astronomy

Universal Electronic Test Chart

Universal Electronic Test Chart is a astronomy 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 Universal Electronic Test Chart rather than just read about it. In short: UEIT - Universal Electronic Test Chart (russian: УЭИТ - Универсальная электронная испытательная таблица) is a Soviet/Russian test card, designed to test TVs operating in the analogue SECAM colour standard. UEIT was developed by N.

Key takeaways

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

Reference excerpt

UEIT - Universal Electronic Test Chart (russian: УЭИТ - Универсальная электронная испытательная таблица) is a Soviet/Russian test card, designed to test TVs operating in the analogue SECAM colour standard. UEIT was developed by N. G. Deryugin and V. A. Minaev at the NII Radio Scientific Research Institute as the successor to the monochrome ТИТ-0249 test card with the informal name of "Colour Prevention Table" (TCP). This was the second attempt by the Soviets to create a colour test card, since previous efforts undertaken in 1954 (the ТИТ-0154 test card) in conjunction with the early prototype NIIR/SECAM IV colour television system, were abandoned in favour of regular SECAM III B. On the golden jubilee year of the October Revolution in 1967, colour broadcasts debuted in both Moscow and Leningrad (now Saint Petersburg). Experimental broadcasts using the first three prototype versions of the UEIT (one of which was a modification of the Hungarian HTV TR.0782 test card; but all were collectively referred to as UEIT-1) began from the Ostankino Tower transmitter in 1970, with results being used to create the current version of the test pattern. This new version, called UEIT-2, was introduced in 1971 with several GOST-approved modifications up to 1986, and was used on terrestrial broadcast and on point-to-point links throughout the Soviet Union. The prototypes and current version of the UEIT were used on Soviet television services: six national channels (First Programme, Second Programme, Moscow Programme, Fourth Programme, Fifth Programme and the Sixth Programme) and Third Programme/regional stations. It was also used in some Soviet Republics and allied countries like the Estonian SSR, Latvian SSR, Lithuanian SSR, Kirghiz SSR, Byelorussian SSR, Ukrainian SSR, Kazakh SSR, Tajik SSR and the Georgian SSR, as well as Cuba. It continued to be used on post-Soviet times in Russia and some former Soviet republics and allies. The card was replaced by digital versions with the switch to digital broadcasting in Russia using the DVB-T2 standard by late-2019.

Usage and features

The UEIT allowed to adjust image geometry and picture settings such as brightness, contrast and colour saturation. Other more technical adjustments were also possible, such as cathode-ray tube focus and raster distortions. The card features the following elements:

Grid box - makes up the background of the table. Allows adjustment of CRT convergence and easy reference for test card elements by "line" numbers (as indicated below); Small circles - at lines 3, 4, 17, 18, they have the same function as the Gratings; Center crosshair - in the center of the large circle, allows further convergence and image centering adjustments on CRTs; Table border - fiducial marks for setting proper image geometry and overscan; Circles - provide a way to correct vertical and horizontal raster scan distortions; Colour bars - two sets of bars (75% saturation at lines 6 to 7; 100% saturation at lines 14 to 15) to adjust colour saturation; Greyscale - a set of bars on line 8, that allow setting brightness, contrast, white balance and black level; Contrasting colour stripes - located at line 9, they allow checking of colour transitions; Slanted stripes- located at lines 10 to 11, they allow checking of interlace accuracy; Smooth colour transition - at line 12, it allows to check the color linearity over the full colour spectrum, or a green to magenta transition; Gratings - located at line 13, these help to assess resolution and image focus. They are formed by bursts of sinusoidal signals with frequencies of 2, 3, 4 and 5 MHz, corresponding to resolutions of 220, 330, 440 and 550 horizontal TV lines; Black and white squares- alternating squares at line 16, to evaluate the frequency response of the video chain;

Illustrations

Worked examples

Example 1 — a first encounter with Universal Electronic Test Chart

Start with the simplest possible case. Write down what Universal Electronic Test Chart claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In astronomy, 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 Universal Electronic Test Chart 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 Universal Electronic Test Chart 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 Universal Electronic Test Chart

In research: Universal Electronic Test Chart appears in astronomy 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 Universal Electronic Test Chart 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: Universal Electronic Test Chart is common in secondary-school and first-year university syllabi. It links to neighbouring topics Broadcast engineering, Test cards, so understanding it makes those chapters shorter.
In everyday life: Look for Universal Electronic Test Chart 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.

Affiliate

Preply — study more efficiently by working with a personal tutor. 50% off.

How to study Universal Electronic Test Chart in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Universal Electronic Test Chart 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 Universal Electronic Test Chart out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Universal Electronic Test Chart in simple terms?

Why does Universal Electronic Test Chart matter?

Because it connects several astronomy 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 Universal Electronic Test Chart?

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 Universal Electronic Test Chart.