Factors Affecting The Frequency Of Digital Oscilloscope Information Technology Essay

Factors Affecting The Frequency Of Digital Oscilloscope Information Technology Essay Oscilloscopes are measuring equipment which displays electric waveforms on a screen like a small Television.   An oscilloscope is known as CRO, DSO, scope or an O-scope. Its common usage is to observe wave shapes of signal. There are four sections in an oscilloscope: the vertical and horizontal controls trigger controls and finally the display screen (the screen consists of cathode ray tube).   The research on oscilloscope has been done through books, internet, magazines etc. Karl Braun was the inventor of oscilloscope in 1897 (http://inventors.about.com/od/bstartinventors/a/Karl_Braun.htm). The main sector oscilloscopes used in are engineering, medicine, telecommunications and science. In October 2010 Tektronix Inc manufacturer of oscilloscopes discovered that Series of digital and mixed signal oscilloscopes that now deliver 100 GS/s sampling rate performance. This enables lower noise along with increased data points on 5x oversampled 20 GHz acquisitions (http://www.prlog.org/11 013155-tektronix-raises-bar-for-oscilloscope-sampling-rates-signal-integrity.html) There are several numbers of oscilloscope e.g. digital, analogues, dual beam, mixed signal etc.   This reports main focus will be the design and operating principle of digital storage oscilloscope.   Firstly the report will look into how the oscilloscope works, and then it will follow on to how its designed and finally how to set it up. A digital oscilloscope is a measuring instrument that uses binary numbers which writes to samples of the voltage.   ADC (analogue to digital converter) is used to change the analogue data into digital data then it makes the signal digitally.   For it to be displayed in the screen its then converted back to analogue. A digital oscilloscope has its limitation to performing just like an analogue oscilloscope.   There is a limit to the frequency which it can work up to. The limits of frequency are affected by analog bandwidth front-end section which is known as -3 dB point  and sampling rate of the oscilloscope,  the samples is taken in regular breaks.   When the sample rate is high, the frequency increases on screen.  Ã‚   Factors affecting the frequency of digital oscilloscope: Bandwidth specification Oscilloscope sample rate Bandwidth specification The bandwidth specification determines the frequency range which the scope (oscilloscope) measures accurately in the display. As the frequency is increasing the oscilloscope accuracy decreases. The bandwidth is mainly defined as a drop of 3 decibels (dB) or sensitivity at lower frequency at 0.707. Bandwidth in Hz x rise time in seconds = 0.35. E.g. to resolve an oscilloscope pulses with the rise of 2 nanosecond would have a bandwidth of 700MHz. but for a digital oscilloscope the sampling rate would have to be ten times higher frequency to resolve. E.g. 10megasample/second would measure up to 1 megahertz of signals. Oscilloscope sample Rate The oscilloscope sampling rate indicates on digital oscilloscopes how many samples per second the analog to digital converter can gain. The quicker it can sample, the accurate the results are displayed for fast signal. The maximum sample rate is given by MS/s which is mega samples per second. The minimum sample rate might come in handy if you need to look at signals changing slowly. The sampling rate can be change by the controls (sec/div) on the oscilloscope. Digital storage oscilloscope The digital storage oscilloscope is of the three digital oscilloscopes but DSO is the conventional form of digital oscilloscope. Its screen is like a computer monitor or TV screen as it uses raster type screen. By using the raster screen its helps to display images that fill the whole screen and it may include text on the screen. (www.Radio-electronics.com). First you have to store the waveform in the digital format to get the raster type display on screen. As a result of storing the waveform form digitally it can be processed by the oscilloscope or by connecting to a computer. This enables a high degree of processing to be achieved, and the required display provided very easily and often with a very cheap processing platform. It also enables the waveform to be retained indefinitely, unlike the analogue scopes for which the waveform could only be stored for a very limited time. (www.Radio-electronics.com). The operation of the digital storage oscilloscope is pretty simple, The first stage the signal enters within the scope is the vertical amplifier where some analogue signal conditioning is undertaken to scale and position the waveform. Next this signal is applied to an analogue to digital converter (ADC). (www.Radio-electronics.com). The samples are taken at regular intervals. The sampling rate is important because it determines the resolution of the signal. The samples are taken in per second or MS/s (mega sample rate). All the samples are stored within is the oscilloscope