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Jan 20

Introduction To Signal Conditioners

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The function of a signal conditioner is to convert one type of electronic signal into another type of signal. The most common example of signal conditioning is used in analog-to-digital converters (abbreviated ADC, A/D) where a continuous quantity is converted to a discrete digital quantity with its associated sampling rate.

Typical steps in control engineering application:

Sensors collect data.
Signal Conditioner converts this data the appropriate signal type.
Processing of data by a controller (For example Microcontroller or a Programmable Logic Controller.)

It must be noted that controllers come with varied functions. For example a microcontroller is designed for simpler tasks on embedded machinery applications and a Programmable Logic Controller is a digital computer used for more complex automation processes.

When signal conditioner converts an electronic signal there are a number of tasks that may take place depending on the complexity and operating environment of the process control installation. One such task is the “amplification” of the overall scale of the signal. An example of this would be converting a 0-10mV signal to a 0 -10V signal is an example of amplification.
Another process associated with conditioning is the “electrical isolation” of functional sections of electrical systems which basically results in unwanted signals from the input line from passing through the output line. Electrical isolation is sometimes referred to as “loop isolation”.

“Cold Junction Compensation” and “linearization” are common in signal conditioners for thermocouple applications which a non-linear input signal to a linear output signal as well as adjusting for fluctuations in room temperature. As you may have surmised, thermocouple conditioners are used for temperature measurement and control in industrial applications.
Mounting standards

DIN Rail Mounts utilise an industry standardized 35 mm wide metal rail to mount one or more signal conditioners. A Backplane Mount refers to conditioners that can be mounted on a shared backplane with a common connector funnelling multiple output signals (this is a common setup in data acquisition systems.) “Loop Booster”, “signal splitter”, “power supply isolator” are all commonly used when talking about signal conditioners.

Latest Developments for Signal Conditioners

Instrumentation has evolved in leaps and bounds in recent years. Digital signals being favoured over analog signals for a number of reasons. Digital Signals offer a higher resistance to electrical noise distortion can be easily connected to controllers and computers and can transmit over larger distances. Digital formats such as RS232 (Recommended Standard 232), RS485 (Recommended Standard 485) and Ethernet make for easier overall integration into increasingly sophisticated control engineering applications. Ethernet is defined as a collection of computer networking technologies for local area networks. The most obvious advantage of utilising this framework is that the signal can be read across an entire network or even across the internet if so configured.

It is also notable to mention Smart signal conditioners. These components have been designed to accept most common process and temperature sensor inputs. This provides the user with a programmable current or voltage output signal plus dual trip relays.

It is important to sourcing a signal conditioner with the entire system in mind and it is always a good idea to confirm compatibility and efficiency with an instrumentation automation specialist when upgrading your industrial system. asthegirlturns.com, brookscavalier.com, valuetail.com, jemangebio.com

PJ Boner is an instrumentation and calibration company based in Ireland. Products include signal conditioner, data loggers and industrial sensors. http://www.pjboner.com

Nov 12

What Can the Digital Signal 1-DS1-T1 Line Be Used For?

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When it first came out in the 90′s the Digital signal 1 line, or DS1 was used by large companies and phone companies only. However, it’s now used in many different ways and some of them are by normal people who are connecting through their home desktop. First thought up by Bell Labs the DS1 or T1 was a way in which both data and voice signals were able to transmit together.

A DS1 circuit is made up of 24- 8 bit channels which will send and receive information. The information that is coming in from this type of signal can be up to 1.544 megabits a second. Back when it first came out that was a huge jump in the ability of internet connection. Though today there are much higher rates, still this predecessor was one huge leap in technology.

Information on a was framed, either via a super frame idea, where 12-193 bit frames would come across.

Or the extended super frame which doubled the output speed. Both were fabulous, but when this technology first came out it was used only in business. A bit too expensive for a household to undertake the change to this type of technology.

However, as technology moves on, the cost of internet connections and speeds will change. Allowing the DS1 to be used by millions of households. A way in which a mother who works from home can pull up research at faster speeds than she ever imagined. Or how a kid can get information for his next report.

Some businesses do still use the DS1 internet connection. Cell phone companies use it to send the major signal out to all the smaller towers they have located around cities. This makes cell phones work better, and that connection signal you see on your cell stay well above where you need it.

