Raj @ embedded-lab.com writes:
Here is an instructable that describes a DIY shield which would convert your Arduino board into a multifunctional digital multimeter. This shield can be used with “Arduino” UNO und Duemilanove boards, and can display the measurements on a 16X2 character LCD and/or on the serial monitor window on PC. This digital multimeter Arduino shield has the following features:voltmeter ranges : 0-10V; 0-30V; 0-100V ampmeter range : 0-500mA ohmmeter ranges : 0-1KOhm, 0-250KOhm diode, LED, continuity tester LED functionality tester transistor Beta meter.
Turn your Arduino board into a digital multimeter with this shield - [Link]
This Instructable will teach you how to use the Arduino Analog ports. johnag @ instructables.com writes:
Digital Voltmeters (DVMs) are a special case of Analog to Digital converters- A/DCs.- they measure voltage – and are usually a function of a general purpose instrument called a Digital Multimeter( DMMs), commonly used to measure voltages in labs and in the field. DMMs display the measured voltage using LCDs or LEDs to display the result in a floating point format. They are an instrument of choice for voltage measurements in all kinds of situations. This instructable will show you how to use the Arduino as a DC DVM (Direct Current Digital Volt Meter).
Make a Mini Arduino programmable 4 channel DC-DVM - [Link]
Spring offer of company Wago brings you a price gainful set of favorite terminal blocks together with a novelty – quality clamp multimeter.
Installation terminals Wago 2273 series are becoming a standard in installations and they gradually replace their predecessors – series 273. They´re well known, but if you by a happen don´t know them yet, you can get a brief description for example in a video below this article.So why do we mention them? Because company Wago comes as usually in spring, with a special offer, when you can buy a set of Wago terminal blocks Wago together with some useful tool, multimeter and similar. This time it´s a really attractive offer, because in a set containing 950 pcs of installation terminal blocks you will gain a novelty from Wago – a professional clamp true RMS multimeter type 206-816 (CAT III). Besides a majority of common function it´s also able to measure capacity, frequency, wide measuring range (600V, 600A, 60 MOhm) and also for example a very useful complement at measuring in dark environment – an integrated LED torch.
For the price of 149 Eur you can gain a set of 950 pcs terminal b locks and a universal professional measuring tool. Set of 950 pcs terminal blocks consists of 100 pcs 224-112, 100 pcs 2273-202, 300 pcs 2273-203, 100 pcs 2273-204, 300 pcs 2273-205 and 50 pcs 2273-208.
Fresh offer of Wago terminal blocks with a clamp TRMS multimeter - [Link]
This is a review of the Sanwa PC7000 Multimeter. Video has two parts, Part1 and Part2.
Review: Sanwa PC7000 Multimeter - [Link]
Dave comments on the Sparkfun/Fluke multimeter customs trademark/trade dress fiasco, and shows off the new low cost Fluke 114/117 Kit Multimeter about to be released.
EEVblog #597 – Fluke 114 Kit Multimeter + Sparkfun/Fluke Rant - [Link]
A multimeter is an essential piece of kit for anyone who works with electronics. Combining the functions of a voltmeter, ammeter and ohmmeter — hence the prefix ‘multi’ — these tools are the fastest, safest and most effective way of diagnosing a problem in an electrical circuit.
And while it’s important that who anyone doesn’t own one of those tools does their utmost to get their hands on one, it’s worth taking into consideration a few issues before you commit to a purchase.
This post tells you everything you need to know about buying a multimeter of your own, to ensure that the latest addition to your equipment is to up the job at hand.
Analogue or digital?
Like all equipment, multimeters have seen their fair share of improvements over time and the introduction of digital displays is one way multimeters have become more reliable and easier to use.
What effect does your multimeter input impedance have on the circuit you are measuring? Dave shows a practical example of how it can really screw things up if you aren’t watching out for it.
EEVblog #584 – What Effect Does Your Multimeter Input Impedance Have? - [Link]
Mooshimeter: The Wireless Graphing Multimeter with Data Logging and Multichannel Simultaneous Sampling
The Mooshimeter makes multi-channel measurements possible in situations that are too fast, too slow, too sensitive, or too dangerous to use a traditional multimeter. And by harnessing your smartphone’s hardware, it does so at an insanely low price.
