by Martin Rowe @ edn.com:
The DMM (digital multimeter) is a basic measurement tool for nearly every electrical engineer and many other engineers. With the push to constantly improve power efficiency in electronic designs comes a need to not only measure voltage and current, but to dynamically see them as well. Keithey’s DMM7510 combines a 7½-digit DMM with an 18-bit, 1 Msample/s digitizer, which lets you see measurements both numerically and graphically.
Having the ability to see waveforms lets you uncover problems that used to require an oscilloscope. The DMM7510 also features a 5-in. capacitive touch screen. You can use gestures such as swipes and pinches to sweep though setup menus or zoom in or out of waveforms. I tried it firsthand just prior to today’s product launch, as the short video below shows.
DMM provides numerical and graphical displays - [Link]
Clamp multimeter UT204 measures reliably even in real conditions of nowadays mains supplies and for an affordable price moreover.
UT204 from company UNI-Trend is a near relative to the UT203. multimeter. Already UT203 provides a lot of user comfort and a very pleasant feature – measuring of a DC current without interrupting a measured circuit. However UT204 is different from its “weaker” brother in one essential thing – it enable measuring of a true RMS value of alternating signals (TRMS).
As we know, usual multimeters usually deploy a simple rectifier and an RC cell and they´re calibrated to show an effective value of AC voltage – supposing an ideally sinusoidal shape of a measured variable.
In many cases, a non-TRMS multimeter is fully sufficient, but still more frequently we meet devices, which by their power consumption significantly deform originally sinusoidal shape of a mains line voltage. A vast majority of new devices is equipped with switch-mode power supplies deforming a sinusoid, as they draw current for charging of input capacitors mainly on a top of a sinusoid. This situation is partially better at power supplies with a power factor correction (PFC), but even in these cases it´s never an ideal load. At any difference from an ideal sinusoid the accuracy of a common meter significantly drops down and the error can exceed tens of percents. Similar situation is also at various DC/AC inverters (for example 12VDC/230VAC), whose output is usually only an approximated sinus.
That´s why if exact measurement matters to us, it´s more certain to measure by a device equipped by a TRMS measurement. There are many types with this function on the market, and in a segment of clamp multimeters it´s for example the above mentioned UT204, which moreover offers a lot of other functionality for an excellent price.
Detailed information and comparison of UT203/ UT204 will provide you the UT204 datasheet and the UT204 datasheet and UT203-204 user guide. We keep Uni Trend UT204 as a standard – immediately available item.
UT204 is able to measure DC current and also True RMS - [Link]
2x UT33 – with a manual and also automatic range selection are ideal “reserve” tool for every workplace.
Majority of us already probably has its own favorite multimeter. However, sometimes it happens, that we need to measure two parameters at once (for example voltage and current) and with one device it´s usually not possible… Even though it´s obvious, that it would be ideal to have two multimeters, you didn´t buy it, because you simply don´t want or can´t invest a considerable amount into another tool (maybe even a “top level” one.
That´s why we have for you a tip how to solve this dilemma. It is the multimeter Uni-Trend UT33 and right in two versions:
Both tools feature an excellent price/ performance ratio. For the price of approx. 8-11 Euro they offer measurement of all common parameters, incl. AC (voltage, UT33A also current). UT33A also measures hFE of transistors, UT33C a temperature by a K probe. In many cases a higher resolution of UT33A (3999) can be very beneficial. Decent accuracy, solid construction and exchangeable measuring leads (not hard-wired to a device, as usually in this price-level) belong to another pluses of this series. Naturally, multimeters UT33 are also suitable as a “main” tool for beginning amateurs and students.
Universal multimeters UT33A and UT33C for a special price - [Link]
Energy is transmitted in different ways and one of these ways is electricity. It can appear in many forms and through various phenomena such as lightening or electromagnetic induction, and can be used in transport, electrical appliances, and in the residential and industrial sector, to name but a few examples. Physical magnitudes are derived from electricity such as the electric field, current, and electric potential. The latter two are measured in amps and volts respectively.
In order to measure the previous magnitudes and many others, ingenious devices have been developed, called multimeters, which are the perfect example of the high integrity and versatility of the most modern measuring instruments. They are powerful devices, small in size, but large in their ability to detect and solve electrical failures, measure a large variety of parameters such as current, voltage, capacity, resistance, and they are also equipped with additional functions which allow them to measure temperature, continuity, frequency, carry out diode tests or perform as an oscilloscope. Many multimeters have a USB port and have wireless transfer capacity (Bluetooth), which means that the measurement results can be sent to a PC or computer for later analysis. In addition, many of them are designed in such a way that their screen is removable, so that they can operate in difficult to access areas. Read the rest of this entry »
Dave teardown 3 classic analog multimeters:
EEVblog #634 – Analog Multimeter Teardowns - [Link]
When a tool becomes a legend, usually there must be a good reason for it. This is also the case of Voltcraft mark.
Voltcraft has become legendary as a mark almost “from day to day” when in th year 1982 introduced on the market the first digital multimeter Voltcraft 6010 affordable for wide range of customers (for 139 DM), when other common tools were sold for about 300 DM. Already in the first year over 100 000 pcs were sold. Naturally, only the price wouldn´t cause such attention, but it was remarkable, that this tool offered (at a given price) practically the same functionality as other significantly more expensive tools.
This philosophy of an excellent price/ performance ratio together with technical innovations maintains mark Voltcraft up to day and nowadays multimeters represent somewhat like a golden middle way between usual quality meters and top level professional types, as for the quality and also as for the price. Voltcraft often brings innovations, which can´t be found at other equipment or we only find them after some time …
Despite a very affordable price, we can find at Voltcraft tools some features of top-level equipment, for example:
● optically insulated interface for communication with PC, possibility to combine data from several meters in one window
● robust fuse with a disconnecting ability of 1000V/30kA
● lock against insertion of measuring leads into a device if a rear cover is not closed (at a battery exchange)
● low pass filter (LPF below 1kHz) for interference suppression at measuring of AC voltages
● possibility to measure at a decreased impedance (400 kOhm) to suppress interference
● possibility to measure by a clamp accessory (display shows A, mA)
● they´re available with a calibration certificate (at an extra price)
● majority of types has a max. reading of 5999 or up to 39999
● usually they´re CATIV/600V, CAT III/1000V class
● also available types with a resolution of 0,01 Ohm
● measuring of capacity with 10 pF or even 1 pF resolution
● usage of OLED display (VC890)
In our offer can be found a few types attached below this article. A comprehensive comparison of basic features illustrates attached picture and detailed information ca be found in datasheets at particular types.
Multimeters Voltcraft – above-standard quality for an appropriate price - [Link]
Voltset connects to smart devices and turns them into smart multimeters, allowing you to tinker, learn and collaborate with electronics.
Voltset is a module that plugs into a smartphone via a USB connection. It will then turn a smartphone into a smart multimeter. The multimeter is a must have tool for every DIY, tinkerer or hardware hacker. This project was started two years ago by two makers, Michael and Tom. They could not find a multimeter that was convenient to carry, yet powerful and versatile enough to be useful in their wide range of projects. So they set out to build their own. Almost two years later, they are ready to introduce Voltset to the world of makers.
Voltset – World’s Smartest Multimeter for Smart Devices - [Link]
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]