science

Oscilloscope types

Oscilloscope types is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Oscilloscope types rather than just read about it. In short: This is a subdivision of the Oscilloscope article, discussing the various types and models of oscilloscopes in greater detail. Digital oscilloscopes While analog devices make use of continually varying voltages, digital devices employ binary numbers which correspond to samples of the voltage.

Key takeaways

Oscilloscope types belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Oscilloscope types to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Oscilloscope types from memory before moving on to harder problems.

Reference excerpt

This is a subdivision of the Oscilloscope article, discussing the various types and models of oscilloscopes in greater detail.

Digital oscilloscopes While analog devices make use of continually varying voltages, digital devices employ binary numbers which correspond to samples of the voltage. In the case of digital oscilloscopes, an analog-to-digital converter (ADC) is used to change the measured voltages into digital information. Waveforms are taken as a series of samples. The samples are stored, accumulating until enough are taken in order to describe the waveform, which are then reassembled for display. Digital technology allows the information to be displayed with brightness, clarity, and stability. There are, however, limitations as with the performance of any oscilloscope. The highest frequency at which the oscilloscope can operate is determined by the analog bandwidth of the front-end components of the instrument and the sampling rate. Digital oscilloscopes can be classified into two primary categories: digital storage oscilloscopes and digital sampling oscilloscopes. Newer variants include PC-based oscilloscopes (which attach to a PC for data processing and display) and mixed-signal oscilloscopes (which employ other functions in addition to voltage measurement).

Digital storage oscilloscope

The digital storage oscilloscope, or DSO for short, is now the preferred type for most industrial applications. Instead of storage-type cathode ray tubes, DSOs use digital memory, which can store data as long as required without degradation. A digital storage oscilloscope also allows complex processing of the signal by high-speed digital signal processing circuits. The vertical input is digitized 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 today is an LCD flat panel. DSOs with color LCDs are common. The sampling data set can be stored to internal or removable storage or sent over a LAN or USB for processing or archiving. A screen image can also be saved to internal or removable storage, or sent to a built-in or externally connected printer, without the need for an oscilloscope camera. The oscilloscope'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.. Digital oscilloscopes are limited principally by the performance of the analog input circuitry, the duration of the sample window, and resolution of the sample rate. When not using equivalent-time sampling, the sampling frequency should be higher than the Nyquist rate which is double the frequency of the highest-frequency component of the observed signal, otherwise aliasing occurs. Advantages over the analog oscilloscope are:

Brighter and bigger display with color to distinguish multiple traces Simple one-shot acquisitions into memory without the issues that come with storage-type CRTs Much more versatile triggers No hiding of noise in the phosphor gloom as it happens on analog oscilloscopes The input signal is not just converted into a line on the screen, it is available as sample data which can be stored or further processed (i.e. through measurements and analysis tools that come with the oscilloscope) Averaging across consecutive samples or scans as well as specific HiRes modes which work through oversampling can lead to higher vertical resolution Versatile measurement and analysis functions make it easy to gather all relevant signal properties Peak detection to find specific events at long timebase settings on digital oscilloscopes with small memory (less relevant as newer oscilloscopes now come with large memories that keep the sample rate sufficiently high even at very long timebase settings) Easy pan and zoom Remote control via USB, Ethernet or GPIB A disadvantage of older digital oscilloscopes is the limited waveform update rate (trigger rate) compared to their analog predecessors, which can make it difficult to spot "glitches" or other rare phenomena with digital oscilloscopes, especially older ones that have no persistence mode. However, thanks to improvements in waveform processing, newer digital oscilloscopes can reach trigger rates in excess of 1 million updates/second, which is more than the roughly 600,000 triggers/sec the best analog oscilloscopes were able to do. Newer digital oscilloscopes also come with analog persistence modes, which replicate the afterglow of an analog oscilloscope's phosphor CRT.

… excerpt ends here. Continue reading the full article.

Illustrations

Worked examples

Example 1 — a first encounter with Oscilloscope types

Start with the simplest possible case. Write down what Oscilloscope types claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Oscilloscope types before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Oscilloscope types ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Oscilloscope types

In research: Oscilloscope types appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Oscilloscope types in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Oscilloscope types is common in secondary-school and first-year university syllabi. It links to neighbouring topics Electronic test equipment, so understanding it makes those chapters shorter.
In everyday life: Look for Oscilloscope types outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Oscilloscope types in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Oscilloscope types means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Oscilloscope types out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Oscilloscope types in simple terms?

This is a subdivision of the Oscilloscope article, discussing the various types and models of oscilloscopes in greater detail. Digital oscilloscopes While analog devices make use of continually varying voltages, digital devices employ binary numbers which correspond to samples of the voltage.

Why does Oscilloscope types matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Oscilloscope types?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Oscilloscope types.