FACTOID # 2: Puerto Rico has roughly the same gross state product as Montana, Wyoming and North Dakota combined.
 
 Home   Encyclopedia   Statistics   States A-Z   Flags   Maps   FAQ   About 
   
 
WHAT'S NEW
RELATED ARTICLES
People who viewed "Oscilloscope" also viewed:
 

SEARCH ALL

FACTS & STATISTICS    Advanced view

Search encyclopedia, statistics and forums:

 

 

(* = Graphable)

 

 


Encyclopedia > Oscilloscope
Illustration showing the interior of a cathode-ray tube for use in an oscilloscope. Numbers in the picture indicate: 1. Deflection voltage electrode; 2. Electron gun; 3. Electron beam; 4. Focusing coil; 5. Phosphor-coated inner side of the screen.
Illustration showing the interior of a cathode-ray tube for use in an oscilloscope. Numbers in the picture indicate: 1. Deflection voltage electrode; 2. Electron gun; 3. Electron beam; 4. Focusing coil; 5. Phosphor-coated inner side of the screen.
The Agilent InfiniiVision 7000 Series is a digital storage oscilloscope which can capture and analyze analog and digital signals. The 7000 Series oscilloscope has 2 or 4 analog, plus 16 digital channels. It has a bandwidth of 350MHz,500 MHz, or 1GHz.
The Agilent InfiniiVision 7000 Series is a digital storage oscilloscope which can capture and analyze analog and digital signals. The 7000 Series oscilloscope has 2 or 4 analog, plus 16 digital channels. It has a bandwidth of 350MHz,500 MHz, or 1GHz.
A Tektronix model 475A portable analogue oscilloscope, a very typical instrument of the late 1970s. This dual-trace, dual-sweep instrument had a horizontal bandwidth of 250 MHz, a maximum vertical sensitivity of 5 mV per division, and maximum (unmagnified) horizontal sweep speed of 10 ns per division. The vertical controls are on the left with Channel 1 above and Channel 2 below. The horizontal sweep controls are on the right with the Main Trigger above and the Delayed Trigger below. The CRT controls are below the screen. The metal loop to the lower right of the screen provided a calibration signal for voltage and current probes.
A Tektronix model 475A portable analogue oscilloscope, a very typical instrument of the late 1970s. This dual-trace, dual-sweep instrument had a horizontal bandwidth of 250 MHz, a maximum vertical sensitivity of 5 mV per division, and maximum (unmagnified) horizontal sweep speed of 10 ns per division. The vertical controls are on the left with Channel 1 above and Channel 2 below. The horizontal sweep controls are on the right with the Main Trigger above and the Delayed Trigger below. The CRT controls are below the screen. The metal loop to the lower right of the screen provided a calibration signal for voltage and current probes.


An oscilloscope (sometimes abbreviated CRO, for cathode-ray oscilloscope, or commonly just scope or O-scope) is a type of electronic test equipment that allows signal voltages to be viewed, usually as a two-dimensional graph of one or more electrical potential differences (vertical axis) plotted as a function of time or of some other voltage (horizontal axis). Image File history File links CRT_oscilloscope. ... Image File history File links CRT_oscilloscope. ... ... Bandwidth is the difference between the upper and lower cutoff frequencies of, for example, a filter, a communication channel, or a signal spectrum, and is typically measured in hertz. ... MegaHertz (MHz) is the name given to one million (106) Hertz, a measure of frequency. ... MegaHertz (MHz) is the name given to one million (106) Hertz, a measure of frequency. ... Image File history File links Oscilloscope. ... Image File history File links Oscilloscope. ... Tektronix is a United States corporation that is currently a major presence in the test, measurement, and measuring industry. ... The 1970s decade refers to the years from 1970 to 1979, also called The Seventies. ... MegaHertz (MHz) is the name given to one million (106) Hertz, a measure of frequency. ... Josephson junction array chip developed by NIST as a standard volt. ... To help compare orders of magnitude of different times this page lists times between 10−9 seconds and 10−8 seconds (1 nanosecond and 10 nanoseconds) See also times of other orders of magnitude. ... Cathode ray tube employing electromagnetic focus and deflection Cutaway rendering of a color CRT: 1. ... A test probe (test lead, test prod) is a physical device used to connect electronic test equipment to the device under test (DUT). ... A schematic diagram of a Crookes tube apparatus. ... Back to Electronics A Tektronix model 475A portable analogue oscilloscope Electronic test equipment (sometimes called testgear) is used to create stimulus signals and capture responses from electronic Devices Under Test (DUTs). ... International safety symbol Caution, risk of electric shock (ISO 3864), colloquially known as high voltage symbol. ... Potential difference is a quantity in physics related to the amount of energy that would be required to move an object from one place to another against various types of force. ...

Contents

Features and uses

Image File history File links Oscilloscope_diagram. ... Image File history File links Oscilloscope_diagram. ...

Description

Exterior

A typical oscilloscope is a box with a display screen, numerous input connectors, and control knobs and buttons on the front panel. To aid measurement, a grid called the graticule is drawn on the face of the screen. Each square in the graticule is known as a division.


Inputs

The signal to be measured is fed to one of the input connectors, which is usually a coaxial connector such as a BNC or N type. If the signal source has its own coaxial connector, then a simple coaxial cable is used; otherwise, a specialised cable called a 'scope probe', supplied with the oscilloscope, is used. General-purpose oscilloscopes have a standardised input resistance of 1 megaohm in parallel with a capacitance of around 20 picofarads. This allows the use of standard oscilloscope probes. Scopes for use with very high frequencies may have 50-ohm inputs, which must be either connected directly to a 50-ohm signal source or used with Z0 or active probes. It is used for measuring voltage. Male BNC connector Cables with BNC connectors Adapter between a female BNC connector and banana plugs Picture to show the similarity between 50 Ω and 75 Ω BNC connectors Pulse generators with BNC connectors and cables. ... Type N connector (male) Type N connector (female) Picture to show the similarity between 50ohm and 75ohm N connectors The N connector (in full, Type N connector) is a threaded RF connector used to join coaxial cables. ... Coaxial Cable For the weapon, see coaxial weapon. ... A test probe (test lead, test prod) is a physical device used to connect electronic test equipment to the device under test (DUT). ... A multimeter can be used to measure resistance in ohms. ...


The trace

In its simplest mode, the oscilloscope repeatedly draws a horizontal line called the trace across the middle of the screen from left to right. One of the controls, the timebase control, sets the speed at which the line is drawn, and is calibrated in seconds per division. If the input voltage departs from zero, the trace is deflected either upwards or downwards. Another control, the vertical control, sets the scale of the vertical deflection, and is calibrated in volts per division. The resulting trace is a plot of voltage against time, with the more distant past on the left and the more recent past on the right. This article is about the unit of time. ... Josephson junction array chip developed by NIST as a standard volt. ...


