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4 Nov 2012

A modular system of laboratory devices Hameg 8000 series is an ideal system for testing workplaces and school laboratories. At the same time it enables a very effective usage of space.

To have all we need on a table and to maintain enough space for a work – it is a stable challenge at a work with electronics. We may say, that for example a generator won´t be on my table today. But as it uses to be, after a while we´ll find we need just that instrument, which is missing on a table. Sometimes a solution is to stock them at each other, but we usually face the problem with a different size of instruments, or eventually also an instability of such a “set”. All this is solved by a Hameg 8000 series modular system.

The system consists of a HM8001-2, main unit, serving as a power supply and at the same time it is a holder – frame for any 2 instruments from the 8000 series (instruments don´t have their own power supply – for their operation they need to be inserted into the HM8001-2 basic module). Up to 5 such mainframes can be stocked at each other, what means up to 10 instruments. That brings a big saving of space and especially a comprendious and safe work. At the same time, it enables a big variability – for example usually a one mainframe + 2 instruments (according to an actual need of a given lesson) are usually sufficient for students in school.

Available modules:

  • HM80124¾-Digit Programmable Multimeter (max value 49999) with 0.05% basic accuracy, max. resolution: 10μV, 0.01dBm, 10nA, 10mΩ, 0.1°C, offset function and a relative value measurement, including an RS232 interface and software
  • HM801825kHz LCR-Meter, measures L, C, R, Θ, Q/D, |Z|, 0.2% basic accuracy, 5 measuring frequencies (100Hz, 120Hz, 1kHz, 10kHz, 25kHz), max resolution: 0.001Ω, 0.001pF, 0.01μH, 2- and 4-wire measurement, parallel and serial mode
  • HM8021-41.6 GHz Universal Counter, measurement range 0Hz…1.6GHz, 10MHz time base with 1ppm stability, 2 inputs – 1MΩ/ 50Ω
  • HM8030-610 MHz Function Generator, frequency range 50mHz…10MHz, output voltage up to 10Vpp (do 50Ω), waveforms: sine wave, triangle, square wave, pulse, DC, distortion <0.5% up to 1MHz, rise and fall time 15ns typically, internal and external sweep, FM (with option HO801), surge- and short-circuit-proof (ideal for testing and educational conditions)
  • HM8040-3Tripple Power Supply Unit 2x 0–20V/0.5A – 1x 5V/1A, 3-digit switchable displays (resolution 0.1V/1mA) , Pushbutton for activating/deactivating all outputs, adjustable current limiting and electronic fuse, low residual ripple and low noise
  • HM800Blank Module intended for customized instrument construction, inner guide for PCB mounting in 4 various levels, plastic front panel for easy mechanical processing, power is supplied by the HM8001-2 mainframe

As can be seen from this description, those are the quality instruments with very decent specification and with an excellent price/ performance ratio. Excellent properties are mainly proven in praxis, in a form of several 100 000 units sold all over the world. Detailed information will provide you datasheets at particular modules, series 8000 overview and the overview of options. In case of interest in any Hameg or Rohde&Schwarz instrument, please contact us at info@soselectronic.com

With the Hameg 8000 series devices you always have on a table all you need - [Link]

19 Jun 2012

jaanus.tech-thing.org writes:

I watched EEVblog’s video about debugging a short circuit with precise multimeter. He determined the direction of shorted place by comparing resistances in different places. I wanted to debug like that too and also measure resistances of wires and connectors, but all cheap multimeters measure only down to 0.1Ω. To get 10mΩ I have to buy 400€ multimeter. So I searched and found an article describing cheap and dirty way to measure low resistances. You need a known voltage source and known resistors and then you can form a voltage divider and measure the resistance. Awesome! But the form factor and all the math behind it sucks, as a plug and play device it would be perfect. I though about making it its own box, but was almost impossible to find cheap probe connectors for panel or PCB. So it will be a one PCB product.

First, the concept.