Like any internet connection though, the DS1 is not without problems.

They do have problems in connectivity like anyone else. There are three alarms that will go off depending on the situation of the problem. Red is the one you really do not want to see, it means you have no data coming or going. It’s a loss of connection.

You may see a yellow alarm which isn’t good either; it will show that your location you are getting data from has experienced a red alarm. Though you can still get some things in, you will not be getting them near as quickly. The blue alarm is a way in which you will be able to know that your equipment has a problem with either receiving in data or voice information. When seeing a blue alarm you will need to call in maintenance to fix the problem.

With many types of connections that can be used to get on the Internet, the DS1 Line is only one of those. It is one of the faster that is able to be used on a home computer though. A lot of the components in a regular desktop cannot handle the higher speeds that are being used at present by large business.

The author Ron Legarski is a business consultant for professional agencies.

Oct 21

Affect Satellite Digital Video Broadcast Signal Transmission Main Factors – Satellite, Digital Video

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Of: Guangdong Mr Chan, Satellite digital TV with a large coverage area, transmission of high quality, saving advantages of satellite resources and improve radio and television coverage of the population, a strong impetus to the development of radio and television career. Although satellite digital video broadcasting has many advantages, but the signal transmission is also subject to certain factors, such as natural phenomena, the satellite signal interference between the uplink and downlink transmission system to accept the imperfect system resulting from the impact. Following on the impact of satellite digital video broadcasting (DVB-S) were the main factors of signal transmission to be introduced.

Natural phenomena Satellite digital video broadcasting system is an open communication system, its transmission link is susceptible to the influence of external natural conditions, such as rain, snow days Ling, ionospheric scintillation, solar magnetic storms and so on.

1, the impact of rainfall When the waves through the rain area, rain will generate absorption and scattering of waves, resulting in attenuation, referred to as rain attenuation. Rain attenuation depends on the diameter of raindrops and the wavelength of electromagnetic wave, electromagnetic wave of wavelength and attenuation of rain closer to the larger diameter. Experimental results show that the radius of raindrops between about 0.025 ~ 0.3cm, in the Ku-band, the wave of wavelength about 2.5cm, so Ku-band rain attenuation effect is larger; in C-band, because the wavelength of 7.5 cm, the wavelength is greater than the radius of rain, so rain attenuation is relatively small. Rain attenuation of electromagnetic waves not only, but also the noise caused by temperature increase and the occurrence of depolarization affect the received signal carrier to noise ratio and lead to interference between orthogonally polarized signals increased.

Cloud attenuation caused by rain attenuation is much smaller than that, but to receive Ku band signals for the small caliber of the terminal, which may have been exceeded or the margin between the receiving device.

2, the impact of snow General, unless it is snow, snow and below on the Ku-band satellite signal will not produce significant attenuation (not too thick snow on the feed), but in the process of snow, for the C-band and Ku band satellite transmission, the impact is very significant. Of snow in the process, the antenna feed and main reflector produces uneven snow on the strength of electromagnetic scattering and absorption of different, serious damage to the satellite antenna aperture field uniformity of the distribution function, greatly reduces the gain of the antenna also increases the antenna noise temperature, the uplink EIRP values or receiving system G / T values will be greatly reduced, affecting the transmission quality of the satellite signal. As the snow continued normally Naturalization longer, the gain of the antenna significantly affected, so both the uplink station or downlink stations are required to have taken active measures to prevent and overcome.

3, on the phenomenon of Ling Before and after each equinox and autumnal equinox
, satellite earth stations located around noon every day, the satellite will be in a straight line between the Sun and the Earth. Then satellite earth station antenna in satellite also aimed at the sun (as shown in Figure 1), so that strong electromagnetic waves generated by the sun directly shining on the earth station antenna. Since the sun produces a wide spectrum of electromagnetic waves, so the Earth station for the electromagnetic wave is a large noise source, it will interfere with receiving the satellite signal receiver chain so that the serious deterioration or even interrupted, a phenomenon that is as satellite communications, “Japanese Ling phenomenon.”