If the input signal is periodic, then a nearly stable trace can be obtained just by setting the timebase to match the frequency of the input signal. For example, if the input signal is a 50 Hz sine wave, then its period is 20 ms, so the timebase should be adjusted so that the time between successive horizontal sweeps is 20 ms. This mode is called continual sweep. Since the calibrated oscilloscope timebase may not exactly match the period of the input signal, the trace will drift across the screen making measurements difficult. If the time base is adjusted to stabilize the trace, the time per hoirzontal division is altered, and usually uncalibrated. For other uses, see Frequency (disambiguation). ... This article is about the SI unit of frequency. ... In mathematics, the trigonometric functions are functions of an angle, important when studying triangles and modeling periodic phenomena. ...


Trigger

An old Tektronix oscilloscope.
An old Tektronix oscilloscope.

To provide a more stable trace, modern oscilloscopes have a function called the trigger. When using triggering, the scope will pause each time the sweep reaches the extreme right side of the screen. The scope then waits for a specified event before drawing the next trace. The trigger event is usually the input waveform reaching some user-specified threshold voltage in the specified direction (going positive or going negative). Tektronix is a United States corporation that is currently a major presence in the test, measurement, and measuring industry. ...


The effect is to resynchronize the timebase to the input signal, preventing horizontal drift of the trace. In this way, triggering allows the display of periodic signals such as sine waves and square waves. Trigger circuits also allow the display of nonperiodic signals such as single pulses or pulses that don't recur at a fixed rate.


Types of trigger include:

  • external trigger, a pulse from an external source connected to a dedicated input on the scope.
  • edge trigger, an edge-detector that generates a pulse when the input signal crosses a specified threshold voltage in a specified direction.
  • video trigger, a circuit that extracts synchronizing pulses from video formats such as PAL and NTSC and triggers the timebase on every line, a specified line, every field, or every frame. This circuit is typically found in a waveform monitor device.
  • delayed trigger, which waits a specified time after an edge trigger before starting the sweep. No trigger circuit acts instantaneously, so there is always a certain delay, but a trigger delay circuit extends this delay to a known and adjustable interval. In this way, the operator can examine a particular pulse in a long train of pulses.

For other uses, see Video (disambiguation). ... For other uses, see PAL (disambiguation). ... NTSC is the analog television system in use in the United States, Canada, Japan, Mexico, the Philippines, South Korea, Taiwan, and some other countries (see map). ... Waveform monitor in 2-line mode, showing color bars. ...

X-Y mode

Most modern oscilloscopes have several inputs for voltages, and thus can be used to plot one varying voltage versus another. This is especially useful for graphing I-V curves (current versus voltage characteristics) for components such as diodes, as well as Lissajous patterns. Lissajous figures are an example of how an oscilloscope can be used to track phase differences between multiple input signals. This is very frequently used in broadcast engineering to plot the left and right stereophonic channels, to ensure that the stereo generator is calibrated properly. This box:      Electric current is the flow (movement) of electric charge. ... International safety symbol Caution, risk of electric shock (ISO 3864), colloquially known as high voltage symbol. ... Closeup of the image below, showing the square shaped semiconductor crystal various semiconductor diodes, below a bridge rectifier Structure of a vacuum tube diode In electronics, a diode is a two-terminal component, almost always one that has electrical properties which vary depending on the direction of flow of charge... Lissajous figure on an oscilloscope- the shape of the ABC logo Lissajous figure in three dimensions In mathematics, a Lissajous curve (Lissajous figure or Bowditch curve) is the graph of the system of parametric equations which describes complex harmonic motion. ... This article is about a portion of a periodic process. ... Broadcast engineering is the field of electrical engineering, and now to some extent radio and television broadcasting. ... Stereophonic means having two channels of audio. ... A stereo generator is an electronic device designed to encode stereophonic information for transmission over radio or television. ... Calibration is the determination, by measurement or comparison with a standard, of the correct value of each reading on a measuring instrument. ...


Other features

Some oscilloscopes have cursors, which are lines that can be moved about the screen to measure the time interval between two points, or the difference between two voltages.


Oscilloscopes may have two or more input channels, allowing them to display more than one input signal on the screen. Usually the oscilloscope has a separate set of vertical controls for each channel, but only one triggering system and timebase.


Sometimes the event that the user wants to see may only happen occasionally. To catch these events, some oscilloscopes, known as "storage scopes", preserve the most recent sweep on the screen. This was originally achieved by using a special CRT, a "storage tube", which would retain the image of even a very brief event for a long time. Mostly obsolete, a storage tube is a special monochromatic CRT whose screen has a kind of memory (hence the name): when a portion of the screen is illuminated by the CRTs electron gun, it stays lit until a screen erase command is given. ...


Some digital oscilloscopes can sweep at speeds as slow as once per hour, emulating a strip chart recorder. That is, the signal scrolls across the screen from right to left. Most oscilloscopes with this facility switch from a sweep to a strip-chart mode at about one sweep per ten seconds. This is because otherwise, the scope looks broken: it's collecting data, but the dot cannot be seen.


Oscilloscopes were originally analog devices. In more recent times digital signal sampling is more often used for all but the simplest models.


Many oscilloscopes have different plug-in modules for different purposes, e.g., high-sensitivity amplifiers of relatively narrow bandwidth, differential amplifiers, amplifiers with 4 or more channels, sampling plugins for repetitive signals of very high frequency, and special-purpose plugins.


Examples of use

Lissajous figures on an oscilloscope, with 90 degrees phase difference between x and y inputs.
Lissajous figures on an oscilloscope, with 90 degrees phase difference between x and y inputs.

One of the most frequent uses of scopes is troubleshooting malfunctioning electronic equipment. One of the advantages of a scope is that it can graphically show signals: where a voltmeter may show a totally unexpected voltage, a scope may reveal that the circuit is oscillating. In other cases the precise shape of a pulse is important. Image File history File links Lissajous_figures_on_oscilloscope_(90_degrees_phase_shift). ... Image File history File links Lissajous_figures_on_oscilloscope_(90_degrees_phase_shift). ... Lissajous figure on an oscilloscope- the shape of the ABC logo Lissajous figure in three dimensions In mathematics, a Lissajous curve (Lissajous figure or Bowditch curve) is the graph of the system of parametric equations which describes complex harmonic motion. ... Troubleshooting is a form of problem solving. ... Two digital voltmeters. ...


In a piece of electronic equipment, for example, the connections between stages (e.g. electronic mixers, electronic oscillators, amplifiers) may be 'probed' for the expected signal, using the scope as a simple signal tracer. If the expected signal is absent or incorrect, some preceding stage of the electronics is not operating correctly. Since most failures occur because of a single faulty component, each measurement can prove that half of the stages of a complex piece of equipment either work, or probably did not cause the fault. An electronic mixer is a device for mixing two or more electronic signals. ... Cross coupled LC oscillator with output on top An electronic oscillator is an electronic circuit that produces a repetitive electronic signal, often a sine wave or a square wave. ... For the British rock band of the same name, see Amplifier (band). ...


