The oscilloscope is a special device that allows you to explore the parameters of electrical signals supplied to the input of the TV used. Data is converted to a graphic image for further analysis. The resulting "picture" allows you to analyze the signal quality, voltage to determine the technical condition of the television equipment.
Criteria for choosing an oscilloscope for TV repair
There are a number of criteria, based on which it is necessary to choose a device. If you take into account all the characteristics, you can choose the best and most suitable device.
Type of food
Classic models are analog. Recently, the popularity of digital and USB oscilloscopes has been growing, and the second version involves the mandatory use of a computer with a fast processor and a large hard drive.
Number of channels
Be sure to take into account the number of channels for taking measurements between related signals that determine the operability and technical condition of the TV. It is assumed that it is necessary to measure a different number of channels and their subsequent comparison with each other. Most of the modern systems used are based on microcontrollers, and they are mixed signal devices.
Important! Modern designs are distinguished by a complex technical condition, so the use of two-, four-channel oscilloscopes is required. When using a large number of channels, a rise in price of the used equipment is observed, therefore, in terms of functionality and cost, a 2-channel device will be the best option. Models with more than 4 channels are practically not used.
Bandwidth and sample rate
This characteristic is recognized as the most important, because it determines the maximum possible range of signals available for research when determining the functional state of the TV. This parameter largely determines the cost of the oscilloscope.
Attention! When measuring frequencies of 100 MHz, an oscilloscope with an indicator of 300-500 MHz is used, but such equipment will be expensive. In any case, reference to the measured frequencies with an increase in the indicator by 3-5 times is mandatory.
The sampling rate should also be taken into account, and this characteristic is determined by the parameters of the analyzed channels. The optimal bandwidth of the measuring device in real time must be ensured.
Digital or analog oscilloscope: which is better
Analog models are classic, and they are created on the basis of a cathode ray tube, which allows you to convert the signal into graphic form. Experts note the reliability of analog equipment. Main advantages:
- familiar panel for easy use of the oscilloscope;
- the ability to identify the slightest changes in the picture;
- ease of settings;
- affordable cost.
The disadvantages of analog equipment:
- insufficient accuracy, since there is a dependence on the frequency of the analyzed signal and there may be various errors;
- limited bandwidth indicators;
- insufficient functionality to analyze the characteristics of frequencies.
Digital oscilloscopes are becoming more and more popular, because they differ in compliance with the current requirement for instrumentation. Main advantages:
- high accuracy;
- wide bandwidth;
- high-quality bright screen;
- the ability to stop the picture for a certain time;
- the ability to connect to a PC;
- analysis of pulsed network interference;
- detailed data processing.
Disadvantages of digital models:
- complex management;
- insufficient sampling frequency, as a result of which signal details may be jammed or hidden;
- high price.
The correct choice of the oscilloscope for assessing the technical condition of the TV and further repair activities is required.
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