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mp2100

Mestek Multimeter

Posted by mp2100 Dec 14, 2018
This item arrived on my desk today (thanks Terry).  Mestek model CM81, Digital Clamp Meter.  It's inexpensive, available on Amazon.  It's made in China, Shenzen.   It's Cat III, 600volts.  It has a lot of features.  I have two low end Fluke meters, and I wanted a clamp-on amp meter for when I'm troubleshooting control panels. The user manual is short, but then, the manual that came with my Fluke 115 had less information.  It comes with basic test leads, wi ...
A team at Imperial College London and M Squared have built a new navigation device using a quantum accelerometer. The large device is made with ships and trains in mind. (Photo via Imperial College London)   GPS is essential for navigation and since it’s a standard feature on all smartphones, getting lost is no longer a worry. Unfortunately, it’s not always reliable. All it takes is a failed satellite or a jamming attack to make GPS useless. Now, scientists believe they have fo ...
BrainGate2 is an electrode system implanted in the brain that lets you text, send emails, and browse the internet with your mind. Two people send text messages using BrainGate2. (Photo via BrainGate)   Imagine being able to fire off a text message with your mind. A new electrode system called BrainGate2 does exactly that. A new study found that three people paralyzed from the neck down were able to use unmodified tablets to send text messages, browse the internet, and stream music using th ...
A team at Purdue have built a new eye implant using magnets for a more reliable and safe implant. The implant cleans itself using microactuators when exposed to a magnetic field. (Photo via Purdue)   Glaucoma is a common, yet serious, condition that occurs when the eye’s drainage channels are blocked. This causes humor fluid to collect within the eye faster than it can drain out, increasing intraocular pressure, which can damage the optic nerve and cause blindness. Luckily, it’ ...
Peter, Jon and I are building a Programmable Electronic Load. In this series, I'm using test automation to characterise the device. I'm now including an oscilloscope to add up to 4 additional measurements to the test recordings.   The process tests the load for a range of voltages and currents, and measures some points of interest. The results are logged to a spreadsheet.     In the previous post, I documented the core test cycle. It puts the instrument through a wide se ...
three-phase

Extech MG302 Review

Posted by three-phase Nov 13, 2018
Introduction Continuing on from the disappointment of the Flir IM75 I decided to move away from looking at specific insulation testers and looked more towards an insulation multimeter on a par with the Keysight  U1461A Hence the MG302 from Extech ironically a Flir company   Keysight Insulation Multimeter Failure   Megger MIT420/2 Road Test   Chauvin Arnoux CA6526 Insulation Tester Review   Flir IM75 Insulation Tester Review   I have come across Extech instrume ...
One of my favorite tools is the Flush Cutter. I like them so much that I have seven of them right now. Yes besides the Multimeters and Bench Power Supplies I have also have a flush cutter addiction.     In the course of my daily play in the shop I am constantly working with soldering components and clipping leads. A good flush cutter fits the hand well and has a spring action that opens as one's grip is relaxed. The cutter jaws must close evenly and not allow any sunlight to pass t ...
Introduction  Following on from the Flir and Chauvin Arnoux units, I decided to take a look at what Fluke offered and how it would compare to the Keysight and Megger units that I have also reviewed.   Megger Road Test Review Keysight U1461A Fault Chauvin Arnoux CA6526 Review Flir IM75 Review   There are essentially three meters available from Fluke that are in the format I am interested in. The Fluke 1503 is their basic offering and does not offer any download capability a ...
Connecting the thermocouple sensor to instrumentation must be done carefully to optimize accuracy and minimize cost. The resultant temperature measurement is only as accurate as the sensor and its interface.   The thermocouple produces only a small thermo-electric e.m.f (typically 40μV/oC) and it is necessary to eliminate or minimize spurious thermal emf signals and Ohmic effects which would otherwise result in incorrect readings.   The length of cable used between the sensor ...
Everyone is familiar with the USB Batteries that can be used to charge a cell phone and which can themselves be charged off a any standard USB port or charger. A while back I began using one type of these batteries to power some of my small projects and also I began to advocate their use to my friends for this purpose. Here are two of the many brands and types currently available.     For the rest of this Blog I will refer to them as "Black" and "Silver". My first experience with us ...
Introduction Diodes (or p-n junctions) make extremely low-cost temperature sensors! They are convenient, especially since they can be included on the silicon as part of larger designs into integrated circuits (ICs) - it costs almost nothing to include one : ) There are many dedicated ICs of course too, that use a p-n junction as a temperature sensor, and wrap an analog-to-digital converter (ADC) and a simple interface such as I2C around it. Again they are low-cost, and it is not unusual in larg ...
Hayabusa 2’s landers will study the surface of Ryugu and send photos and samples back to Earth. Hayabusa 2 making contact with the asteroid. (Photo via JAXA)   News like this is why we're here.   Back in 2014, Japan’s space agency, JAXA, launched a robotic spacecraft, dubbed Hayabusa 2, to land on the asteroid Ryugu, a “Type C” thought to have hefty amounts of water and organic materials that could be used to learn more about its solar systems. The spacecraft ...
This miniature satellite may change the way we track weather patterns (Photo from NASA)   It seems no matter how many advances we make in technology, no one can still get the weather right. That may change with NASA’s latest development. The agency has been testing a small, shoebox-sized satellite that can make more accurate weather forecasts. It does this by using experimental technology to detect rain and snow in order to see storms.   Called RainCube, short for “Radar ...
Audi’s 25th Hour Flow Research shows more smart cars on the road will decrease traffic, but it won’t be enough to solve the issue of congested roads. A look at how smart cars can improve traffic flow. (Photo via Audi)   At the end of a long day, you’re ready to go home and binge watch some shows on Netflix, work on your classic car, stare at a wall, do whatever blows your hair back. But before that, you have to deal with rush hour traffic. It’s a nightmare. Congeste ...
Part of Google’s guide to bringing native hearing aid support to Android (Photo via Google)   According to the World Health Organization, roughly 466 million people suffering from hearing loss. That number is expected to grow to 900 million by 2050. With this in mind, many companies are stepping up and providing aids to help those afflicted. For instance, there are Bluetooth hearing aids compatible with iPhones, but this leaves Android users in the dust. Google is hoping to fix this ...

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