Once the faulty stage is found, further probing can usually tell a skilled technician exactly which component has failed. Once the component is replaced, the unit can be restored to service, or at least the next fault can be isolated.


Another use is to check newly designed circuitry. Very often a newly designed circuit will misbehave because of design errors, bad voltage levels, electrical noise etc. Digital electronics usually operate from a clock, so a dual-trace scope which shows both the clock signal and a test signal dependent upon the clock is useful. "Storage scopes" are helpful for "capturing" rare electronic events that cause defective operation.


Another use is for software engineers who must program electronics. Often a scope is the only way to see if the software is running the electronics properly.

Pictures of Use

Selection

Oscilloscopes generally have a checklist of some set of the above features. The basic measure of virtue is the bandwidth of its vertical amplifiers. Typical scopes for general purpose use should have a bandwidth of at least 100 MHz, although much lower bandwidths are acceptable for audio-frequency applications. A useful sweep range is from one second to 100 nanoseconds, with triggering and delayed sweep. Bandwidth is the difference between the upper and lower cutoff frequencies of, for example, a filter, a communication channel, or a signal spectrum, and is typically measured in hertz. ...


The chief benefit of a quality oscilloscope is the quality of the trigger circuit. If the trigger is unstable, the display will always be fuzzy. The quality improves roughly as the frequency response and voltage stability of the trigger increase.


Analog oscilloscopes have been almost totally displaced by digital storage scopes except for the low bandwidth (< 60 MHz) segment of the market. Greatly increased sample rates have eliminated the display of incorrect signals, known as "aliasing", that was sometimes present in the first generation of digital scopes. The used test equipment market, particularly on-line auction venues, typically have a wide selection of older analog scopes available. However it is becoming more difficult to obtain replacement parts for these instruments and repair services are generally unavailable from the original manufacturer.


As of 2007, a 350 MHz bandwidth (BW), 2.5 giga-samples per second (GS/s), dual-channel digital storage scope costs about US$7000 new. The current real-time analog bandwidth record, as of February 2007, is held by the Tektronix DPO70000 and DSA70000 oscilloscope families with a 20 GHz BW (non-interleaved) and a sample rate of 50 GHz. The current equivalent time sampling bandwidth record for sampling digital storage oscilloscopes, as of June 2006, is held by the LeCroy WaveExpert series with a 100 GHz bandwidth.


Software

Many oscilloscopes today provide one or more external interfaces to allow remote instrument control by external software. These interfaces (or buses) include GPIB, Ethernet, serial port, and USB. Instrument control consists of connecting a desktop instrument to a computer and taking measurements. ... The Hewlett-Packard Instrument Bus (HP-IB), is a short-range digital communications cable standard developed by Hewlett-Packard (HP) in the 1970s for connecting electronic test and measurement devices (e. ... Ethernet is a large, diverse family of frame-based computer networking technologies that operate at many speeds for local area networks (LANs). ... A male DE-9 connector used for a serial port on a PC style computer. ... Note: USB may also mean upper sideband in radio. ...


How it works

Cathode-ray oscilloscope (CRO)

The earliest and simplest type of oscilloscope consisted of a cathode ray tube, a vertical amplifier, a timebase, a horizontal amplifier and a power supply. These are now called 'analogue' scopes to distinguish them from the 'digital' scopes that became common in the 1990s and 2000s. Cathode ray tube employing electromagnetic focus and deflection Cutaway rendering of a color CRT: 1. ... For the British rock band of the same name, see Amplifier (band). ... An electronic power supply, often referred to somewhat incorrectly as an AC adaptor, is an electronic device that produces direct current of a particular voltage and current from a source of electricity such as a battery or wall-socket power. ...


Before the introduction of the CRO in its current form, the cathode ray tube had already been in use as a measuring device. The cathode ray tube is an evacuated glass envelope, similar to that in a black-and-white television set, with its flat face covered in a phosphorescent material (the phosphor). The screen is typically less than 20 cm in diameter, much smaller than the one in a television set. Cathode ray tube employing electromagnetic focus and deflection Cutaway rendering of a color CRT: 1. ... Green screen A phosphor is a substance that exhibits the phenomenon of phosphorescence (sustained glowing after exposure to light or energised particles such as electrons). ...


In the neck of the tube is an electron gun, which is a heated metal plate with a wire mesh (the grid) in front of it. A small grid potential is used to block electrons from being accelerated when the electron beam needs to be turned off, as during sweep retrace or when no trigger events occur. A potential difference of at least several hundred volts is applied to make the heated plate (the cathode) negatively charged relative to the deflection plates. For higher bandwidth oscilloscopes where the trace may move more rapidly across the phosphor target, a positive post-deflection acceleration voltage of over 10,000 volts is often used, increasing the energy (speed) of the electrons that strike the phosphor. The kinetic energy of the electrons is converted by the phosphor into visible light at the point of impact. When switched on, a CRT normally displays a single bright dot in the center of the screen, but the dot can be moved about electrostatically or magnetically. The CRT in an oscilloscope uses electrostatic deflection. Potential difference is a quantity in physics related to the amount of energy that would be required to move an object from one place to another against various types of force. ...

Between the electron gun and the screen are two opposed pairs of metal plates called the deflection plates. The vertical amplifier generates a potential difference across one pair of plates, giving rise to a vertical electric field through which the electron beam passes. When the plate potentials are the same, the beam is not deflected. Image File history File links No higher resolution available. ... Image File history File links No higher resolution available. ... Potential difference is a quantity in physics related to the amount of energy that would be required to move an object from one place to another against various types of force. ... In physics, the space surrounding an electric charge or in the presence of a time-varying magnetic field has a property called an electric field. ...


When the top plate is positive with respect to the bottom plate, the beam is deflected upwards; when the field is reversed, the beam is deflected downwards. The horizontal amplifier does a similar job with the other pair of deflection plates, causing the beam to move left or right. This deflection system is called electrostatic deflection, and is different from the electromagnetic deflection system used in television tubes. In comparison to magnetic deflection, electrostatic deflection can more readily follow random changes in potential, but is limited to small deflection angles.


The timebase is an electronic circuit that generates a ramp voltage. This is a voltage that changes continuously and linearly with time. When it reaches a predefined value the ramp is reset, with the voltage reestablishing its initial value. When a trigger event is recognized the reset is released, allowing the ramp to increase again. The timebase voltage usually drives the horizontal amplifier. Its effect is to sweep the electron beam at constant speed from left to right across the screen, then quickly return the beam to the left in time to begin the next sweep. The timebase can be adjusted to match the sweep time to the period of the signal. An electronic circuit is an electrical circuit that also contains active electronic devices such as transistors or vacuum tubes. ...