Figure 1 Ling day on the duration of the earth station by the decision of the receiving antenna aperture, the greater the receiving antenna aperture, Japan Ling relatively short duration; the other hand, the smaller diameter antenna, the longer the duration. Ling on the received signal to noise ratio on the impact of noise depends on the size of the sun, the operating frequency band width and height. Ling peak of solar activity interference due date the most serious; work the more wide-band noise before the more interference is relatively serious; work the higher the frequency, the greater the noise intensity, for example: Ku-band satellite signal interference by the day is greater than C Ling band seriously. Ling in the day time, solar energy for heating also enables high-frequency antenna feed before the first case temperature, the necessary measures be taken to protect it.

4, the phenomenon of ionospheric scintillation
When the waves travel through the ionosphere, due to the uneven structure of the ionosphere and the random time variation, resulting in signal amplitude, phase, angle of arrival and other characteristics of short-period changes in the formation of ionospheric scintillation. Ionospheric scintillation and frequency, geographical location and solar activity status. In general, ionospheric scintillation in the spring equinox occurs when the most serious around, the more serious after the autumnal equinox. Ionospheric scintillation phenomena usually last 30 minutes to several hours, usually occurs after sunset (18:00) to midnight (24:00) end. Although the ionospheric scintillation 3GHz frequency mainly in the following, but there was a marked effect 4GHz. According to ITU statistics, 4GHz, ionospheric scintillation can cause changes of more than 10dB peak to peak.

On Earth there are two more serious ionospheric scintillation region: 20 degrees within the magnetic equator and high latitudes. China’s Yangtze River and south of the Yangtze River to the north of the ionosphere in parts belong to the peak of activity areas (see Figure 2), ionospheric scintillation phenomena in the region before and after the spring equinox and the autumnal equinox is very obvious in the performance of 4GHz, the peak more than 10 dB, but Under normal circumstances, although the cause of ionospheric scintillation signal quality decreased, and will not cause circuit interruption.

Figure II 5, the phenomenon of solar magnetic storms

Frequent in recent years, a strong solar flare on Earth communications facilities will therefore be part of the interference. Accompanied with the flares, the sun’s surface will produce a powerful coronal mass ejection, jet stream of charged particles produced after the earth’s magnetic field may form a relatively strong geomagnetic storms, satellite operations and communications, interfere with, or even serious will interrupt the satellite signal.

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Aug 18

Better Television Signal With Digital Aerial

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Maybe, you have but some logical thought, that how is that possible? You must therefore have stopped thinking on those lines. As the technology has grown with passage of time, it has become capable of solving the problems and fulfilling the wishes of man. Therefore, you also can fulfill your wish with digital aerial satellite TV connection. Television viewing would become a whole new experience with its help. It can completely change the way you watch television. With satellite TV, you can get clear picture just as you find in a cinema hall. The sound has as much clarity as Dolby Digital sound. All these are possible because of the digital aerial signal received by your television, which also allows you to retune the television set for the want of a better quality signal.

You might be staying in a house with lack of open space on the roof. Although installing the dish antenna of the satellite TV in a house without any roof space could be a problem but not any more. The service provider of the satellite TV will help in the process of installation by putting the antenna on a tile or slate clamp mount. They will also be able to place them on chimney bracket and in need, at brick brackets in some corner of your residence. Because of the different provisions available now the installation of the aerial digital dish antenna is no longer a big problem. The work of installation is done by the service provider of your dish TV and does not need your interference.

The antennas that you used previously might have been not so long lasting as well as loaded with problems giving you a bad experience. The digital aerial services install long lasting aerials giving out high quality signals for uninterrupted television viewing. Sometimes one does not receive high quality sounds and images on the Television sets and this is due to the use of faulty cables. Even if the installed digital aerial dish is of very high quality but still if the cable gets damaged due to some reason then the Dish TV will no longer receive good transmission of pictures and sound. The service provider will immediately replace the faulty transmission wires for good quality pictures and signals.

The final task in quality viewing of television is the right choice of television set. The digital aerial service provider will also help you in this regard. The service providers will fix your Tv on the wall of your choice. A good quality TV also helps in increasing the quality of picture and images transmitted by the dish TV. Digital satellite TV has changed the aspect of television viewing from a boring home atmosphere to an enthralling theatre surrounding.

Know more about digital aerial.

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