as waveform points, and several samples of waveform make up a single waveform point. The overall waveform is stored as a waveform record and its start is governed by the trigger, its finish being determined by the horizontal time base time. (www.Radio-electronics.com). The digital storage oscilloscope is an in the digital format which means there is a signal processor. With having a signal processor it helps to process the signal in different ways, before it passes the display memory and the display. Digital storage oscilloscope www.doctronics.co.uk Controls of digital storage oscilloscope Screen this is where all the waveform signals are displayed by using the X axis and Y axis. www.photoshelter.com Switch to turn ON the oscilloscope and to turn OFF. X-Y control its used to display component characteristic curves. Its mainly used for output position. TV-separation it allows the display to be shown on TV system so it can compare signals different points. TIME / DIV by using this control V/t graph horizontal scale can be changed. Trigger controls it allows the oscilloscope display to be coordinated with the signal you want to look into. Intensity and focus this control is used to change the brightness of the scope by adjusting it. X-POS by using this control the whole V/t graph can be moved side to side. X-MAG horizontal scale of the V/t graph is increased by 10 times in the IN position. CAL outputs -the top terminal gives square wave at 0.2  V peak to peak but the lower terminal gives square wave of 2  V peak to peak at 50 Hz. Component tester A changing voltage is provided by the output socket to allow component characteristic curves to be displayed. Y-POS I and Y-POS II this control allows the resultant outcome to move up or down Invert when its invert the waveform signal on the screen is turned upside down. CH I and CH II inputs using the BNC plugs the signals are connected to the BNC input socket. The smaller socket is called earth or ground. VOLTS / DIV independently the vertical scales for CH I and CH II can be adjusted. DC/AC/GND slide switches In the DC position, the signal input is connected directly to the Y-amplifier of the corresponding channel, CH I or CH II. In the AC position, a capacitor is connected into the signal pathway so that DC voltages are blocked and only changing AC signals are displayed (www.doctronics.co.uk) Trace selection switches settings of control switches for oscilloscope screen. How to set up an oscilloscope First you warm up the oscilloscope by switching it on. At this stage do not connect any input leads. Select the DC/AC/GND switch to DC (the Y-input) Select the X-Y/SWP to SWP (sweep) Put the trigger level to AUTO Select the trigger source to INT (the Y input, internal) Put 5V/cm at the Y-AMPLIFIER Put the TIMEBASE to 10ms/cm Select 1 or Cal for the time base VRIABLE control. to map out the middle of the screen adjust the Y-SHIFT (up/down) and X SHIFT (left/right) to brighten up the focus adjust the INTENSITY and FOCUS now the oscilloscope is ready to go http://www.kpsec.freeuk.com/cro.htm Digital storage oscilloscope Digital Phosphor Oscilloscope Bandwidths 100  MHz 200  MHz 500 MHz, 300 MHz, 100 MHz Sample rate 2  GS/s Real Time 5 GS/s Channels 2 or 4 Channels 2 or 4 Channels 8 Hours of Continuous Battery Operation with Two Batteries Installed, Hot Swappable for Virtually Unlimited Freedom from AC Line Power Full VGA Color LCD on all Models Optional Power Application Software offers the Broadest Range of Power Measurements at its Price Point Built-in Floppy Disk Drive for Easy Storage and Documentation Measurement Quickly Document and Analyze Measurement Results with OpenChoice ® Software or Integrated CompactFlash ® Mass Storage 21 Automatic Measurements Fast Fourier Transform FFT Standard on All Models FFT for Frequency and Harmonic Analysis Triggers Advanced Triggers to Quickly Capture the Event of Interest Advanced Triggers, such as, Glitch, Width, and Logic Traditional, Analog-style Knobs and Multilanguage User Interface for Easy Operation Multi-Language User Interface Quick Setup and Operation with Auto set Menu, Auto range, Waveform and Setup Memories, and Built-in, Context-sensitive Help Quick Menu User Interface Mode for Quick, Easy Operation Backlit Menu Buttons for High Visibility 9-bit Vertical Resolution 11 of the Most Critical Automatic Waveform Measurements Telecommunications Mask Testing (TMT) Centronics Port Standard on all Models for Quick, Convenient Hardcopies Extended Video Application Module Support for Active Probes, Differential Probes, and Current Probes that Provide Automatic Scaling and Units Digital Phosphor Oscilloscope http://infrared.als.lbl.gov/content/PDF/equipment/Tektronix_TDS3052_Data_Sheet.pdf Digital storage oscilloscope http://www2.tek.com/cmswpt/psdetails.lotr?ct=pscs=psuci=13304lc=EN

Torquato Tasso :: Essays Papers

