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20 Apr 2015

obr1530_1

Precise heatsinks from the production of Fischer Elektronik will take care for your devices to stay “cool”.

Over 40 years of experience of company Fischer reflect in an excellent reputation and mainly in a stable high quality of their products. Main production portfolio consists of heatsinks, connectors and enclosures. Narrow specialization on mechanical and electromechanical components is reflected just in details. We can be sure, that a heatsink which we´ll use in our device, will be available the same precisely made even in a year, two,…

Fischer Elektronik takes care for one of the most important feature of heatsinks – planarity and surface smoothness in a place of a supposed touch of component with a heatsink. This a critical place, as even the best heat-conducting pastes have still a noticeable worse thermal conductivity than aluminium and just a high planarity and smoothness enables to use only a thin paste layer.

Also available are versions with an anodized surface (natural, black and other colors) as well as various “exotic” shapes. Upon request company Fischer also makes a custom products, drilling, milling,…
And what in the case that we need to cool kilowatts? – in that case it might be a suitable solution to use a liquid cooling, which can be also find in the Fischer Elektronik catalogue.

Leave an excess heat to Fischer heatsinks – [Link]

17 Apr 2015

obr1688_uvod

Higher RF power, GMSK modulation and extra low power consumption make a new communication module interesting even for rough conditions.

At cars, chip-tuning usually results in a higher power of a motor. Even the new communication module (transceiver) TR72D from IQRF has passed such „chip-tuning“ of RF portion, resulting in a higher max. RF output (up to 12mW). New RF chip – Spirit1, used at TR72D also provides excellent sensitivity and GMSK modulation (Gaussian Minimum Shift Keying) with high resistance to interference. That´s why the new module is able to transfer data at much higher distance than previous types (up to 600m on a free space). This improvement has one limitation – the new module is usable with applications originally developed for previous types, but it´s not usable in one RF network simultaneously with older types (because of a different modulation).Basically the new module TR72D offers the same straightforward development of devices with a wireless communication as previous modules. The best idea about differences among particular types will give you the attached table. TR72D is a hot novelty from which we have first engineering samples. Version „DAx“ also contains built-in antenna.

Features of IQRF technology, description of the development environment and other features can be found in a record of our webinar Wireless MESH networks without programming.

Detailed information will provide you the Wago 2059-2060-2061 brochure.

IQRF module TR72D communicates at up to 600m distance – [Link]

14 Apr 2015

TekFunction

by elektor.com:

Tektronix Inc., has introduced a new entry-level Arbitrary/Function Generator. The AFG1022 is targeted at educational institutions and supports a wide range of use cases and course subjects. The AFG1022 also integrates with the new TekSmartLab wireless lab instrument management solution.

Michael Ewald, General Manager, Bench Products, Tektronix stated that “Tektronix strongly believes that a rich hands-on experience dramatically improves education outcomes, that’s why we are working hard to meet the needs of colleges and universities including good price-performance on instrumentation, integrated courseware and ease of administration.”
Key performance specifications include dual-channel, 25 MHz bandwidth with 1 mVpp to 10 Vpp output, 14-bit vertical resolution and 1 µHz frequency resolution. It provides a 125 MS/s sample rate along with 64 MB of built-in non-volatile memory and USB memory expansion for user-defined waveforms.

On the functionality side, the instrument offers 50 built-in standard functions and arbitrary waveforms with continuous, modulation, sweep and burst modes to cover almost all the test requirements found in basic education labs. A built-in 200 MHz counter with 6-digit resolution offers an easy and precise way of performing frequency, period, pulse width, and duty cycle measurements.

Tektronix Entry-level Function Generator – [Link]

8 Apr 2015

obr1489_1

With thermal fuses you´ll make a big step towards a higher safety of your device.

It´s surely not necessary to remind that any device can fail. Failure of a component, overload of a component (underestimated sizing), external influence and many other reasons are daily causing failures of devices. If the result of a malfunction is only an intermediate shutdown, it´s let´s say a better case. But if a device malfunction could cause further damage or even fire, it´s surely worth to make everything possible to prevent it.