Meanwhile, the vertical amplifier is driven by an external voltage (the vertical input) that is taken from the circuit or experiment that is being measured. The amplifier has a very high input impedance, typically one megohm, so that it draws only a tiny current from the signal source. The amplifier drives the vertical deflection plates with a voltage that is proportional to the vertical input. Because the electrons have already been accelerated by hundreds of volt, this amplifier also has to deliver almost hundred volts, and this with a very high bandwidth. The gain of the vertical amplifier can be adjusted to suit the amplitude of the input voltage. A positive input voltage bends the electron beam upwards, and a negative voltage bends it downwards, so that the vertical deflection of the dot shows the value of the input. The response of this system is much faster than that of mechanical measuring devices such as the multimeter, where the inertia of the pointer slows down its response to the input. The input impedance or sometimes loading impedance of a circuit or electronic device is the impedance actually experienced by a signal which is connected to its input. ... In electronics, gain is usually taken as the mean ratio of the signal output of a system to the signal input of the system. ... A digital multimeter A low cost digital multimeter An analog benchtop multimeter A multimeter or a multitester is an electronic measuring instrument that combines several functions in one unit. ... This article is about inertia as it applies to local motion. ...


When all these components work together, the result is a bright trace on the screen that represents a graph of voltage against time. Voltage is on the vertical axis, and time on the horizontal.


Observing high speed signals, especially non-repetitive signals, with a conventional CRO is difficult, due to non-stable or changing triggering threshold which makes it hard to "freeze" the waveform on the screen. This often requires the room to be darkened or a special viewing hood to be placed over the face of the display tube. To aid in viewing such signals, special oscilloscopes have borrowed from night vision technology, employing a microchannel plate in the tube face to amplify faint light signals. This article does not cite any references or sources. ...

Tektronix Model C-5A Oscilloscope Camera with Polaroid instant film pack back.
Tektronix Model C-5A Oscilloscope Camera with Polaroid instant film pack back.

Although a CRO allows one to view a signal, in its basic form it has no means of recording that signal on paper for the purpose of documentation. Therefore, special oscilloscope cameras were developed to photograph the screen directly. Early cameras used roll or plate film, while in the 1970s Polaroid instant cameras became popular. Image File history File links Tektronix® Model C-5A oscilloscope camera with Polaroid® instant film pack back. ... Image File history File links Tektronix® Model C-5A oscilloscope camera with Polaroid® instant film pack back. ... Tektronix is a United States corporation that is currently a major presence in the test, measurement, and measuring industry. ... Polaroid is the name of a type of synthetic plastic sheet which is used to polarise light. ... A camera is a device used to take images (usually photographs), either singly or in sequence, with or without sound, such as with video cameras. ... The 1970s decade refers to the years from 1970 to 1979, also called The Seventies. ... A Polaroid camera is a type of camera with self-developing film usually called an instant camera. The invention of modern instant cameras is generally credited to American scientist Edwin Land, who unveiled the first commercial instant camera, the Land Camera, in 1947, 10 years after founding the Polaroid Corporation. ...


The vertical amplifier and timebase controls are calibrated to show the vertical distance on the screen that corresponds to a given voltage difference, and the horizontal distance that corresponds to a given time interval.


The power supply is an important component of the scope. It provides low voltages to power the cathode heater in the tube, and the vertical and horizontal amplifiers. High voltages are needed to drive the electrostatic deflection plates. These voltages must be very stable. Any variations will cause errors in the position and brightness of the trace.


Later analogue oscilloscopes added digital processing to the standard design. The same basic architecture - cathode ray tube, vertical and horizontal amplifiers - was retained, but the electron beam was controlled by digital circuitry that could display graphics and text mixed with the analogue waveforms. The extra features that this system provides include:

  • on-screen display of amplifier and timebase settings;
  • voltage cursors - adjustable horizontal lines with voltage display;
  • time cursors - adjustable vertical lines with time display;
  • on-screen menus for trigger settings and other functions.

Dual beam oscilloscope

A dual beam oscilloscope was a type of oscilloscope once used to compare one signal with another. There were two beams produced in a special type of CRT. Unlike an ordinary "dual-trace" oscilloscope (which time-shared a single electron beam, thus losing about 50% of each signal), a dual beam oscilloscope simultaneously produced two separate electron beams, capturing the entirety of both signals. Cathode ray tube employing electromagnetic focus and deflection Cutaway rendering of a color CRT: 1. ...


Two pairs of vertical plates deflected the beams. Vertical plates for channel A had no effect on channel B beam. Similarly for channel B, separate vertical plates existed which deflected the beam B only.


On some scopes the time base, horizontal plates and horizontal amplifier were common to both beams; on more elaborate scopes like the Tektronix 556 there were two independent time bases and two sets of horizontal plates and horizontal amplifiers. Thus one could look at a very fast signal on one beam and a slow signal on another beam. Tektronix is a United States corporation that is currently a major presence in the test, measurement, and measuring industry. ...


Most multichannel 'scopes do not actually have multiple electron beams. Instead, they display only one dot at a time, but switch the dot between one channel and the other either on alternate sweeps (ALT mode) or many times per sweep (CHOP mode). Very few actual dual beam oscilloscopes were built.


With the advent of digital signal capture, true dual beam oscilloscopes became obsolete, as it was then possible to display two truly simultaneous signals from memory using either the ALT or CHOP display technique, or even possibly a raster display mode.


Analogue storage oscilloscope

An extra feature available on some analogue scopes is called 'storage'. This feature allows the trace pattern that normally decays in a fraction of a second to remain on the screen for several minutes or longer. An electrical circuit can then be deliberately activated to store and erase the trace on the screen.


The storage is accomplished using the principle of secondary emission. When the ordinary writing electron beam passes a point on the phosphor surface, not only does it momentarily cause the phosphor to illuminate, but the kinetic energy of the electron beam knocks other electrons loose from the phosphor surface. This can leave a net positive charge. Storage oscilloscopes then provide one or more secondary electron guns (called the "flood guns") that provide a steady flood of low-energy electrons traveling towards the phosphor screen. The electrons from the flood guns are more strongly drawn to the areas of the phosphor screen where the writing gun has left a net positive charge; in this way, the electrons from the flood guns re-illuminate the phosphor in these positively-charged areas of the phosphor screen. Secondary emission is a phenomenon that occurs in electron tubes where electrons impact an electrode with sufficient energy to knock additional electrons from the surface of that electrode. ...


If the energy of the flood gun electrons is properly balanced, each impinging flood gun electron knocks out one secondary electron from the phosphor screen, thus preserving the net positive charge in the illuminated areas of the phosphor screen. In this way, the image originally written by the writing gun can be maintained for a long time. Eventually, small imbalances in the secondary emission ratio cause the entire screen to "fade positive" (light up) or cause the originally-written trace to "fade negative" (extinguish). It is these imbalances that limit the ultimate storage time possible.


