So, let's study the precautions for processing multi-layer circuit boards? Electronic Manufacturing Services manufacturing process precautions.
The processing process utilizes chemical adsorption or vacuum suction to adsorb zinc oxide as a chemical medium. Conductive materials can have high electrical resistivity and are widely used in fields such as thick laminated boards, resistance paper, thin layer electrodes, liquid crystal dielectric film electrodes, textile materials, thermoplastic polyester film electrodes, etc. Generally speaking, when the resistivity is high, equal to the nominal resistance of 10, the conductivity of the material will be stronger; If the resistivity is high, the oxide resistivity of the resistor decreases, and combined with good structural characteristics, the surface of the resistor is cooled to affect its working performance.
Resistivity: Although the resistivity increases with temperature, the voltage drop of the resistance increases as the resistivity decreases with temperature, resulting in an increase in the distribution power of the resistance and a greater change in resistance. Therefore, the resistance strain is small.

Resistance coefficient: When the resistance temperature increases, its change is opposite, so the distribution power of its resistance (temperature coefficient): When the resistance temperature increases, its change is the same.
The change in resistance temperature is also due to the resistance characteristics of the conductor. As the temperature coefficient of the resistance is a functional relationship, the resistance characteristics can be determined through experiments.
The temperature coefficient of a resistor is generated at the percentage of different temperatures at both ends of the resistor, as the temperature coefficient of the resistor is different.
Experiments have shown that pressing the percentage of a certain value at the working point to the next value is sufficient. For resistors with a 1% resistance value, a 1% level can be used and adjusted appropriately according to this ratio. In this case, after the low resistance value and rapid annealing time have ended, continue to slow down according to the initial state of 02C until it reaches the next value.

● (1% T @ 25°C),Ta=85 °C,24-°C,27-°C,39-°C,68-°C,85-°C。
Rated current: refers to the voltage applied outside the coil of a transformer, usually the specified maximum value. At rated current and high rated voltage, the impact on the communication transformer should be minimized. The adaptability of a working transformer to a single terminal current with a high rated current. The adaptability of the working transformer is measured by the single terminal current of the connection with a larger comparison value. The expression method for cable ratio: The total length of the cable is 3 feet.
Transformer testing instrument is a commonly used advanced testing instrument that utilizes advanced testing methods to detect various system components and analyze equipment damage and functional defects. As a new practical measuring instrument, it is a testing instrument specifically designed for new measurements. The widely used testing instruments mainly include resistance meters, bridges, resistance meters, inductors, crystal oscillators, integrated circuits (ICs), and computer network application systems.