A typical component used as a complementary – independent protection from overheating is a thermal fuse. It is a cheap but very useful component, which opens (disconnects) a circuit after exceeding certain temperature. It is a “one shot” component, i.e. after its activation it remains open and the fused circuit is disconnected (the fuse must be exchanged). It´s suitable to choose such fusing temperature of the fuse, as we consider to be really faulty, which otherwise can´t occur in an ordinary operation. Production processes enable to produce thermal fuses in a wide range of temperatures and so fuses Microtemp from company Thermodisc, which we keep in stock, are available in a range of 72-257°C (opening temperature). It´s a really wide range enabling to use a fuse for example for fusing of other component (for example a thermal fuse thermally joined with a transistor heatsink) but also for guarding an air temperature inside a device. These fuses operate on a principle of melting a small plastic pellet inside a fuse, what will cause release of a spring and a consequent disconnection of contacts.

A substantial advantage of thermal fuses Thermodisc is a maximum current up to 10-25A/250VAC depending on a type. On stock we keep the G4 series with a max. current of 10A/250VAC. Small dimensions enable to use a component similarly like any ordinary component. It´s only necessary to be careful at assembling (overheating) especially at low-temperature types.
Details regarding a correct assembly as well as an overview and tips for a correct use of thermal fuses can be find in the Thermodisc application guide. Teplotné poistky sú dostupné aj v iných púzdrach, prípadne aj s nožovými kontaktmi (Fast-on). Thermal fuses are also available in other packages, or also with tabs (Fast-in). Finally, we can mention, that to reach the highest protection level in critical application, it´s ideal to incorporate several types with a slightly different fusing temperature in series.


They act only ones – right then, when it´s really necessary – [Link]


7 Apr 2015

obr1681_uvod

Industrial Ethernet enables interconnection among standard office network and industrial environment thus becoming a standard for industrial production.

In presence, Ethernet is most widely spread communication technology in the world. It enables a fast data exchange between all devices connected in the local network.
Thanks to its simplicity, Ethernet standards became the most frequently used network standards. A reason of this popularity is, that they offer a simple technology connected with the biggest network – internet. Advantages of Ethernet and all related concepts are obvious:

  • simple possibility of expansion
  • fast initialization thanks to its connection technology
  • dynamic adjustment of bandwidth (up to 10 Gbit/s)
  • identical network topology for various applications (office and industrial)

Classic system of buses 
Industry and production segment is characteristic by using of buses like: AS-Interface, Profibus, Device-NET and CANopen. They allow to connect a line of sensors, actuators, measuring probes and motors, which can be controlled by a controlling unit. Communication runs down to a level of sensors / actuators. Transfer speeds are up to 12 Mbit / with max. 255 devices depending on a given bus system. Linear displacement with al devices connected in series is dominant.

New possibilities thanks to industrial Ethernet
Industrial Ethernet representsattractive alternative of a classic bus syste. Industrial Ethernet Advantages represented by (producer-independent) are still more used in everyday praxis. Industrial Ethernet brings advantages of “usual” Ethernet into often harsh environment (reliable connectivity, availability and easy expansion). Cables of company Lapp Kabel belong to a top in this segment. We bring you a basic overview of the most frequently used components.


Do you also use industrial Ethernet? – [Link]

30 Mar 2015

SAMSUNG

Highly variable tables and furniture Variolab+ are suitable for education and also for production/ service. Thanks to a wide range of various modules it´s possible to arrange a configuration that perfectly suits your needs.

It´s possible to work in various conditions. Excessively said – even on a classic office table. However, for a really effective work it´s certainly better to use a table, where everything is there, where you want, it has a correct height, offers a lot of space for the work itself, it´s safe and it also might be ESD safe…

Variolab+ laboratory tables produced by a Czech company Diametral meet the highest criteria of ergonomics and safety. A few-thousand (Euro) investment for a common configuration of such table is probably too much for a beginning designer, but for fully engaged production-, service- and testing workplaces as well as school classrooms this equipment quickly “refunds”. For example thanks to these reasons:

  • maximal workspace while maintaining all devices easy to reach (power supplies, circuit breakers, measuring equipment, isolating transformer,…)
  • minimum time to start a work, high efficiency of work/ education
  • possibility of a central remote control (for example by a teacher) or also to adjust max. voltage limit and similar
  • high safety, certified solution
  • enables to compose a table exactly according to your needs with maximal usage of available space
  • stable construction from robust steel components treated by a powder baked coating (long-term stable construction, stronger than similar one from aluminium)
  • modular design enables to choose from a large amount of electric and electro-mechanical modules, which can be installed in a rear part of a work-desk as well as above the work-desk
  • open system enabling anytime to add other modules, superstructure,..
  • up to 150 kg work-desk load capacity thanks to a robust frame beneath the desk
  • superstructure with devices (modules) can be placed on a work-desk or above the work-desk (to reach a max. space)
  • possibility to equip also with pneumatic elements (air distribution,…)

Wide range has a standard height of 200mm and width in multiplies of 60mm. Basic work-desk can be equipped with boxes, cabinets, shelves, drawers, tiltable oscilloscope holder, tools holder,…. Among modules, which can be integrated in a table also belong a soldering station, oscilloscope, RLC decades, as well as various AC and DC power supplies, regulation transformers, circuit breakers,… Moreover, tables can be stacked into various sets and we´re also able to supply you with laboratory cabinets, chairs,….

For illustration we also bring you some photos of typical worktables, which we supplied to our customers. Guide price of such a table is approximately 4000 to 4500 Eur. Resulting price is naturally strongly dependent on types and amount of modules used in a given table.

Variolab+ laboratory  furniture can help also to you – [Link]

27 Mar 2015

obr1543_1

To tell the truth, probably no, but we have for you a few hints for relays which are very close to an ideal.

Signal relay is almost an „ideal component“ thanks to a practically zero distortion and a total isolation of a switched signal from a control one. That is naturally one of the main features of all electromechanical relays, but at signal relays it´s especially valued, as we usually require switching of relatively small signals. Favorite and widely used are for example relays Fujitsu series B3 and B4 (miniature SMT and THT relays) and series AxW (miniature only 5mm high relay) – all with bifurcated gold-plated contacts for a high reliability.

A novelty in our portfolio is the series Fujitsu NA representing something like a “golden middle way “. With dimensions 7,4×14,9×9,7 mm it belongs to narrow miniature relay enabling a high density of components on a PCB. Even though relay NA is somewhat bigger than for example series B4, but it´s able to withstand higher AC current – up to 0.5A/125VAC (vs. 0.3A at series B4) and it also provides an extreme mechanical lifetime up to 100×106 , what´s approximately twice that of B4 series. Sensitive coils, with a consumption of 0.1-0.3W at majority of types enable a dense mounting without problems with overheating.

From the point of view of the lowest possible consumption are naturally the best latching relays (with a permanent magnet) controlled only by pulses. Usually they´re easy to recognize by a letter „L“ behind the series marking (for example NAL, JSL). In a Fujitsu signal relays overview and the Fujitsu catalogue can be easily found a comparison among particular types as well as detailed information about them. We try to keep the most favorite types always on stock, what´s also reflected in the substantial increasing of stock.


Does a universal signal relay exist? – [Link]

26 Mar 2015

obr1675_1

Silent operation, immunity against mechanical shocks and magnetic field and other factors make a solid state relay the best choice for many applications.

Where to start? We´ll try to name “pluses” of solid state relays – SSR:

  • long lifetime, no moving parts, no contact burning
  • silent operation, very desirable for commercial and medical applications
  • minimum electrical noise thanks to a possibility of zero-crossing switching
  • easy control (interfacing) and minimum energy consumption to control
  • resistance to shocks and vibrations, installation in any position
  • fast switching (approx. 0.1 ms)
  • low weight
  • immunity to outer magnetic field (usable near powerful motors,…)

Some disadvantage of SSR is, that they generate more heat when conducting a current through “contacts”, than classic EMR. But this is dependent on a switched current. On the other hand – power consumption of the SSR itself is minimal in comparison to EMR of a similar size.

