When choosing a TV, consumers are primarily interested in its technical characteristics and screen dimensions. It depends on its size how comfortable it will be to watch TV. In the article, we will consider how to measure the diagonal of a TV if it is not possible to find out its technical characteristics from documents.
To measure or not to measure?
You can measure the diagonal of the TV with a tape measure. How to do it? Read about it below. To calculate the desired value, an ordinary meter will go. However, you can go with a simpler method, in which you do not need to take measurements.
For example, on the body of the device you can find the corresponding marking, where one of the numbers indicates the size of its diagonal. If there is a designation SyncMaster 2232BW on the panel, the first pair of numbers indicates the diagonal size of the TV in inches. If it is important to calculate the diagonal in centimeters, a simple mathematical calculation is made: the size in inches is multiplied by 2.54.
The diagonal of the monitor is prettyeasy to determine, even without resorting to an external examination. When you turn on the computer, you need to go to the "Settings" tab, where the name of the device with the corresponding numbers is indicated. So, in a Windows 7 or Vista program, anywhere on the desktop, you need to right-click and select the "Screen Resolution" line. In the opened window "Screen" the name of the monitor and its size will be indicated.
Tip 1: measure diagonally
If the box from the TV has been thrown away for a long time, the passport is lost and you need to find out the dimensions of the TV, you can do this by measuring its diagonal. To do this, you will need: the TV itself, a tape measure, paper and a pencil.
How to measure the diagonal:
- The roulette is pulled from the lower left corner to the upper right corner. It is important to clarify that the frame of the TV is not taken into account, but only the screen is measured.
- Measuring tape should not sag, but be taut.
- If there is no meter at hand, the measurement is made with a thread, the end is marked or cut off, and then its length is calculated using a ruler.
- The data obtained in centimeters is recorded on paper.
- Now the result needs to be converted to inches. At the rate of 1 inch=2.54 cm, the number in centimeters is divided by 2.54. The answer of calculus will be the size of the diagonal of the TV.
Tip 2: calculating side lengths
If for some reason it is impossible to measure the entire diagonal, you can use the methodside calculations.
How to measure the TV diagonal:
- To do this, you need to measure the height and width of the screen.
- Then a simple mathematical calculation is made on paper. Both known numbers are squared. For example, if the numbers are 30 and 50, squared they are 900 and 2,500.
- The numbers add up and get the sum equal to 3400, divide this number by 100. And then the result is converted to inches, that is, divided by 2.54.
Tip 3: Help from Pythagoras
Many TV owners treat it so carefully that when measuring the diagonal they are afraid to damage the kinescope or matrix. In this case, school knowledge of the Pythagorean theorem will come to the rescue.
How to measure the diagonal correctly?
- For calculus it is necessary to determine the length and width of the screen, and calculate the answer by extracting the root from the sum of the squares of the obtained numbers.
- Sometimes this is the preferred method as it guarantees the safety of the screen.
- If you need to find out the screen size in inches, as in the methods described above, the resulting value is divided by 2.54.
Nuances of measuring TVs: CRT, LCD, plasma
In the absence of any documents on the device, some nuances must be taken into account before measurement. First of all, determine what type of TV: liquid crystal (LCD), plasma, kinescope.
The nuances of how to measure the diagonal of TV screens:
- If it's a CRT TV,measurements are made on the glass of the flask. It is enough to stretch a centimeter diagonally from the bottom corner to the top.
- Before measuring a LCD or Plasma TV, it must be turned on. Move away from the device at a distance of one and a half meters and fix the location of the extreme luminous pixels in the corners. This is due to the fact that in LCD and plasma TVs, the image is limited to a thin black frame around the perimeter of the screen. Therefore, it is important to measure the pixels that are as far apart as possible. In the on state, they approach the TV and apply a centimeter from the extreme luminous pixel diagonally across the screen to the other extreme pixel. The result is recorded and the calculation is made from centimeters to inches in a known way.
Transfer centimeters to inches correctly
How to measure the diagonal of the TV in inches, we figured it out. But what if you still don't understand what an inch is and how to find it?
In the modern world, the inch is not the most common unit of measurement, however, it continues to be used for various calculations. Based on the new calculation systems, it is planned to withdraw this unit of measurement from circulation. But to date, this has not yet happened, so inches continue to be used primarily to indicate the size of a TV screen.
As mentioned earlier, 1 inch equals 2.54 cm.
Consider a simple example:
- Measurement results received: lengthmonitor from corner to corner diagonally - 101.5 cm. Divide the value by 2.54. 101.5 / 2.54 \u003d 39.9. So the diagonal of the TV is 40 inches.
- Received values: width - 49 cm, length 88 cm. Squaring 492=2 401, 882=7 744. Adding: 2401 + 7744=10145. Dividing: 10145 / 100 / 2, 54=39.9. So, if the monitor is 49 cm wide and 88 cm long, the diagonal in inches is 40.
- Square the width and length: 492=2401, 882=7744. Add: 2401 + 7 744=10 145. Find the root: √10 145=100.72. Find the value in inches: 100. 72 / 2. 54=39. 65.
However, you can measure the diagonal of the TV in centimeters. The key parameter of the device screen is the distance, which is measured between opposite corners of the matrix.
With the help of numerous online services, you can quickly convert centimeters to inches and any other units of measurement. Before buying a TV, it is recommended that you familiarize yourself with the basic values \u200b\u200bof the screen size in inches and centimeters. Depending on the size of the room and the distance at which it is planned to watch TV, its dimensions are selected.
Relationship between TV size and diagonal
How to measure the diagonal of the TV, we examined the examples. Why is this needed? Many consumers ask this question.
Two main points that affect the choice of TV diagonal:
- distance from screen to viewpoint;
- screen resolution.
Their relationship is a proven fact. The higher the resolution of the TV device, the closer you can view it without losing image quality. Therefore, with a small resolution, the diagonal of the TV should be smaller, or it is recommended to view it at a distant distance. In practice, anyone can check this. When you watch a TV show with a poor quality image, picture defects are visible up close. If you move further away, they become less noticeable.
For example, if the diagonal of the TV is 40 inches, then to view on-air channels this distance is multiplied by 3, the number 120 is obtained, we translate it into centimeters. This means that the distance from which you can watch TV programs should not be less than 3 meters. If the resolution is 720 pixels, the distance is reduced to 1.9m, and if it is a Full HD model, the distance is reduced to 1.3m.
Therefore, having decided to buy a new TV, you need to make a choice based on a combination of technical characteristics and dimensions of the device. In the store, you can ask to measure the size of the TV if it is not indicated on the device.