Torquato Tasso The life of Torquato Tasso (1544-1595) can at best be called unfortunate. Born in Sorrento on the eleventh of March to Bernardo Tasso, himself a poet of some esteem and a member of the very minor nobility, Torquato was able to benefit from the education that was available to those of his station. He studied at the court of Duke Guibaldo II delle Rovere of Urbino until 1560, when, at his father's request, he left to study law and philosophy at the University of Padua. It was during this time that Torquato Tasso (Tasso) wrote his first major romantic poem â€Å"Rinaldo†, which dealt with the stories of Charlemagne. Tasso's father, upon reading this manuscript relieved Tasso of his legal and philosophical studies so that he might further explore and develop his poetic talents. Thus, Tasso enrolled at the University of Bologna in 1563, and after three years of study, became a courtier of Cardinal Luigi d’Este at Ferrara, under whose patronage, Tasso thrived in what could probably be called the happiest years of his life. Later, he entered into the service of the Cardinal's brother, Alfonso II, duke of Ferrara. It was at this time that Tasso produced his â€Å"L'Aminta† and his masterwork about the First Crusade, La Gerusalemme liberata (Jerusalem Delivered), which was completed between 1559 and 1575. However, it was through this work that Tasso's life and work would no longer be his to control. While in the process of completing his masterpiece, Tasso sent out portions to his friends and other critics for their evaluations and suggestions. The responses that he received were altogether unfavorable and the work was very harshly criticized, even to the point that some of the clergy dubbed Tasso a heretic for writing it. Tasso, sensitive to this criticism, fell into an unhealthy state of depression and melancholy and was prone to fits of irritability and instability. His condition was made worse by the knowledge that some of the critics who had criticized his work began to publish pieces of it publicly. His condition at one point reached such a state that one night in 1577 Tasso stabbed one of his servants who he believed to be spying on him. After this incident, Tasso was jailed but later escaped and fled to his sister's house in Sorrento.

Definition of X- Internet Essay

Many people think the Internet and the Web are the same thing. They’re not. The Internet is a piece of wire that goes from me to you and from me to 300 million other people in the world. The Web is software that I put on my end of the wire, and you put on your end — allowing us to exchange information. While the Internet (the wire) evolves gradually, the software on the wire can change quickly. Before the Web, other software was clamped onto the Internet. WAIS, Gopher, and Usenet were the dominant systems, and there were companies that were doing commerce using those software models. I call this the â€Å"executable Internet,† or X Internet, for short. X Internet offers several important advantages over the Web: 1) It rides Moore’s Law — the wide availability of cheap, powerful, low real-estate processing; 2) it leverages ever dear bandwidth — once the connection is made, a small number of bits will be exchanged, unlike the Web where lots of pages are shuttled out to the client; and 3) X Internet will be far more peer-to-peer — unlike the server-centric Web. This scenario could be marred by two threats: viruses and lack of standards. Once executables start to move fluidly through the Net, viruses will have perfect conditions to propagate. Standards, or rather the lack thereof, will block the quick arrival of X Internet. I can’t see Microsoft, Sun, IBM, or other traditionalists setting the standards. The Web-killer’s design will emerge from pure research, academe, or open source — as did the Web. What It Means — No. 1: Web-centric companies get stuck holding the bag. They will wake up one day with hundreds of millions of dollars of legacy code on their hands. Yes, their brands will remain intact, but their technology will suddenly be very outmoded. Yahoo!, eBay, and AOL will find themselves competing with a new wave of commerce players that market, deliver, and service using the superior technology of X Internet. One of the upstarts will Amazon Amazon. What It Means — No. 2: Investors get happy. The new wave of startups will race to market with X Internet, blasting old Web infrastructure and commerce companies out of their path. Internet creative destruction, round two. What It Means — No. 3: Peer-to-peer (P2P) networking rockets. The X Internet’s â€Å"smarts everywhere† design will enable an epidemic of Napstering. Courts, legislators, governments, companies, and other rule makers will have to contend with an empowered and ever more  liberated, unruly populace — armed with technology that allows them to bypass economic toll roads and bridges. What It Means — No. 4: If you are a Global 2,500 company, get ready for another round of change. This means: 1) overhauling the skills of your technologists; 2) destroying perfectly good Web sites in favor of the X Internet; 3) dumping Web-centric suppliers; and 4) retooling organizations. Change management will get a new test. As the Internet expands, two new waves of innovation — comprising what Forrester calls the X Internet — are already eclipsing the Web: an executable Net that greatly improves the online experience and an extended Net that connects the real world. An executable Net that supplants today’s Web will move code to user PCs and cause devices to captivate consumers in ways static pages never could. Today’s news, sports, and weather offered on static Web pages is essentially the same content presented on paper, making the online experience more like reading in a dusty library than participating in a new medium. The extended Internet is reshaping technology’s role in business through Internet devices and applications which sense, analyze, and control data, therefore providing more real-time information than ever before about what is going on in the real world. The X Internet will not be a new invention, but rather the evolution of today’s Internet of static Web pages and cumbersome e-commerce mechanisms into a Net that relies on executable software code to deliver more interactive experiences. Executable Internet applications use downloaded code like Java and XML to enhance the user experience with pop-up menus, pick lists, graphics and simple calculations, according to a recent Forrester report entitled â€Å"The X Internet.† An easy way to understand how the X Internet will work is to imagine that a band wants to distribute asong over the Net. Rather than worrying about which audio player people want to use, an executable file will deliver the song and the audio player at the same time. â€Å"With an executable, you can distribute movies the same way you distribute songs,† Forrester research director and report author Carl Howe told NewsFactor Network. â€Å"It just makes the models work better.† Building the X-Net The report also employs an example of a person building a house. With today’s  Internet, a builder would have to find, then try to follow, an article detailing how to frame a window. When it was time to installthe bathroom, the would-be plumber would then have to find an article dealing with that topic. Executable Internet applications would demonstrate to a builder, step-by-step, how to frame a window. When it came time to install the bathroom, the carpenter would simply be replaced by a plumber. â€Å"Instead of reading a book, you have a conversation about the work you’re trying to do,† Howe wrote. Forrester is also predicting the widespread adoption of another X Internet — but this X stands for â€Å"extended.† The extended Internet will include the widespread adoption of real-world appliances, like air conditioners or car tires, that communicate with owners or manufacturers via the Internet. The extended Internet will come with the inclusion of cheap sensors in thousands of everyday products, an era that will begin around 2005, Forrester predicts. Many people think the Internet and the Web are the same thing. They’re not. The Internet is a piece of wire that goes from me to you and from me to 300 million other people in the world. The Web is software that I put on my end of the wire, and you put on your end — allowing us to exchange information. While the Internet (the wire) evolves gradually, the software on the wire can change quickly. Before the Web, other software was clamped onto the Internet. WAIS, Gopher, and Usenet were the dominant systems, and there were companies that were doing commerce using those software models. I call this the â€Å"executable Internet,† or X Internet, for short. X Internet offers several important advantages over the Web: 1) It rides Moore’s Law — the wide availability of cheap, powerful, low real-estate processing; 2) it leverages ever dear bandwidth — once the connection is made, a small number of bits will be exchanged, unlike the Web where lots of pages are shuttled out to the client; and 3) X Internet will be far more peer-to-peer — unlike the server-centric Web. This scenario could be marred by two threats: viruses and lack of standards. Once executables start to move fluidly through the Net, viruses will have perfect conditions to propagate. Standards, or rather the lack thereof, will block the quick arrival of X Internet. I can’t see Microsoft, Sun, IBM, or other traditionalists setting the standards. The Web-killer’s design will emerge from pure research, academe, or open source — as did the Web. What It Means — No. 1: Web-centric companies get stuck holding the bag. They will wake up  one day with hundreds of millions of dollars of legacy code on their hands. Yes, their brands will remain intact, but their technology will suddenly be very outmoded. Yahoo!, eBay, and AOL will find themselves competing with a new wave of commerce players that market, deliver, and service using the superior technology of X Internet. One of the upstarts will Amazon Amazon. Wireless Networked Digital Devices The proliferation of mobile computing devices including laptops, personal digital assistants (PDAs),and wearable computers has created a demand for wireless personal area networks (PANs).PANs allow proximal devices to share