دامنه مقاومت و استفاده از ترمیستورها

محدوده مقاومت ترمیستورها گسترده است, و مقاومت ترمیستورهای NTC می تواند از ده ها اهم تا ده هزار اهم متغیر باشد, و حتی دستگاه های خاص را می توان بر اساس نیاز سفارشی کرد. مقادیر مقاومت رایج 2.5Ω هستند, 5اوه, 10اوه, 100اوه, و غیره, و خطاهای مقاومت متداول 15±% هستند, ± 20%, 30% ±, OTC. محدوده مقاومت ترمیستورهای PTC معمولاً از 1KΩ تا صدها KΩ است.

ترمیستور NTC 2.5Ω, 5اوه, 10اوه, 100اوه & 3950, 3435

5K B value 3270 1% Freezer temperature sensor probe

NTC temperature sensor 10K B3950 M4 surface mount

Thermistors are a special electronic component whose resistance value changes with temperature. According to the different temperature coefficients, thermistors are mainly divided into two categories: negative temperature coefficient thermistors (NTC) and positive temperature coefficient thermistors (PTC).

Resistance range and application of NTC thermistors
The resistance range of NTC thermistors is quite wide, ranging from tens of ohms to ten thousand ohms. در کاربردهای عملی, we often encounter resistance values ​​of 2.5Ω, 5اوه, 10اوه, OTC. These resistance values ​​are not fixed, and they will show a certain regularity with temperature changes. Specifically, وقتی دما بالا می رود, the resistance of the NTC thermistor will decrease; برعکس, when the temperature decreases, the resistance will increase. This characteristic makes NTC thermistors widely used in the field of temperature measurement and control.

علاوه بر این, the resistance error of the NTC thermistor is also an important parameter that we need to pay attention to. Common resistance errors are ±15%, ± 20%, 30% ±, و غیره, which means that in practical applications, we need to select a suitable resistance error range according to specific needs to ensure the accuracy of measurement and control.

Resistance range and application of PTC thermistors
The resistance range of PTC thermistors is usually from 1KΩ to several hundred KΩ. Its resistance increases when the temperature rises, and it has high sensitivity and stability. PTC thermistors are often used in overcurrent, overvoltage protection and temperature sensors.

The difference between nominal resistance and actual resistance
When understanding the resistance range of thermistors, we also need to distinguish two concepts: nominal resistance and actual resistance. The nominal resistance usually refers to the resistance of the thermistor when the ambient temperature is 25°C, while the actual resistance is the resistance measured under certain temperature conditions. Due to factors such as changes in ambient temperature and aging of the component itself, the actual resistance may deviate from the nominal resistance. از این رو, in practical applications, we need to select and adjust according to the specific situation.

به طور خلاصه, as an important electronic component, thermistors are widely used in various fields. By understanding their resistance range and change rules, we can better select and use thermistors to meet the needs of different scenarios.