The Mooshimeter was born out of our frustrations as electrical engineers at the limitations of the “standard” digital multimeter.
Almost every digital multimeter will only let you use one mode at a time, meaning that to watch relationships in an active system you need to use multiple meters. Most have a front panel dominated by a numeric LCD display and a gigantic mode selection knob. And having the display mounted on the measurement hardware makes it very difficult to measure moving or enclosed systems, because the user must have clear line of sight to the meter to be able to read it.
Mooshimeter – Measure 600V and 10A with 24 bit precision through 50 meters - [Link]
Universal multimeter UT139C with a high resolution will be appreciated at development and everywhere, where you need to find out a situation in a given device accurately
Imagine a situation, when you need to check or set a voltage of 3.3V or 5V usual at digital electronics (AD converters reference,…). Or to measure the end of recharging of Li-ion/ Li-Pol batteries at 4.20V when it really matters on every miliVolt. In these cases, with usual multimeters you´ll face one cardinal fact – regarding that the most of them has a max. display reading of 1999, you´ll measure in hardly the first quarter of a range, thus with a significantly lower resolution. For example instead of desired 4.001 V (3 decimal positions), you´ll only see 4.00V. Naturally, we don´t always need such a high resolution but many times an improvement of resolution in one magnitude can provide us a worth information about a real situation in a measured circuit. In these situations it often doesn´t matter on the absolute accuracy that much, but right on a resolution, especially when comparing voltages in two points, increase/ decrease…
From this point of view is the novelty in our stock UT139C an excellent device providing besides a high resolution (5999) also another features worth to notice, for example: TRUE RMS measurement in a range of 45Hz-1kHz (to 400 Hz with VFC filter activated), measuring of high-capacity capacitors up to 99.9 mF (99 999 uF), measuring of duty cycle in a range of 0.1% – 99.9% and other. Not quite common is also measuring of uA and mA even in AC range. Function Rel is useful even at measuring of small capacitors, where it´s able to eliminate “offset” caused by a capacitance of testing leads.
A thermometer (K type) with arrange of -40 to 1000°C can also be useful at development. From some point of view it´s advantageous supplying by two AA cells, not by a classic 9V battery (AA cells have a better capacity/ price ratio).
UT139C is also able to serve as a non-contact AC voltage tester (NCV), indicating in 4 steps a proximity of >100VAC voltage. . Indication is by a red LED in the upper part of display, by a display (-,–,—,—-) and by a buzzer.
Further information will provide you the UT139C datasheet.
With the UT139C you´ll find out why 5999 is better than 1999 - [Link]
Inrush current, effective power, power factor, harmonic distortion, … all these and other parameters handles CM8 with easiness.
Clamp multimeters are often used mainly thanks to their ability to measure AC (and even DC) current even without a disconnection of a wire. But it´s only one basic feature, which more sophisticated devices can use even for another purposes, like comfortable measuring of power and power factor. Benning CM8 is a device able to provide detailed information regarding power conditions in a measured circuit and measure much more than usual clamp meters, for example:
● measuring of inrush current
● measuring of effective power in 4 ranges – 4/40/400/600 kW + calculation of a power factor in a full range -1,00…0…+1,00
● VAC true RMS in a frequency range of 45-500Hz, high accuracy up to a crest factor of 3
● harmonic distortion with 0,1% resolution and sensitivity up to 25-th harmonic (ACV, ACA)
● measuring of DC current up to 600A (0.1A resolution)
It can be said, that Benning CM8 is a device, with which it´s possible to check even large circuits and for example find possible source of defects and similar. Thanks to a measurement of inrush current it´s able to give a real information about a load of a circuit and thus for example to give an information, whether it´s possible to add another device into a given circuit etc.
Detailed information about the CM8 will give you the Benning CM8 user guide and an overview of Benning measuring and testing devices.
Top class multimeter Benning CM8 examines even motors - [Link]