You should see the startup menu, which includes softkeys buttons directly under the crt screen labeled getting started, using quick help, about oscilloscope, and language. Under write to oscilloscope memory, select the memory location where you intend to send the data. Lets study in more detail each component of the oscilloscope. Cathode ray tube testing and monitoring using an oscilloscope. Notes cathode ray oscilloscope pdf figure nokia 5233 pdf reader mobile9 4 shows the structure, and the main components of a cathode ray tube crt. Decibel db a unit of measurement usually used to show a ratio of input signal power or voltage to output signal power or volt. The pcb was mainly designed to drive a 2inch to 3inch oscilloscope crt, but some 5inch crts will work. For more information, or to get started using your own oscilloscope, take a look. The cathode ray tube is similar to a television picture tube and acts as the oscilloscope display. In my senior year of high school, i ripped apart an old crt monitor and replaced the horizontal drive signal with the output of an audio amplifier.
To study the cro and measure the frequency and amplitude. Beginner oscilloscope tutorial contd once youve learned the basic oscilloscope controls, here are a few other things that you should know about. From an open instrument server window, click write. Last semester i was given a decommissioned hp 1662as logic analyzer oscilloscope from mit. A crt makes available a large number of electrons which are accelerated to high velocity and are brought to focus on a fluorescent screen where it produces a spot when strikes it. An oscilloscope contains a cathode ray tube crt, in which the deflection of an electron beam that falls onto a phosphor screen is directly proportional to the voltage applied across a pair of parallel deflection plates. The electron gun produces a beam of highspeed electrons focused to a small spot on the screen. A chemical phosphor coated on the crt creates a glowing trace wherever the beam hits. Feb 12, 2017 a cathode ray tube, or crt, is one of the earliest forms if not the earliest form of electronic display.
Data values for all times above or below the frequencies in the dataset appear as zero. Analog oscilloscope an instrument that displays a waveform by applying the input signal conditioned and amplified to the vertical axis of an electron beam moving across a cathoderay tube crt screen horizontally from left to right. A measurement of this deflection yields a measurement of the applied voltage. The oscilloscope crt works in a similar fashion, but rather than coils, there are internal deflection plates, horizontal and vertical. This tube, is commonly used to obtain a visual display of.
Cathode ray tube testing using an oscilloscope august 28, 2017 by david herres leave a comment the cathode ray tube crt is what made possible tvs, computer monitors, and oscilloscopes as we know them. On digital scopes, there may be a pushbutton, but you may have to locate the options in a menu. Cathoderay tube crt vertical amplifier horizontal amplifier sweep generator. To obtain a stable picture on the crt screen, the ramp waveform has to be in phase with the signal that you want to observe. On older analog scopes, these are mostly controlled by a dedicated switch for each function. Example 7 on an accelerated electron see lesson 1 describes a portion of a cathode ray tube crt. Oscilloscope lexicon learning how to use an oscilloscope means being introduced to an entire lexicon of terms. Operation and applications oscilloscope operation x vs y mode, oscilloscope operation voltage vs time, chop mode or alternate mode, pdf. The manual provided with your oscilloscope will give you more specific information. I think this is more akin to an oscilloscope crt, so there isnt a real video format to convert from.
To see the front panel of the oscilloscope in more detail, open the pdf file for this lab on the course web page and use adobes magnify option. An oscilloscope, previously called an oscillograph, and informally known as a scope or oscope, cro for cathoderay oscilloscope, or dso for the more modern digital storage oscilloscope, is a type of electronic test instrument that graphically displays varying signal voltages, usually as a twodimensional plot of one or more signals as a function of time. As used in an oscilloscope, its a funnelshaped glass bottle with a flat bottom which is the screen and a long, narrow neck. Looking at the face of the instrument, you are viewing the screen that the electron beam strikes. Jan 25, 2016 last semester i was given a decommissioned hp 1662as logic analyzeroscilloscope from mit. Simple homemade crt oscilloscopes are not all that difficult to design and build. The electron beam creates a bright dot on the face of the cathode ray tube. Cathode ray tube crt, working, construction, applications. Y deflection block diagram of the crt the oscilloscope. The measured values are displayed as a waveform by a cathoderay tube crt or a display, or they can be processed and stored as a digital data stream. On older analog scopes this is a cathoderay tube or crt.