information and resources.The mobile nature of these devices places unique requirements on PANs,such as low power consumption, frequent make-and-break connections, resource discovery and utilization, and international regulations. This paper examines wireless technologies appropriate for PANs and reviews promising research in resource discovery and service utilization. We recognize the need for PDAs to be as manageable as mobile phones and also the restrictive screen area and input area in mobile phone. Thus the need for a new breed of computing devices to fit the bill for a PAN. The above devices become especially relevant for mobile users such as surgeons and jet plane mechanics who need both hands free and thus would need to have â€Å"wearable† computers.This paper first examines the technology used for wireless communication. Putting a radio in a digital device provides physical connectivity;however,to make the device useful in a larger context a networking infrastructure is required. The infrastructure allows devices o share data,applications,and resources such as printers, mass storage, and computation power. Defining a radio standard is a tractable problem as demonstrated by the solutions presented in this paper. Designing a network infrastructure is much more complex. The second half of the paper describes several research projects that try to address components of the networking infrastructure. Finally there are the questions that go beyond the scope of this paper, yet will have he greatest effect on the direction,capabilities,and future of this paradigm. Will these networking strategies be incompatible, like he various cellular phone systems in the United States, or will there be a standard upon which manufacturers and developers agree, like the GSM (global system for mobile  communication)cellular phones in Europe? Communication demands compatibility, which is challenging in a heterogeneous marketplace. Yet by establishing and implementing compatible systems, manufacturers can offer more powerful and useful devices to their customers. Since these are, after all, digital devices living in a programmed digital world, compatibility and interoperation are possible. Introduction to X internet : X internet seminar topic explains about concept of new generation internet applications and its updations in software and hardware technologies. Concept of x internet will help in different aspects of businesses, education and power full ways then present standards that we see in internet. Using this technology users can connect to physical objects by adding intelligent technologies which will increase connectivity between humans and physical objects. In this paper we provide detailed explanation on the extended internet, advanced cooperative wireless technology, context awareness, built in intelligence and more.

Kill A Mockingbird, By Harper Lee - 1071 Words

George Washington once said, â€Å"I hope ever to see America among the foremost nations of justice and liberality†. While America has yet to reach an era where injustice is nearly or completely eradicated, we have most definitely progressed from the Great Depression in the 1930s and World War II. In World War II there was a black American fighter pilot group, named the Tuskegee Airmen, who suffered the racial prejudices of America despite fighting for America. Similarly, injustice is widespread in Maycomb County, a fictional town set in the Great Depression of the 1930s. In Harper Lee’s novel To Kill a Mockingbird characters, like Scout and Atticus, face injustices that they must overcome. Similarly, in the Achieve 3000 article â€Å"America Says†¦show more content†¦Furthermore, Uncle Jack finally listens to Scout’s side of the account and Scout pleads, â€Å"‘Promise you won’t tell Atticus about this†¦ I’d ruther him think we were fightin’ about somethin’ else instead’† (Lee 114). Satisfied that her side of the story has been heard, she turns her focus to wanting to protect her father from the ugliness of the town and her own family. Scout perseveres in the end when Uncle Jack omits the real story from his conversation with Atticus. allowing Scout to finally overcome the situation. Scout’s perseverances through this injustice reveals her growing maturity; however, Atticus also witnesses injustices and perseveres. Atticus Finch, another character in To Kill a Mockingbird, is trapped in a racist society that unjustly lashes out at him when he does what he believes in, but he continues to keep his head up and overcomes their bias. For example, on a Saturday when Scout and Jem walk by Mrs. Dubose’s house while on their way to town, Mrs. Dubose yells at them, â€Å"‘Your father’s no better than the niggers and trash he works for!’† (Lee 13 5). Mrs. Dubose is only one of several people who attack Atticus for doing what he believes in, which is treating everyone fairly. Atticus tries to uphold his own moral code but only receives hostility for it. The backlash from the community is solely out of prejudice and is completely unjustifiable; if anything, he deserves