Precision resistance refers to a small class of resistance in the resistor, which is mainly reflected in high reliability and high precision resistance, mainly divided into low resistance value precision resistance and high-precision precision resistance two categories. Low resistance precision resistors are mainly alloy resistors, milliohm resistors, sampling resistors, metal film resistors, manganese copper resistors and shunt resistors, which play the role of circuit detection in the circuit, so it is also known as current detection resistors; The high-precision precision resistance mainly reflects the high precision of the resistance value and the temperature coefficient, mainly reflected in the reliability of the product, and the resistance value is smaller in the phone in different environments, so as to play a key role in the key position of the product.
High-precision precision resistance is also known as thin film resistance, currently mainly based on the chip class, so there is also a chip precision resistance, its main volume is 0201,0402,0603,0805,1206,2512 and so on; The main accuracy is: 0.01%, 0.05%, 0.1%, 0.5%, etc. Temperature coefficient is as follows: 1 PPM, 2 PPM, 5 PPM, 10 PPM, 15 PPM, 25 PPM, 50 PPM, 75 parts per million, etc. The main resistance value of low resistance alloy resistor is reflected in the resistance value of 1R(ohms). The main volume of this kind of product is 0201,0402,0603,0805,1206,1210,2512,2725,2728,4527,0306,0508,0612,1020,1225, etc. There are many special properties of manganese copper shunt and so on.
Precision resistance material characteristics
The material characteristics of precision resistance are mainly reflected in the choice of resistance materials. These materials usually have stable resistivity, low temperature coefficient and good wear resistance. Common precision resistance materials include metal film, metal foil, wire wound resistance wire and so on. These materials undergo special treatment, such as precision alloying, heat treatment, etc., to improve their resistance accuracy and stability.
Precision resistance manufacturing process
Precision machining: The resistance material is fine machined to ensure the accuracy of size and shape.
Special treatment: Heat treatment and chemical treatment of the resistance material to improve its resistance characteristics and stability.
Accurate measurement: Multiple accurate measurements are made during the manufacturing process to ensure the accuracy of the resistance value.
Package protection: The use of appropriate packaging materials and processes to protect the resistor from environmental factors to ensure its long-term stability.
Precision resistance performance advantages
High precision: The precision of the resistance value of the precision resistor can usually reach 0.1%, 0.01% or even higher, to meet the needs of high-precision measurement.
High stability: Precision resistance can maintain the stability of resistance value during long-term use, and is not easily affected by environmental factors such as temperature and humidity.
Low temperature coefficient: The temperature coefficient of the precision resistor is low, which means that its resistance value changes less at different temperatures, helping to maintain the accuracy of the measurement.
Good wear resistance: After special treatment, precision resistance materials have good wear resistance and can maintain stable resistance characteristics for a long time.
Precision resistance applications
Precision measuring instrument: such as voltmeter, ammeter, resistance meter, etc., used to accurately measure the voltage, current and resistance values in the circuit.
Medical equipment: Precision resistors are used in medical equipment to ensure accurate current and voltage control, such as electrocardiogram machines, blood pressure monitors, etc.
Communication systems: Precision resistors are used for signal regulation and measurement in communication systems to ensure the accuracy and stability of signal transmission.
Automatic control system: Precision resistors are used in automatic control systems for accurate current and voltage regulation to achieve system stability control.
Aerospace and military fields: Due to the high precision and high stability characteristics of precision resistors, they are also often used in electronic equipment in the aerospace and military fields.