Oscilloscope basics all oscilloscopes share certain basic features. Buy the catahoula technologies oscilloscope crt driver pcb. In an oscilloscope, the beam is deflected horizontally x by a. The basic component of an oscilloscope is the cathoderay tube crt, figure 1. Oct 26, 2011 had an old dell crt monitor laying in the corner and decided to do something with it. The following should give the student some familiarisation with the function nora roberts novels pdf and uses of the cathode ray. Short descriptions of the available features are as follows. An oscilloscope is analogous to a camera that captures signal images that we can then observe and interpret. The cathode ray oscilloscope introduction the following should give the student some familiarisation with the function and uses of the cathode ray oscilloscope c. The crt is a special type of vacuum tube in which electrons, emitted when the cathode is heated, are shaped into a narrow beam and accelerated to a high velocity before striking a phosphorcoated screen. The crt is the heart of the cro providing visual display of an input signal waveform. I have an old philips pm3232 oscilloscope with the following display trouble. I have studied various designs dating back to the thirties and had an interest in developing a simple crt oscilloscope that the electronics hobbyist could build with readily available parts today. The images may represent electrical waveforms oscilloscope, pictures television, computer monitor, radar targets, or other phenomena.
Talks about how crt s work, how an oscilloscope works, and how to use an oscilloscope to troubleshoot circuits like amplifiers, and to adjust radio transmitters and receivers. The crt oscilloscope the cathode ray tube oscilloscope, the horizontal and vertical inputs, the time base generator, the trigger, oscilloscope input impedance, oscilloscope probe, pdf file the oscilloscope. Energized the native oscilloscope circuit to illuminate the scope display grid. This tube, is commonly used to obtain a visual display of electronic information in oscilloscopes, radar systems, television. Simple diy oscilloscope plans mymydiy inspiring diy.
Decibel db a unit of measurement usually used to show a ratio of input signal power or voltage to output signal power or voltage. Cros are in fact very fast xy plotters, displaying an input signal versus another signal versus time. Consider a simple sine wave electrical signal from some source as in fig. Talks about how crts work, how an oscilloscope works, and how to use an oscilloscope to troubleshoot circuits like amplifiers, and to adjust radio transmitters and receivers. It is made of the following functional parts see gur e a. The heart of the oscilloscope is a cathode ray tube or crt, of the sort you have already studied. The oscilloscope places an image of the timevarying signal on the screen of a cathode ray tube crt allowing us to observe the shape of the signal and measure the voltage at di. The cathode ray tube crt consists of an electron gun, deflecting apparatus, and luminescent screen. How to use a crt oscilloscope other devices wonderhowto. What is crt and what is its use in an oscilloscope.
Also a good tool to create lissajous figures and explore them. Hello, and welcome to my latest project turning a small crt monitor into a fully functional oscilloscope. Had the idea in my head to make an oscope, and i found online that there were others that had already done it. Committed to excellence california state university. The p19 is a orange phosphor of moderate duration used mainly for military radars. The cathode ray tube or crt is a vacuum tube of special geometrical shape which converts an electrical signal into a visual one. Mar 16, 2007 oscilloscope built from an old monitor. This homemade oscilloscope features a max frequency of 7 khz, up to four channels, a variable trigger voltage, and an 8bit resolution. Cro working principle and construction cro in hindi.
General oscilloscope instruction manual description the model psxx0xx1xx5 oscilloscope is a dualchannel oscilloscope with frequency bandwidth 20100 mhz at 3db. Philips pm3232 oscilloscope, display trouble electronics. The central unit of the oscilloscope is the cathoderay tube crt, and the remaining part of the cro consists of the circuitry required to operate the cathoderay tube. Electronic circuits in the scope apply voltages to one set of deflection plates to sweep the. There are schematics and diagrams provided to make it easy for you. The cathode ray oscilloscope cro is a very useful and versatile laboratory instrument used for display, measurement and analysis of waveforms and other phenomenon in electrical and electronics circuits. Cathode ray oscilloscope is a very useful and versatile laboratory instrument used for display, measurement and analysis of waveforms and other phenomena in electrical and electronic circuits. Oscilloscope hm 3033 tektronix 2445 oscilloscope operators instruction manual mit mit. Just unzip all files in a folder on your pc and run the executable. Then answer the questions in assignment questions 18 in the lab manual exp 6 about oscilloscope and crt theory. Since its invention more than 100 years ago, new types, features and functionalities have been introduced. It modulates, accelerates, and deflects electron beams onto the screen to create the images. Key oscilloscope specifications some scopes are better than others.