Some oscilloscopes used a strictly binary (on/off) form of storage known as "bistable storage". Others permitted a constant series of short, incomplete erasure cycles which created the impression of a phosphor with "variable persistence". Certain oscilloscopes also allowed the partial or complete shutdown of the flood guns, allowing the preservation (albeit invisibly) of the latent stored image for later viewing. (Fading positive or fading negative only occurs when the flood guns are "on"; with the flood guns off, only leakage of the charges on the phosphor screen degrades the stored image.) Binary is quite hard The binary numeral system, or base-2 number system, is a numeral system that represents numeric values using two symbols, usually 0 and 1. ...


Digital storage oscilloscope

A digital storage oscilloscope manufactured by Agilent Technologies

The digital storage oscilloscope, or DSO for short, is now the preferred type for most industrial applications, although simple analogue CROs are still used by hobbyists. It replaces the unreliable storage method used in analogue storage scopes with digital memory, which can store data as long as required without degradation. It also allows complex processing of the signal by high-speed digital signal processing circuits. Image File history File links Size of this preview: 800 × 533 pixel Image in higher resolution (1500 × 1000 pixel, file size: 126 KB, MIME type: image/jpeg) Agilent Technologies, www. ... Image File history File links Size of this preview: 800 × 533 pixel Image in higher resolution (1500 × 1000 pixel, file size: 126 KB, MIME type: image/jpeg) Agilent Technologies, www. ... Agilent Technologies (NYSE: A) (Agilent for short) is a measurement and instrument company headquartered in Santa Clara, California. ... The terms storage (U.K.) or memory (U.S.) refer to the parts of a digital computer that retain physical state (data) for some interval of time, possibly even after electrical power to the computer is turned off. ... Digital signal processing (DSP) is the study of signals in a digital representation and the processing methods of these signals. ...


The vertical input, instead of driving the vertical amplifier, is digitised by an analog to digital converter to create a data set that is stored in the memory of a microprocessor. The data set is processed and then sent to the display, which in early DSOs was a cathode ray tube, but is now more likely to be an LCD flat panel. DSOs with color LCD displays are common. The data set can be sent over a LAN or a WAN for processing or archiving. The screen image can be directly recorded on paper by means of an attached printer or plotter, without the need for an oscilloscope camera. The scope's own signal analysis software can extract many useful time-domain features (e.g. rise time, pulse width, amplitude), frequency spectra, histograms and statistics, persistence maps, and a large number of parameters meaningful to engineers in specialized fields such as telecommunications, disk drive analysis and power electronics. This article or section should include material from AD converters In electronics, an analog-to-digital converter (abbreviated ADC, A/D, or A to D) is a device that converts continuous signals to discrete digital numbers. ... A microprocessor incorporates most or all of the functions of a central processing unit (CPU) on a single integrated circuit (IC). ... LCD redirects here. ... Lan can stand for several things: A local area network Lan (airline) formerly LanChile Lan Peru Län, a kind of administrative division used in Sweden Lan Mandragoran, a fictional character in the Wheel of Time fantasy series by Robert Jordan. ... Wide Area Network (WAN) is a computer network that covers a broad area (i. ...


Digital oscilloscopes are limited principally by the performance of the analogue input circuitry and the sampling frequency. In general, the sampling frequency should be at least the Nyquist rate, double the frequency of the highest-frequency component of the observed signal, otherwise aliasing may occur. The sampling frequency or sampling rate defines the number of samples per second taken from a continuous signal to make a discrete signal. ... Properly sampled image of brick wall. ...


Digital storage also makes possible another unique type of oscilloscope, the equivalent-time sample scope. Instead of taking consecutive samples after the trigger event, only one sample is taken. However, the oscilloscope is able to vary its timebase to precisely time its sample, thus building up the picture of the signal over the subsequent repeats of the signal. This requires that either a clock or repeating pattern be provided. This type of scope is frequently used for very high speed communication because it allows for a very high "sample rate" and low amplitude noise compared to traditional real-time scopes.


To sum this up: Advantages over the analogue oscilloscope:

  • Brighter and bigger display with color to distinguish multiple traces
  • Equivalent time sampling and Average across consecutive samples or scans lead to higher resolution down to µV
  • Peak detection
  • Pre-trigger
  • Easy pan and zoom across multiple stored traces allows beginners to work without a trigger
    • This needs a fast reaction of the display (some scopes have 1 s delay)
    • The knobs have to be large and turn smoothly
  • Also slow traces like the temperature variation across a day can be recorded
  • The memory of the oscilloscope can be arranged not only as a one-dimensional list but also as a two-dimensional array to simulate a phosphorus screen. The digital technique allows a quantitative analysis (E.g. Eye diagram)
  • Allows for automation, though most models lock the access to their software

A disadvantage of digital oscilloscopes is the limited refresh rate of the screen. On an analog oscilloscope, the user can get an intuitive sense of the trigger rate simply by looking at the steadiness of the CRT trace. For a digital oscilloscope, the screen looks exactly the same for any signal rate which exceeds the screen's refresh rate. Additionally, it is sometimes hard to spot "glitches" or other rare phenomena on the black-and-white screens of standard digital oscilloscopes; the slight persistence of CRT phosphors on analog scopes makes glitches visible even if many subsequent triggers overwrite them. Both of these difficulties have been overcome recently by "digital phosphor oscilloscopes," which store data at a very high refresh rate and display it with variable intensity, to simulate the trace persistence of a CRT scope. eye diagram of a 4 level signal In telecommunication, an eye pattern is an oscilloscope display in which a digital data signal from a receiver is repetitively sampled and applied to the vertical input, while the data rate is used to trigger the horizontal sweep. ...


Mixed signal oscilloscope

A mixed signal oscilloscope (or MSO) has two kinds of inputs, a small number (typically two or four) of analog channels, and a larger number (typically sixteen) of digital channels. These measurements are acquired with a single time base, they are viewed on a single display, and any combination of these signals can be used to trigger the oscilloscope.


An MSO combines all the measurement capabilities and the use model of a Digital Storage Oscilloscope (DSO) with some of the measurement capabilities of a logic analyzer. MSOs typically lack the advanced digital measurement capabilities and the large number of digital acquisition channels of full-fledged logic analyzers, but they are also much less complex to use. Typical mixed-signal measurement uses include the characterization and debugging of hybrid analog/digital circuits like: embedded systems, Analog-to-digital converters (ADCs), Digital-to-analog converters (DACs), and control systems. A logic analyzer displays signals in a digital circuit that are too fast to be observed by a human being and presents it to a user so that the user can more easily check correct operation of the digital system. ... A router, an example of an embedded system. ... 4-channel stereo multiplexed analog-to-digital converter WM8775SEDS made by Wolfson Microelectronics placed on X-Fi Fatal1ty Pro sound card An analog-to-digital converter (abbreviated ADC, A/D or A to D) is an electronic integrated circuit (i/c) that converts continuous signals to discrete digital numbers. ... 8-channel digital-to-analog converter Cirrus Logic CS4382 placed on Sound Blaster X-Fi Fatal1ty In electronics, a digital-to-analog converter (DAC or D-to-A) is a device for converting a digital (usually binary) code to an analog signal (current, voltage or electric charge). ... A control system is a device or set of devices to manage, command, direct or regulate the behaviour of other devices or systems. ...