  • It should measure resistances from 1Ω to 0.1mΩ
  • General purpose – can be plugged in any multimeter.
  • Output should be in mV, because most multimeters have mV display.
  • No math, so 1mΩ is translated to 1mV and user doesn’t have to calculate anything.
  • Precise enough – 1% is nice number, but it’s not very important, as usually we need the resolution, not the absolute precision.

Half Ohm – milliohm multimeter adapter - [Link]

1 Jun 2012

If you are someone who enjoys doing your own home improvement and you are working with electronics during the process, having access to a multimeter is an absolute must. There are going to be instances where you will need to be able to measure voltage, ohms and continuity and without an electronic multimeter, it will be difficult to determine just what you need to do. Here are a few tips for using your multimeter to perform home improvement projects.

  1. Understand your options – Multimeters are available in different types. These can run from the most basic to the most luxuries, which is also the most expensive. Unless you have highly advanced electronic skills and knowledge, a basic multimeter is going to be just fine and will have fewer features that you need to figure out.
  2. Familiarize yourself with your multimeter – Take some time to examine the multimeter before you use it. When looking at the face of the design you should see three different things – dial, settings and lead ports. These should be color coded which makes it much easier to avoid mistakes when plugging in leads.
  3. Learn the dial settings – As you look at the dial, take notice of the symbols and numbers that surround it. You should see an arrow that points to the right with a plus sign beside it. This is the setting that is used for continuity. The “V” setting is used for voltage and the setting for ohms or resistance will look like a “0” with feet.
  4. Learn the uses of your multimeter – You can test a random electrical outlet to make sure that the multimeter is working properly. Use the “V” setting for this. Check to ensure that power is not flowing through any electronic circuits that you are testing. If you would like to test for a blown fuse, remove the fuse from the clamps and set the meter for continuity testing. Simply touch each end of the fuse with the meter’s probe and if the fuse is operating properly you should hear a beep.
  5. Test for amperage – When testing for amperage you have to be a bit more careful. This is a more complicated process and requires that you use more than just two probes. You can use a clamp add-on for amperage testing by plugging it into two ports that read “A” and “Com.” Clamp the tester onto the hot wire that you want to test or you can simply purchase a plug that includes a wire loop specifically designed to test amperage.

This article was written by Electric Point, one of the largest independent wholesale groups in the UK and Ireland. Visit us today at electricpoint.com

4 May 2012

embedded-lab.com writes:

A digital multimeter is a very useful instrument that combines several measurement functions in one unit. A typical multimeter includes features of a variable-range ohmmeter, voltmeter, and ammeter. Some of them also include capabilities of testing diodes and transistors. In this article, I am going to talk about a technique of adding thermometer feature to a regular digital multimeter. The technique is very simple and uses one temperature sensor along with two resistors and a DPDT slide switch.

Add a thermometer to your digital multimeter - [Link]

25 Feb 2012

If you often work with batteries and SMT transistors, then the new UT132B multimeter is the right choice for you.

Into our offer we incorporated the new UT132B multimeter – a “brother” of the UT132D, type, which we have introduced to you recently. UT132B provides practically the same functions, including possibility to measure hfe of SMT transistors , NPN and PNP types in a SOT-23 package, by means of a special adapter. The difference between these two instruments is, that UT132B features measuring of 1.5V and 9V batteries status. That´s why it is ideal for everyone, who needs to simply and quickly judge status of batteries. Measuring of 1.5V batteries is proceeded at a 15 Ohms load and measuring of 9V batteries at a 1 kOhm load. The instrument has a HOLD function and a main switch, thus it is not necessary to turn a measuring ranges switch to switch off the device. Similarly like UT132D, also UT132B is very reliably and comfortably held in a hand thanks to compact dimensions and an ergonomic shape.

The new UNI-T multimeter even for testing of batteries - [Link]

16 Feb 2012

Sergei Bezrukov writes:

Some multimeters use 9V block batteries which do not last long and are relatively expensive compared with other alkaline battery types. If the multimeter is used extensively one need to replace batteries pretty often. A more practical solution would be to power the multimeter from AA or AAA batteries and use a DC-DC converter to obtain 9V from 3V.

