

Setting up the switch is a breeze, with a user-friendly web management interface that provides comprehensive control over port configuration, VLAN settings, and other advanced networking options. Whether you’re a home user or a small business owner, this switch adapts to your needs, delivering the flexibility to optimize your network’s performance.

But what truly sets the Mokerlink apart is its attention to detail. From the well-soldered components to the extra thermal pads and heatsinks, the teardown reveals a commitment to quality that often surpasses similar offerings from other brands. And with stocking locations in the US and EU, along with FCC and CE certifications, you can rest assured that your purchase is backed by reliable support and hassle-free returns if needed.

Excellent Build Quality Inside The UNI-T UT8805E | Voltlog #481

In the world of high-end multimeters, the UNI-T UT8805E stands tall with its impressive build quality and top-notch components. In a recent teardown video, we got an up-close look at what makes this professional-grade instrument tick. The teardown process revealed a meticulously designed interior, with high-quality parts sourced from reputable manufacturers like Analog Devices, Texas Instruments, and Maxim.

The mainboard boasts a large, matte green PCB panel with ample space, showcasing UNI-T’s commitment to quality. One of the standout features is the AD7122-2 24-bit, sigma-delta ADC from Analog Devices, capable of sampling up to 31kS/s, although UNI-T has wisely limited it to 5kS/s for improved noise performance.

Complementing the ADC is the MAX6225AESA+ 2.5V voltage reference with an impressive tempco of 1.5ppm per degree C and long-term stability of 20ppm/1000 hours at 25°C. The analog section is a true marvel, with a plethora of high-quality components like AD8622 rail-to-rail op-amps, OP72 op-amps, an AD637 RMS converter chip, ADG1209 multiplexers, and a MAX333A quad analog switch.

Input protection is top-notch, with surge arrestors, metal oxide varistors, and beefy film capacitors. At the heart of the instrument lies a TRION T20F256 FPGA, responsible for sampling data from the ADC and managing the auto-ranging features and measurements. The front panel boasts an STM32F407 Arm Cortex-M4 application processor, handling data from the FPGA/ADC and managing the display and keypad.

While UNI-T acknowledged a couple of issues in the initial review, they’ve assured that a newer revision has addressed these concerns. A fresh unit is on its way for further testing, so stay tuned for updates on this impressive multimeter’s performance.

The UNI-T UT8805E Review: Packed with Features, BUT… | Voltlog #483

In the ever-evolving world of test equipment, the UNI-T UT8805E promises to be a game-changer for professionals and hobbyists alike. Boasting a 5.5-digit resolution and a plethora of modern features, this benchtop multimeter aims to redefine precision and convenience. While vintage meters like the HP/Agilent 3478A offer similar resolution, the UT8805E brings a fresh perspective with its cutting-edge functionality, connectivity options, and warranty support.

Gone are the days of sacrificing modern amenities for precision; the UT8805E seamlessly blends accuracy with a user-friendly interface and robust data logging capabilities. Under the hood, the UT8805E packs a punch with impressive specs, including a 4.3-inch TFT LCD, 5K readings per second, TRUE-RMS measurements, and 1GB of internal flash storage.

Its accuracy is nothing short of remarkable, with a 1-year specification of 0.015% + a few counts for DC voltage measurements. Beyond the standard fare, the UT8805E offers a wealth of advanced features, such as diode testing, frequency measurement, thermocouple temperature sensing, and various math functions.

Connectivity options abound, with USB, RS-232, Ethernet, and optional GPIB support, ensuring seamless integration with modern workflows. However, the UT8805E is not without its flaws. The buggy software, lack of a web interface, and a noisy cooling fan are notable drawbacks that may give some users pause.

Additionally, the update process and the non-functioning buzzer on the review unit raise concerns about user experience and quality control. Nonetheless, the UT8805E’s strengths outweigh its weaknesses, making it a compelling choice for those seeking a modern, feature-rich multimeter without compromising accuracy or functionality.

With its intuitive user interface, bright display, and comprehensive connectivity options, the UT8805E offers a compelling alternative to vintage meters, provided UNI-T addresses the reported issues.

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.

Raspberry Pi 5 on Steroids: The NVMe Upgrade | Voltlog #477

Are you looking to supercharge your Raspberry Pi 5’s performance? Look no further than upgrading to an NVMe SSD drive! In this comprehensive guide, we’ll walk you through the simple steps to configure and boot your Pi 5 from a blazing-fast Samsung MVME Drive. Forget the sluggish performance of traditional SD cards – an NVMe SSD will take your Pi 5 to new heights of speed and reliability.

While there are different tutorials out there, we’ll provide you with the most up-to-date method for March 2024, ensuring a seamless and hassle-free experience. We’ll be using the Raspberry Pi 5, along with the official cooling kit and power supply, the Geekworm P580 metal case, and the Geekworm X1002 PCIe shield.

These accessories, designed to work seamlessly together, will make the entire process a breeze. However, feel free to use alternative hardware, as the instructions provided should apply to most setups. The Raspberry Pi 5 is the first Pi to officially expose a PCIe interface, enabling a significant performance boost.

While not as fully-featured as desktop PCIe interfaces, the single PCIe 2.0 lane is still a game-changer. We’ll guide you through adapting the Pi 5’s flat flex connector to the M.2 form factor using the Geekworm X1002 shield, supporting various SSD sizes. One caveat to note is the current issue with Phison-based SSD controllers.

While progress is being made, for a plug-and-play solution, we recommend using a Samsung SSD or other reported-working drives. We understand the temptation of cheaper Phison-based options, but a little extra investment ensures a smooth sailing experience. Once the hardware is assembled, we’ll walk you through the software configuration, including updating your Pi OS, flashing the image to the NVMe drive, and setting the boot order to prioritize the PCIe drive.

We’ll even cover an experimental step to switch to PCIe Gen3 for an additional speed boost (though results may vary). By the end of this guide, you’ll have a Raspberry Pi 5 running at blistering speeds, perfect for demanding tasks or simply enjoying a snappier overall experience. We’ll share benchmark results, community comparisons, and tips for ensuring your setup runs optimally.

VESA Mount Arm For Rigol DHO800 Series | Voltlog #474

Elevate your workbench ergonomics with a simple yet ingenious solution – mounting your Rigol DHO800 oscilloscope on an articulated monitor arm. In this innovative setup, I’ll guide you through the process of maximizing your workspace while improving your workflow efficiency. The key to this hack lies in the Rigol DHO800’s standard VESA mount, allowing you to seamlessly integrate it with a monitor arm.

Imagine having your oscilloscope swing in and out of your work area effortlessly, freeing up valuable bench space for other tools and projects. No more awkward positioning or constant rearranging – just a clean, organized setup tailored to your needs. Choosing the right monitor arm is crucial. While high-end options with gas struts and multiple articulating points exist, a simple, spring-based arm like the Maclean MC-458 can be a cost-effective solution.

At just $30, it offers a weight range of up to 7kg, perfect for the lightweight Rigol DHO800 (approximately 1.5kg). If your oscilloscope is too light for the arm’s tension, a clever hack is to add artificial weight using wheel weights from a tire shop. Simply attach them to the VESA mount, and voilà – your oscilloscope will balance perfectly with the arm’s force.

Integrating the monitor arm into an aluminum profile workbench is a breeze, thanks to the standard channel spring nuts and M8 bolts. Adjust the height, angle, and rotation to suit your preferences, and enjoy a truly ergonomic viewing experience.