Hand held oscilloscope

These are now available from several manufacturers in a variety of hand held oscilloscopes.


PC-based oscilloscope (PCO)

Oscilloscope software running in Windows that uses the computer's sound card as a cheap ADC
Oscilloscope software running in Windows that uses the computer's sound card as a cheap ADC

Although most people think of an oscilloscope as a self-contained instrument in a box, a new type of "oscilloscope" is emerging that consists of a specialized signal acquisition board (which can be an external USB or Parallel port device, or an internal add-on PCI or ISA card). The hardware itself usually consists of an electrical interface providing insulation and automatic gain controls, several hi-speed analogue-to-digital converters and some buffer memory, or even on-board DSPs. Depending on the exact hardware configuration, the hardware could be best described as a digitizer, a data logger or as a part of a specialized automatic control system. Image File history File links Download high resolution version (790x655, 33 KB)Screenshot of freeware oscilloscope software for Windows that uses the computers sound card as a cheap ADC, showing scope trace, FFT, and settings. ... Image File history File links Download high resolution version (790x655, 33 KB)Screenshot of freeware oscilloscope software for Windows that uses the computers sound card as a cheap ADC, showing scope trace, FFT, and settings. ... Windows redirects here. ... A sound card (also known as an audio card) is a computer expansion card that can input and output sound under control of computer programs. ... 4-channel stereo multiplexed analog-to-digital converter WM8775SEDS made by Wolfson Microelectronics placed on X-Fi Fatal1ty Pro sound card An analog-to-digital converter (abbreviated ADC, A/D or A to D) is an electronic integrated circuit (i/c) that converts continuous signals to discrete digital numbers. ... Note: USB may also mean upper sideband in radio. ... This article is about the Centronics style port. ... The three-letter abbreviation PCI may refer to: // Project Concern International A Humanitarian Organization Peripheral Component Interconnect — standard specifies a computer bus for attaching peripheral devices to a computer motherboard. ... This article does not cite any references or sources. ... A digital signal processor (DSP) is a specialized microprocessor designed specifically for digital signal processing, generally in real-time. ... In telecommunication and computing, the term digitizer has the following meanings: A device that converts an analog signal into a digital representation of the analog signal. ... A data logger (sometimes spelt Datalogger) is an electronic instrument (or specialised computing device in some cases) that records digital, analogue, frequency or smart protocol based measurements over time. ...


The PC provides the display, control interface, disc storage, networking and often the electrical power for the acquisition hardware. The viability of PC-based oscilloscopes depends on the current widespread use and low cost of standardized PCs. Since prices can range from as little as $100 to as much as $3000 depending on their capabilities, such instruments are particularly suitable for the educational market, where PCs are commonplace but equipment budgets are often low. The acquisition hardware, in certain cases, may only consist of a standard sound card or even a game port, if only audio and low frequency signals are involved. A stylised illustration of a personal computer A personal computer (PC) is a computer whose original sales price, size, and capabilities make it useful for individuals, intended to be operated directly by an end user, with no intervening computer operator. ... A sound card (also known as an audio card) is a computer expansion card that can input and output sound under control of computer programs. ... A PCI based soundcard with a DA-15 connector The game port is the traditional connection for video game input devices on an x86-based PCs. ...


The PCO can transfer data to the computer in two main ways - streaming, and block mode. In streaming mode the data is transfered to the PC in a continuous flow thus without any loss of data. The way in which the PCO is connected to the PC (e.g. USB) will dictate the maximum achievable speed using this method. Block mode utilizes the on-board memory of the PCO to collect a block of data which is then transfered to the PC after the block has been recorded. The PCO hardware then resets and records another block of data. This process happens very quickly however the time taken will vary according to the size of the block of data and the speed at which it can be transferred. This method enables a much higher sampling speed, however in many cases the hardware will not record data whilst it is transferring the existing block, meaning that some data loss will occur. Note: USB may also mean upper sideband in radio. ...


The advantages of PC-based oscilloscopes include:

  • Lower cost compared to a stand-alone oscilloscope, assuming the user already owns a PC. Professional-grade PCO hardware (e.g. with bandwidth in the MHz rather than in the kHz range) tends to be more expensive than e.g. a typical PCI sound card, and some can even cost more than a new PC [1].
  • Easy exporting of data to standard PC software such as spreadsheets and word processors.
  • Ability to control the instrument by running a custom program on the PC.
  • Use of the PC's networking and disc storage functions, which cost extra when added to a self-contained oscilloscope.
  • PCs typically have large high resolution color displays which can be easier to read. Color can be utilized to differentiate waveforms. It can also show increased information including more of the waveform or extras like automatic waveform measurements and simultaneous alternative views.
  • Portability when used with a laptop PC.

There are also some disadvantages, which include: A sound card (also known as an audio card) is a computer expansion card that can input and output sound under control of computer programs. ... Screenshot of a spreadsheet under OpenOffice A spreadsheet is a rectangular table (or grid) of information, often financial information. ... A word processor (also more formally known as a document preparation system) is a computer application used for the production (including composition, editing, formatting, and possibly printing) of any sort of viewable or printed material. ... A computer network is an interconnection of a group of computers. ... An ultraportable IBM X31 with 12 screen on an IBM T43 Thin & Light laptop with a 14 screen A laptop computer, or simply laptop (also notebook computer, notebook and notepad) is a small mobile computer, typically weighing 3-12 pounds (around 1. ...

  • Power-supply and electromagnetic noise from PC circuits requires careful and extensive shielding to obtain good low-level signal resolution.
  • Data transfer rates to the PC are dependent upon the connection method and this affects the maximum sampling speed achievable by the PCO when streaming.
  • Need for the owner to install oscilloscope software on the PC, which may not be compatible with the current release of the PC operating system.
  • Time for the PC to boot, compared with the almost instant start-up of a self-contained oscilloscope (although, as some modern oscilloscopes are actually PCs or similar machines in disguise, this distinction is narrowing).

As more processing power and data storage is included in oscilloscopes, the distinction is becoming blurred. Mainstream oscilloscope vendors manufacture large-screen, PC-based oscilloscopes, with very fast (multi-GHz) input digitizers and highly-customized human interfaces.