The converter is based on the power supply controller TL499A manufactured by Texas Instruments and the schematics follows the standard one from the data-sheet. The only difference is attaching a LF filter to pin 3 consisting from a 10 Ohm resistor and a 1μF capacitor. This idea is taken from a similar project published in June 2007 issue of Everyday Practical Electronics and it significantly reduces the voltage peaks at the output. The inductor is Murata 18R473C.

9V DC-DC converter for a multimeter - [Link]

3-to-9V booster - [Link]

21 Jan 2012

David L. Jones writes:

A current adapter for multimeters?

“But don’t most multimeters already have current measurement ranges?” I hear you ask. Well, yes, they do of course. But most multimeters, be they a no-name $10 hardware store throwaway model, or a $1000 highly accurate brand name meter, all suffer from two rather annoying issues with their current measurement ranges – burden voltage and reduced accuracy.

Burden Voltage

The biggest problem with current measurement ranges is called “burden voltage”. This is the voltage that the internal current shunt resistor drops as you pass your circuit current through it. The burden voltage is typically specified in millivolts per Amps (mV/A). The value will change for different current ranges, so you might have 1mV/A, 1mV/mA, or 1mV/μA for example.

Normally you may not give burden voltage a second thought, as like many, you probably think it’s fairly insignificant in most applications. In fact, most people would be hard pressed to tell you what the burden voltage of their particular multimeter actually is. It’s usually buried away in the user manual, if it’s mentioned at all. Next time you borrow a colleague’s meter, ask them what the burden voltage is, and watch their reaction…

µCurrent – A Professional Precision Current Adapter for Multieters - [Link]

5 Nov 2011

With the MS2102 clamp multimeter you can comfortably measure not only alternate but also a direct current and voltage and all this at an outstanding price.

If you´re considering a purchase of a clamp multimeter, or if you already have a common multimeter and want a clamp version, then we have the device with an outstanding ratio of price to performance for you.

Sometimes it isn´t a problem to disconnect a measured circuit and to measure current by a common multimeter connected in series. However you may have already experienced a situation when it wasn´t possible to disconnect the measured circuit, from mechanical or electrical reasons. For these situations a clamp multimeter is an ideal choice. As it is well known, the biggest advantage of clamp multimeters is that they are able to measure a current flowing by a wire lead on the base of an induced magnetic field – without direct connection to a measured circuit. Thanks to the fact that a current is measured indirectly – the multimeter is at measuring galvanically isolated from a measured circuit, what provides a significantly higher safety to the user. From the principle of construction is the clamp multimeter suitable for measuring of mid to higher currents (above approx. 10 mA)

A big advantage of MS2102 is that it enables to measure also a direct current (DC). So for example to measure a current flowing to or from a car battery is with this device a breeze. Concurrently with measuring AC and DC current offers MS2102 also a possibility to measure also an AC and DC voltage, resistance to 400 Ohm and a continuity test. It contains an analogue bargraph and a maximal display value is 3999.

Measure even a direct current with the clamp multimeter MS2102 - [Link]

20 Sep 2011

youritronics.com writes:

I bought this multimeter (Minipa ET-870C) a while ago for $17, great value. I got it because its nice to have around multiple meters for when you wanna measure both input and output voltage/current. I believe it was advertised to have an auto-off feature for 15 mins but it didn’t. This eventually lead to many drained batteries because I often forgot to turn it off after using it. So during a boring weekend when the weather outside was bad I decided to add this nice feature to the meter. I knew it had to be a small circuit to be able to fit inside the multimeter so I picked the tiny25 the smallest micro I had around.

Adding auto turn-off to a cheap multimeter - [Link]

22 Aug 2011

Kerry D. Wong writes:

Most of the multimeters do not offer resistance measurement in the milliohm range. In most meters a typically Ohm range has an accuracy of 0.1 ohm and is too coarse for measuring small resistance. Of course, some of the high-end multimeters have milliohm range and there are also dedicated micro ohmmeters for even more accurate small resistance measurements, but most of them are priced way out of the range for personal use.

Accurate Milliohm Measurement - [Link]





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