From above mentioned features result, that SSRs are a great choice everywhere, where it´s necessary to switch frequently and/or also to change rotation of motors (integrated in a single component). SSRs are also maximally suitable for switching of DC currents (solar applications, batteries,…) as they don´t suffer by arcing and contact wearing like classic EMRs (DC arcing is much more difficult to extinguish than the AC one). Much longer lifetime in comparison to EMRs result in very low operation/ service costs and significantly eliminates losses caused by eventual downtimes.

If we allured you to SSR, than it´s certainly worth to take a look at products of a leading producer in this field – výrobky spoločnosti CRYDOM, which specializes for development and production of SSRs already for over 40 years. Among novelties in our stock can be found Crydom SSR for PCB in SIP and miniSIP packages, panel mount types, as well as types for a DIN-rail mount. Their basic features are very similar, they differ mainly in max. voltage and current, which they´re able to switch.

Practically each SSR Crydom is available for switching of AC or DC current and also in an “R” version (random switching in any phase of AC voltage) or „ZCD – zero crossing“ switching in “zero” (suitable for minimizing of switching noise).

Detailed specification can be found in the datasheets at jednotlivých typoch and a help at selecting will provide you documents Crydom overview, Crydom product guide, Crydom Selecting SSR and Crydom motion control. The „SSR-the inside story” document is intended for those of you, who like to understand components deeply.


CRYDOM – solid state relays from specialists – [Link]

24 Mar 2015

obr1444_1

When observing basic rules will the top quality AGM VRLA batteries last you up to 15 years – we will advise how.

This description could start by a long list of technical improvements of Panasonic batteries. thanks to which they gained a stable place on the top of development in this segment (AGM, expanded positive grid. additives for regeneration from a deep discharge, self-extinguishing container material,…).

However those are things, which can be easily checked up from available internet source or even better from satisfied users. Instead of it, we better bring you a few advices for usage of VRLA/ SLA batteries to serve you as long as possible:

18 Mar 2015

obr1187_1

LT series LED drivers with 10-100W power represent a complete solution with wide possibilities of control. Exceptionally narrow and slim design, remained even at high-power versions, provides a high flexibility of use. 

Power supplies for LED lighting (so called drivers) are available from many producers, in a various qualitative level. Why to decide just for the LT series from German company Friwo? Here are few reasons:

  • precise design, safe operation and a long lifetime
  • voltage and current regulation in one device
  • high efficiency and a possibility of dimming in a range of 0-100% directly via a CTRL pin
  • modules are available in 10-100W power, with a possibility of customization by laser directly at production
  •  also available a module for dimming – so called DIMMbox, further expanding possibilities of control (switch, 1-10V, DALI) and with a possibility of synchronization with up to 1000 slave units
  • very small cross section of modules (21x30mm, resp. 24x30mm at LT100) – applicable even in very tiny conditions

Wide control possibilities of LT series modules are perhaps the most interesting. Modules contain a galvanically isolated CTRL input, by which it is possible to switch on/ off the module without disconnecting from 230V mains. CTRL pin also serves for regulation of an output current. For this purpose, only one resistor (or a potentiometer) is necessary – connected between SEC+ and CTRL pins, with a value counted by a simple formula in the datasheet. The output current can also be controlled by an external voltage in the range of 0-1,8V connected to SEC- and CTRL, as well as by means of a PWM TTL (0/5V).

Further possibilities of control are provided by a standalone additional module DIMMbox. DIMMbox operates as an (almost) lossless PWM regulator with a MOSFET switched at f=600Hz. DIMM-BOX connected to any series LT driver enables to regulate an output current in a range of 10-100% or 0% (OFF) via a usual switch („switch-dimm“ mode), via a linear voltage 1-10V and also a DALI interface. DIMMbox tests after switching on, which of three methods of control is used and consequently accepts only signals from a given input – until switching off the module. DIMMboxes can be connected through SYNC inputs, ensuring the same level of dimming for all modules. Enclosed pictures will provide you the best idea about possibilities of connection.

Every power class is available in several versions, with various output voltages and currents . Detailed information will provide you the LT series overview, DIMMbox datasheet, as well as datasheets of particular models, for example LT20 or LT100.


Friwo LED drivers will light up your LEDs as much as you just want – [Link]



 
 
 

 

 

 

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