Software for a PC may use the sound card or game port to acquire analog signals, instead of dedicated signal acquistion hardware. However these devices have very restricted input voltage ranges, limited precision, and very restricted frequency ranges. The ground reference for these inputs is the same as the ground for the PC logic and power supply; this may inject unacceptable amounts of noise into the circuit under test. However, these devices can be useful for demonstration or hobby use. A sound card (also known as an audio card) is a computer expansion card that can input and output sound under control of computer programs. ... A PCI based soundcard with a DA-15 connector The game port is the traditional connection for video game input devices on an x86-based PCs. ...


If a sound card is used, frequency response is usually limited in the audio range. DC signals cannot be resolved. The number of inputs is limited by the number of recording channels and the inputs can handle only audio line-level voltages without the risk of damage. A sound card (also known as an audio card) is a computer expansion card that can input and output sound under control of computer programs. ... Line level is the strength of an audio signal used to transmit analog sound information between audio components such as CD and DVD players, TVs, amplifiers, and mixing consoles. ...


If the game port is used as the acquisition hardware, the sampling frequency is very low, typically below 1 kHz, and the input voltages can only vary over a range of a couple of volts. In addition, the game port cannot easily be programmed for a specific sampling rate, nor can it be easily assigned a precise quantization step. These limitations only make it suitable for low precision visualization of low frequency signals. A PCI based soundcard with a DA-15 connector The game port is the traditional connection for video game input devices on an x86-based PCs. ... A PCI based soundcard with a DA-15 connector The game port is the traditional connection for video game input devices on an x86-based PCs. ... Look up quantization in Wiktionary, the free dictionary. ...


History

Invention

Cathode ray tubes (CRTs) were developed in the late 19th century. At that time, the tubes were intended primarily to demonstrate and explore the physics of electrons (then known as cathode rays). Karl Ferdinand Braun invented the CRT oscilloscope as a physics curiosity in 1897, by applying an oscillating signal to electrically charged deflector plates in a phosphor-coated CRT. Applying a reference oscillating signal to the horizontal deflector plates and a test signal to the vertical deflector plates produced transient plots of electrical waveforms on the small phosphor screen. The first dual beam oscilloscope was developed in the late 1930s by the British company A.C.Cossor (later acquired by Raytheon). The CRT was not a true double beam type but used a split beam by placing a third plate between the vertical deflection plates. It was widely used during WWII for the development and servicing of radar equipment. Although extremely useful for examining the performance of pulse circuits it was not calibrated so could not be used as a measuring device. It was, however, useful in producing response curves of IF circuits and consequently a great aid in their accurate alignment. Cathode ray tube employing electromagnetic focus and deflection Cutaway rendering of a color CRT: 1. ... Properties The electron (also called negatron, commonly represented as e−) is a subatomic particle. ... A schematic diagram of a Crookes tube apparatus. ... Karl Ferdinand Braun (6 June 1850 in Fulda, Germany – 20 April 1918 in New York City, U.S.) was a German inventor, physicist and Nobel Prize laureate. ... Green screen A phosphor is a substance that exhibits the phenomenon of phosphorescence (sustained glowing after exposure to light or energised particles such as electrons). ... Waveform quite literally means the shape and form of a signal, such as a wave moving across the surface of water, or the vibration of a plucked string. ... A. C. Cossor Ltd. ... Raytheon Company (NYSE: RTN) is a major American defense contractor and industrial corporation with core manufacturing concentrations in defense systems and defense and commercial electronics. ... For other uses, see Radar (disambiguation). ...


The triggered oscilloscope

Oscilloscopes became a much more useful tool in 1946 when Howard Vollum and Jack Murdock invented the triggered oscilloscope, Tektronix Model 511. The first oscilloscopes used analog technology in which the electron beam traced on the oscilloscope's screen directly traced the input voltage's waveform. It would start a horizontal trace when the input voltage exceeded an adjustable threshold. Triggering allows stationary display of a repeating waveform, as multiple repetitions of the waveform are drawn over the exact same trace on the phosphor screen -- without triggering, multiple copies of the waveform are drawn in different places, giving an incoherent jumble or a moving image on the screen. Year 1946 (MCMXLVI) was a common year starting on Tuesday (link will display full 1946 calendar) of the Gregorian calendar. ... Howard Vollum, (1913-1986) an engineer, scientist, and philanthropist, was the co-founder of Tektronix Corporation, and endowed the Vollum Institute. ...


As oscilloscopes have become more powerful over time, enhanced triggering options allow capture and display of more complex waveforms. For example, trigger holdoff is a feature in most modern oscilloscopes that can be used to define a certain period following a trigger during which the oscilloscope will not trigger again. This makes it easier to establish a stable view of a waveform with multiple edges which would otherwise cause another trigger. Trigger holdoff is used in oscilloscopes to define a certain period following a trigger during which the scope will not trigger again. ...


Tektronix

Vollum and Murdock went on to found Tektronix, the first manufacturer of calibrated oscilloscopes (which included a graticule on the screen and produced plots with calibrated scales on the axes of the screen). Later developments by Tektronix included the development of multiple-trace oscilloscopes for comparing signals either by time-multiplexing (via chopping or trace alternation) or by the presence of multiple electron guns in the tube. In 1963, Tektronix introduced the Direct View Bistable Storage Tube (DVBST), which allowed observing single pulse waveforms rather than (as previously) only repeating wave forms. Using micro-channel plates, the most-advanced analogue oscilloscopes (for example, the Tek 7104 mainframe) could display a visible trace (or allow the photography) of a single-shot event even when running at extremely fast sweep speeds. Tektronix is a United States corporation that is currently a major presence in the test, measurement, and measuring industry. ... This article is about longitude and latitude; see also UTM coordinate system Map of Earth showing lines of latitude (horizontally) and longitude (vertically); large version (pdf) The geographic (earth-mapping) coordinate system expresses every horizontal position on Earth by two of the three coordinates of a spherical coordinate system which... Look up Axes in Wiktionary, the free dictionary. ... In telecommunications, multiplexing (also muxing or MUXing) is the combining of two or more information channels onto a common transmission medium using hardware called a multiplexer or (MUX). ... Electron gun from a cathode ray tube An electron gun is a component that produces an electron stream that has a precise kinetic energy, being used in all TVs and monitors which use cathode ray tube technology, and in other instruments, eg. ... DVBST was an acronym used by Tektronix to describe their line of Direct-View Bistable Storage Tubes. These were cathode ray tubes (CRTs) that stored information written to them using an analog technique inherent in the CRT and based upon the secondary emission of electrons from the phosphor screen itself. ... A micro-channel plate is a planar device which intensifies impinging radiation or particles by multiplication of electrons in small channels under the presence of a high electric field. ...


Digital oscilloscopes

The first Digital Storage Oscilloscopes (DSO) was invented by Walter LeCroy (who founded the LeCroy Corporation, based in New York, USA) after producing high-speed digitizers for the research center CERN in Switzerland. LeCroy remains one of the three largest manufacturers of oscilloscopes in the world. CERN logo The European Organization for Nuclear Research (French: ), commonly known as CERN (see Naming), pronounced (or in French), is the worlds largest particle physics laboratory, situated just northwest of Geneva on the border between France and Switzerland. ...


