Hello, everyone. It's time for a day of study. Today we'll talk about how to read the circuit schematic.
Electrical appliance repair and circuit design are all based on the analysis of circuit schematics, understanding the functions and working principles of electrical appliances, to get the job done. As comrades engaged in this work, we must first have excellent basic skills. We must be able to have a general understanding of circuit schematics with technical parameters, and we can divide functional modules, find out the flow of signals, and determine the role of components. If you do not know the role of the circuit, you can first analyze the relationship between the input and output signals of the circuit. For example, the law of signal change and the relationship between them, the phase problem is the same phase, or anti-phase. The circuit and composition form is an amplifying circuit, an oscillating circuit, a pulse circuit, or a demodulation circuit.
To learn how to repair electrical equipment and design circuits, you must master the principles of each unit circuit. The function blocks are divided, and the elements of the entire circuit can be grouped according to different functions, so that each function block forms a combination of elements of a specific function, such as a basic amplification circuit, a switching circuit, a waveform conversion circuit, and the like. To master several methods of analyzing common circuits, familiarize yourself with the circuit types and analysis steps that are appropriate for each method.
1. The AC equivalent circuit analysis method first draws out the AC equivalent circuit, and then analyzes the AC state of the circuit. That is, when the circuit has a signal input, whether the voltage and current in each circuit of the circuit changes according to the regularity of the input signal, which is amplification and oscillation. Still limiting clipping, shaping, and analysis are equal.
2. DC Equivalent Circuit Analysis Draw a DC equivalent circuit diagram, analyze the DC system parameters of the circuit, find out the quiescent operating point and bias properties of the transistor, and the inter-stage Coupling method. Analyze the status of components and their role in the circuit. For example: the transistor's operating state, such as saturation, amplification, cut-off area, the diode is turned on or off.
3. The frequency characteristic analysis mainly depends on whether the frequency of the circuit itself is compatible with the frequency spectrum of the signal it processes. A rough estimate of its center frequency, upper and lower frequency and bandwidth, etc., for example: various filters, notches, resonances, frequency selection and other circuits.
4. The time constant analysis method mainly analyzes the circuit and properties composed of R, L, C and diodes. The time constant is a parameter that reflects the energy accumulation and the speed of energy consumption on the energy storage element. If the time constant is different, although its form and connection are similar, the role played is still different. Commonly there are coupling circuits, differentiating circuits, integrating circuits, decoupling circuits, and peak detection circuits.
Finally, comparing the actual circuit with the basic principle, according to the role of the component in the circuit, step by step analysis according to the above method, it is not difficult to read. Of course, it is necessary to persevere in learning to truly integrate.
Incremental Encoder is commonly used, and Absolute Encoder is used if there are strict requirements on position and zero position. Servo system should be analyzed in detail, depending on the application situation. Commonly used incremental encoder for speed measurement, which can be used for infinite accumulation measurement; Absolute encoder is used for position measurement, and the position is unique (single or multiple turns). Finally, it depends on the application situation and the purpose and requirements to be realized.
Incremental Linear Encoders,Linear Optical Encoder,Linear Position Encoder,Encoder Bearing Tester
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