A cathode ray tube, or crt, is one of the earliest forms if not the earliest form of electronic display. Softscope software is a simulator of a vintage oscilloscope. The oscilloscope consists of the following major subsystems. The deflection of the oscilloscope beam is proportional to the input voltage. On this page well introduce some of the important oscope buzzwords you should be familiar with before turning one on. The crt clocktvscope is the result of efforts to develop a reasonably simple circuit that incorporates a few common and fun uses of an electrostatic crt. Crt oscilloscope lcd mod motivation matts projects. However, it is possible to convert current, strain. Working of crt heater element is energized by alternating current to obtain high emission of electron from cathode. The cathode ray tube oscilloscope is essentially an analog1 instrument that is able to measure time varying electric signals. Block diagram of a cathoderay oscilloscope figure 1 cathoderay tube the electron gun or electron emitter, the deflecting system and the fluorescent screen are the three major. Basic oscilloscope operation this worksheet and all related files are.
The display of the oscilloscope shows the amplitude usually voltage of a signal on the yaxis, and time along the xaxis. This tube, is commonly used to obtain a visual display of electronic information in oscilloscopes, radar systems, television receivers, and computer monitors. The core of an analog oscilloscope is a special type of vacuum tube known as a cathode ray tube, or. During this process i will talk about how a crt tv actually works and how we can. Control grid is bised negative with respect to cathode it controls the density of electron beam to focus the electron beam on the screen focusing anode is used. Overview of an oscilloscope an oscilloscope is an electronic test instrument that displays the value of an electric signal over time. If we can arrange things so that this sinusoidal voltage is applied. This is quite a nice piece of test equipment, if not a little bit old made in the early 90s. A cro is an electronic device with a crt as its main component and other associated circuits consisting of a power supply unit, a sawtoothwave generator, horizon and vertical amplifiers. Graticule illumination can be adjusted according to brightness of circumstance. An oscilloscope crt is much smaller than a tv crt because the screen is smaller and the electron beam does not travel as far. The oscilloscope places an image of the timevarying signal on the screen of a cathode ray tube crt allowing us to observe the shape of the signal and measure the. Hacked crt tv becomes a crude oscilloscope youtube.
Looking at the face of the instrument, you are viewing the screen. The triggering circuit allows the oscilloscope to draw repeatedly the same waveform over and over by identifying the same point on a repetitive waveform. See lesson 1 describes a portion of a cathode ray tube crt. The screen glows at the point where the electron beam strikes. The oscilloscope oscilloscope operation x vs y mode an oscilloscope can be used to measure voltage. Hi, hope you young pups can teach an old dog new tricks i have a motorola same as r2001d or r2008d communications systems analyzer commonly known as a service monitor while still usable in the shop, the crt is getting dim.
It does this by measuring the voltage drop across a resistor and in the process draws a small current. I will show you how i converted an old crt tv into a crude oscilloscope. The monitor in question is a combined colour tv, radio and cassette player that i hope to rip the innards out of and turn into a nice oscilloscope. Learn how with this video tutorial, which offers stepbystep instructions on setting up and adjusting an old cathode ray tube oscilloscope for the measurment of signals. The oscilloscope is rugged, easy to operate and highly reliable. Pdf oscilloscope and its applications researchgate. Introduction to the oscilloscope purdue university.
Hi, i just joined the eevblog after having watched many of daves videos sporadically over the last few months. Oscilloscope fundamentals case school of engineering. The cathoderay tube crt is a vacuum tube that contains one or more electron guns and a phosphorescent screen and is used to display images. These crts are proprietary, were available only from motorola at great cost, and were evidently only manufactured by either telefunken or magnavox, and. The electron beam is produced by an assembly called an electron gun located in the neck of the tube. Howard, wanted to send you a few pictures of the evolving project.
Whats more, the plan is available as a pdf file so that you can print it and consult with it during the assembly process. The triggering circuit allows the oscilloscope to draw repeatedly the same waveform over and over by identifying the same point on a. Ive decided to start electronics as a hobby and i really enjoyed daves post about what is needed to build a good starter lab. The cathode ray tube example 7 on an accelerated electron see lesson 1 describes a portion of a cathode ray tube crt. An introduction to using the agilent 54622d digital.