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RoadTests & Reviews

30 Posts authored by: dougw Top Member
What is this blog about? Back in June rscasny was looking for people to experiment with thermocouple connectors. I got selected and connectors were dispatched. However they did not arrive until mid August. Meanwhile I was designing a PCB for the connectors (they are designed to be PCB mounted). I designed the connector footprint according to the datasheet, so they fit, but now that I see how they fit, I would design the foot print slightly differently to make them easier to hand solder. When ...
I was one of the lucky ones who received a Raspberry Pi 4 Model B in the 10th Birthday Celebration. What I wrote back then was: Pi4 - The Window on the World When they designed the Raspberry Pi 4 Model B, they read my mind about what new features I would like to see in a Raspberry Pi. The reason I had this feature list in my mind was I wanted to build a full desktop computer to learn Linux with and then explore setting it up for useful workflows and applications. The location for this computer ...
This project is about building an interesting medical application project around Honeywell pressure sensors and a Cypress PSoC6 BLE Kit. I am partnered with glennvanderveer on this project. He will be doing most of the heavy lifting now that he has recieved a PSoC6 BLE Kit from jomoenginer . Thanks jomoenginer. Our project aims to use a Honeywell pressure sensor to measure shock waves that could damage ears. The project will also experiment with different types of ear protection to see how eff ...
The Interested Phase It all started when element14 posted a new road test for a Keysight E3613A power supply. I thought "that looks interesting", I can always use a good power supply. So I looked up the specs posted in the road test announcement. They looked great, so I set up a directory to collect documentation on the device, including links to the road test page.   The Research Phase I then went to the Keysight web site to find more information. I found the document library page fo ...
This is my first meter that can perform datalogging and I think it is a powerful feature because when it is needed this ability will save a lot of work.  It seems I often need to design new types of sensor Many of these sensors need to be tested for linearity and accuracy This usually involves manually adjusting or sometimes automatically adjusting a quantity to be measured and taking corresponding readings to be analyzed later It is always tedious and time-consuming to stop manipulating th ...
One of the applications I wanted to include in this road test is capacitance water level sensors because you can get an accurate depth measurement for almost no cost as long as you have a meter that can measure capacitance The Keysight  U1282A meter does measure capacitance and is useful for testing and calibrating such sensors The physics behind why this technique works is a little trickier than it looks but I want to provide a bit of a feel for the technique without delving into math Basi ...
This segment of the road test will start exploring some of the applications I want to use this meter for - the real reasons I applied for the road test.   I design and assemble a lot of PCBs with surface mount components. Inevitably I end up with a variable number of random unused parts of unknown value. Capacitors in particular or small footprint resistors have no markings to indicate their value, so these parts become essentially useless. I have collected a small container with quite a nu ...
The Keysight  U1282A Multimeter is an awesome instrument loads of features great resolution(59999 great accuracy(0.025 spectacular battery life(up to 800 hours and phenomenally rugged(3 m drop and IP67 Dave Jones has done a monumentally punishing torture test of this meter. Here he is tossing it out the window of a car driving at 88 km/hr and it still worked fine afterwards. If you want check out just how spectacularly rugged this meter is see his torture test video here. Maybe Keysight ...
This is the third installment in the Keysight  https://www.element14.com/community/view-product.jspa?fsku=NULL&nsku=58Y5948&COM=noscriptU1282A digital multimeter road test In this segment I am exploring some of the capabilities and procedures that allow this meter to measure voltage waveforms.   Links to other installments of this road test: unboxing component and DC voltage measurements exploration waveform measurements exploration teardown research applications exploration ...
This is the second installment in the Keysight  U1282A digital multimeter road test In this segment I am exploring some of the capabilities and procedures that allow this meter to measure component values and DC voltages   Links to other installments of this road test: unboxing component and DC voltage measurements exploration waveform measurements exploration teardown research applications exploration - component sorting applications exploration - water level measurement applicatio ...
The Keysight  U1282A has just arrived for a road test It has been a long tough week but I wanted to get started on the road test with an unboxing video I intend to add more blogs and video to this review but I will edit this blog to add all the links as they get completed Note the handy storage clips for the probes, that protect the probe tips and control the leads while not in use. Those probe slots provide extra cushioning if the device is dropped. This instrument is quite large for a ...
I have been interested in LEDs since before blue or white LEDs were available and have always followed LED technology progress, so this road test was was going to be interesting even if I did not manage to be selected as a sponsored participant. Fortunately my proposal was selected, allowing me to enjoy experimenting with some interesting LED technology as well as an MSP430 Launchpad. My proposal was fairly ambitious for a road test as it undertook to demonstrate about half a dozen applications ...
Traditional reflow systems use a conveyor that physically moves PCBs through various IR heated zones to achieve the desired time versus temperature profile, but this is not well suited to a (very) small prototype operation like my house. In my last blog I investigated hot air heating of a substrate for reflow soldering of SMT LEDs to metal core PCBs. This time I am investigating the use of induction heating to accomplish the same task. Induction heating is touted as the next great method of cook ...
This update in the LED Road Test explores reflow soldering of Würth Elektronik power LEDs. Reflow systems generally try to use a temperature profile to heat the work up to soldering temperature. Here is a plot of a typical thermal profile: This profile has several purposes such as minimizing thermal stress, evaporating flux and melting the solder without overheating the components. My first test will be using a heat gun to heat up the substrate from below. I start by doing a dry run to get ...
This is my proposal for the LED Road Test+ sponsored by element14, Texas Instruments and Würth Elektronik - in case people are curious about what it took to get selected as a participant:   LEDs have long been an interest of mine, in fact my first patent was on LED optics so this road test is definitely interesting. The LED Road Test has several components that lend themselves to different applications, so in my road test they would be applied in different experiments: The Power LED d ...

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