Starting in the 1980s, digital oscilloscopes became prevalent. Digital storage oscilloscopes use a fast analog-to-digital converter and memory chips to record and show a digital representation of a waveform, yielding much more flexibility for triggering, analysis, and display than is possible with a classic analog oscilloscope. Unlike its analog predecessor, the digital storage oscilloscope can show pre-trigger events, opening another dimension to the recording of rare or intermittent events and troubleshooting of electronic glitches. As of 2006 most new oscilloscopes (aside from education and a few niche markets) are digital. For other uses, see Digital (disambiguation). ... 4-channel stereo multiplexed analog-to-digital converter WM8775SEDS made by Wolfson Microelectronics placed on X-Fi Fatal1ty Pro sound card An analog-to-digital converter (abbreviated ADC, A/D or A to D) is an electronic integrated circuit (i/c) that converts continuous signals to discrete digital numbers. ... Troubleshooting is a form of problem solving. ... For other uses, see Glitch (disambiguation). ... Year 2006 (MMVI) was a common year starting on Sunday of the Gregorian calendar. ...


Digital scopes rely on effective use of the installed memory and trigger functions: not enough memory and the user will miss the events they want to examine; if the scope has a large memory but does not trigger as desired, the user will have difficulty finding the event.


Washing

During the years when oscilloscopes were built using vacuum tubes (valves) and, therefore, a great deal of high voltage electronics, it was a recommended service procedure to wash the interior circuits of one's oscilloscope. This was advised to prevent the build up of dust that may have caused low resistance and tracking paths from high voltage terminals. Tektronix published the recommended procedure in their company magazine TekScope. It involved a gentle, low-pressure application of water and dish detergent, followed by careful rinsing and drying of the instrument. In this way, the service technician could remove dust and other conductive contaminants that might otherwise impair the correct calibration of the instrument. The pre-servicing interior washing was continued long after semiconductor circuits had replaced tubes. Structure of a vacuum tube diode Structure of a vacuum tube triode In electronics, a vacuum tube, electron tube, or (outside North America) thermionic valve or just valve, is a device used to amplify, switch or modify a signal by controlling the movement of electrons in an evacuated space. ... Electrical resistance is a measure of the degree to which an electrical component opposes the passage of current. ... // Computer music Tracking is the art of creating tracking modules for the computer representation of music. ... Tektronix is a United States corporation that is currently a major presence in the test, measurement, and measuring industry. ...


Use as props

In the 1950s and 1960s, oscilloscopes were frequently used in movies and television programs to represent generic scientific and technical equipment, in much the same way that Jacob's ladders and Erlenmeyer flasks full of dry ice had been used by an earlier generation of filmmakers. The 1963–65 U.S. TV show The Outer Limits famously used an image of fluctuating Lissajous figures on an oscilloscope as the background to its opening credits ("There is nothing wrong with your television set....") while the movie Colossus: The Forbin Project prominently features a Tektronix RM503 rack-mounted oscilloscope. Oscilloscopes are also present in the popular TV series LOST, they are seen in the computer room in the Dharma Initiative station 3 - The Swan AKA The Hatch. The 1950s decade refers to the years of 1950 to 1959 inclusive. ... The 1960s decade refers to the years from the beginning of 1960 to the end of 1969. ... A spark plug. ... Conical flask For the episode of The X-Files, see The Erlenmeyer Flask. ... Dry ice pellet sublimating in water Dry ice block sublimating in air. ... The Outer Limits is an American television series. ... Lissajous figure on an oscilloscope- the shape of the ABC logo Lissajous figure in three dimensions In mathematics, a Lissajous curve (Lissajous figure or Bowditch curve) is the graph of the system of parametric equations which describes complex harmonic motion. ... Colossus was a fictional computer featured in the 1969 apocalyptic science fiction movie, Colossus: The Forbin Project loosely based on the 1967 novel Colossus by Dennis Feltham Jones. ... Look up lost in Wiktionary, the free dictionary. ... On the American television show Lost, the fictional DHARMA Initiative has built several research stations on an island located somewhere in the South Pacific. ...


See also

A test probe (test lead, test prod) is a physical device used to connect electronic test equipment to the device under test (DUT). ... In digital circuits, a runt pulse is a narrow pulse that, due to non-zero rise and fall times of the signal, does not reach a valid high or low level. ... For other uses, see Glitch (disambiguation). ... Tennis for Two was a game developed in 1958 on an oscilloscope which simulated a game of tennis or ping pong. ...

External links

  • Oscilloscope Tutorial
  • The Cathode Ray Tube site
  • Oscilloscope FAQ
  • Oscilloscope Waveform Measurements
  • Digital Storage Oscilloscope Measurement Basics
  • Oscilloscope Theory
  • Using an Oscilloscope

Image File history File links This is a lossless scalable vector image. ...


  Results from FactBites:
 
oscilloscope: Definition and Much More from Answers.com (6629 words)
An oscilloscope (sometimes abbreviated CRO, for cathode-ray oscilloscope, or commonly just scope) is a piece of electronic test equipment that allows signal voltages to be viewed, usually as a two-dimensional graph of one or more electrical potential differences (vertical axis) plotted as a function of time or of some other voltage (horizontal axis).
In the 1950s and 1960s, oscilloscopes were frequently used in movies and television programs to represent generic scientific and technical equipment, in much the same way that Jacob's ladders and Erlenmeyer flasks full of dry ice had been used by an earlier generation of filmmakers.
Digital storage oscilloscopes use a fast analog-to-digital converter and memory chips to record and show a digital representation of a waveform, yielding much more flexibility for triggering, analysis, and display than is possible with a classic analog oscilloscope.
Oscilloscope (654 words)
The DI-770 oscilloscope is provided with two 1:1 and 10:1 switchable oscilloscope probes.
Add to this the instrument's ability to operate incrementally as a voltmeter, data logger, spectrum analyzer, and a function/arbitrary waveform generator and the instrument is solidly positioned as an alternative to multiple, bulky conventional instruments.
The DI-770 oscilloscope can be directly mounted on any DI-720 or DI-730 Series instrument to create a system combination capable of addressing the entire industrial spectrum of voltages and frequencies.
  More results at FactBites »

 
 

COMMENTARY     


Share your thoughts, questions and commentary here
Your name
Your comments

Want to know more?
Search encyclopedia, statistics and forums:

 


Press Releases |  Feeds | Contact
The Wikipedia article included on this page is licensed under the GFDL.
Images may be subject to relevant owners' copyright.
All other elements are (c) copyright NationMaster.com 2003-5. All Rights Reserved.
Usage implies agreement with terms, 1022, m