Digital Storage Oscilloscope Working Principle

digital Storage Oscillo do main Working dogmaOscillo background foreshadowizes be utilise to measure electric signals to display it as wave forms. Oscilloscope is k instantern as scope and its most common economic consumption is to observe signal. It was invented by Karl Braun in 1897. There ar some(prenominal) number reachs in the market such as digital, line of latitudes, dual beam, conf apply signal etc but the main focus on the report is digital computer storage orbit. A digital reach is a bill instrument that uses binary program numbers which writes to samples of the voltage. Digital oscilloscope is affected by bandwidth e.g. as the frequency is increase the oscilloscope verity decreases. Its also affected by sample dictate, e.g. The quicker it preempt sample, the accu reckon the results atomic number 18 displayed for refrain signal. The digital storage oscilloscope (DSO) is of the three digital oscilloscopes but DSO is the conventional form of digital oscill oscope. Its shield out is like a computer monitor or TV screen as it uses raster typesetters case screen. 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 surpass and position the wave shape. Next this signal is apply to an analogue to digital converter (ADC).(www.Radio-electronics.com). The DSO is easy to set up. The digital storage oscilloscope has numerous watchs, e.g. Switch, condemnation / DIV, Trigger controls, military strength and focus, CH I and CH II inputs, VOLTS / DIV etc. The DSO in comparison with Digital Phosphor Oscilloscope has less(prenominal) bandwidth, less sample put but same channels etc.AimsTo understand the basics around digital storage oscilloscopeTo be qualified to operate an digital storage oscilloscopeTo be able to set-up an oscilloscopeTo be able understand the designs of digital storage osc illoscopeTo be able to understand advantages and disadvantages of varied types of oscilloscopeIntroductionOscilloscopes 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 offset controls and finally the display screen (the screen consists of cathode ray tube). The research on oscilloscope has been done through and 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 enabl es tear down noise along with increased entropy points on 5x oversampled 20 GHz acquisitions (http//www.prlog.org/11013155-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 deeds, 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 restriction to performing just like an analogue oscilloscope. There is a limit to the frequency which it undersurf ace work up to. The limits of frequency are affected by analog bandwidth front-end section which is known as -3 dB pointand sampling rate of the oscilloscope,the samples is taken in regular breaks. When the sample rate is high, the frequency increases on screen.Factors affecting the frequency of digital oscilloscopeBandwidth specificationOscilloscope sample rateBandwidth specificationThe 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 megahert z of signals.Oscilloscope sample RateThe 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 oscilloscopeThe 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. (Ian P (2004) oscilloscope types internet. Available fromhttp//www.radio-electronics.com/info/t_and_m/oscilloscope/oscilloscope_types.ph p date accessed 18/10/10). 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 frequently 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 import ant 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 depart, 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 operator there is a signal processor. With having a signal processor it helps to process the signal in dissimilar ways, before it passes the display memory and the display.Digital storage oscilloscopewww.doctronics.co.ukControls of digital storage oscilloscope harbor this is where all the waveform signals are displayed by using the X axis and Y axis.www.photoshelter.comSwitch to put to work ON the oscilloscope and to turn OFF.X-Y control its used to display component character istic 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 treetop lowest gives square wave at 0.2V peak to peak but the lower terminal gives square wave of 2V 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 downInvert when its revoke the waveform signal on th e 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 today to the Y-amplifier of the corresponding channel, CH I or CH II. In the AC position, a capacitor is connected into the signal roadway so that DC voltages are blocked and only changing AC signals are displayed (www.doctronics.co.uk)Trace alternative switches settings of control switches for oscilloscope screen.How to set up an oscilloscopeFirst 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 AUTOSelect the trigger source to INT (the Y input, internal)Put 5V/cm at the Y-AMPLIFIERPut 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 FOCUSnow the oscilloscope is ready to gohttp//www.kpsec.freeuk.com/cro.htmDigital storage oscilloscopeDigital Phosphor Oscilloscope100MHz 200MHz bandwidth500 MHz, ccc MHz, 100 MHz bandwidth2GS/s Real time sample rate5 GS/s sample rate2 or 4 impart2 or 4 ChannelsIt rapidly documents and examines Measurement. Its results with OpenChoice Software or Integrated CompactFlash Mass Storage21 Automatic MeasurementsFFT Standard on All ModelsFFT for Frequency and Harmonic Analysis groundbreaking Triggers to lovesomely Capture the Event of InterestAdvanced Triggers, such as, Glitch, Width, and LogicFull VGA Color LCD on all ModelsMulti-Language User interface built-in Floppy Disk Drive for Easy Storage and DocumentationQuick Menu User Interface Mode for Quick, Easy OperationTraditional, Analog-style Kno bs and Multilanguage User Interface for Easy Operation9-bit Vertical ResolutionQuick Setup and Operation with Auto set Menu, Auto range, Waveform and Setup Memories, and Built-in, Context-sensitive HelpTelecommunications Mask interrogatory (TMT)Backlit Menu Buttons for High VisibilityExtended Video Application Module11 of the Most censorious Automatic Waveform MeasurementsSupport for Active Probes, Differential Probes, and Current Probes that Provide Automatic Scaling and Units8 Hours of Continuous Battery Operation with Two Batteries Installed, Hot Swappable for Virtually Unlimited Freedom from AC disputation PowerOptional Power Application Software offers the Broadest Range of Power Measurements at its Price stainDigital Phosphor Oscilloscopehttp//infrared.als.lbl.gov/content/PDF/equipment/Tektronix_TDS3052_Data_Sheet.pdfDigital storage oscilloscopehttp//www2.tek.com/cmswpt/psdetails.lotr?ct=pscs=psuci=13304lc=EN