Detailed explanation of the principle of high-precision resistance detector

Modern electronic manufacturing and electrical testing fields, high precisionresistanceAs a key instrument, the detector is widely used to measure the accuracy and stability of resistance values. As the precision of electronic components continues to improve, traditional measurement methods can no longer meet high-precision requirements. Therefore, the development and application of high-precision resistance detectors are particularly important. This article will focus on the working principle of a high-precision resistance detector, provide an in-depth analysis of its core technology and measurement process, and help readers fully understand the technical connotation of this instrument.

A high-precision resistance tester is an instrument specially used to measure resistance values, emphasizing the accuracy and repeatability of measurement results. It can detect resistance from milliohm level to megohm level and is suitable for resistance performance testing of electronic components, wires, cables and various electrical equipment. The instrument usually has high resolution, low noise and good temperature stability, ensuring the reliability of the measurement data.

High-precision resistance testers generally use the four-wire measurement method, also known as the Kelvin measurement method. This method uses two wires for power supply and two wires for measuring voltage, effectively eliminating the influence of wire resistance on the measurement results. By separating the current loop and the voltage detection loop, the measurement accuracy is greatly improved, especially suitable for measurementLow value resistor。

In order to ensure the stability and accuracy of measurement, the high-precision resistance detector is equipped with a high-precision constant current source. The constant current source can output stable and accurate current to avoid measurement errors caused by current fluctuations. The stability of the constant current source directly affects the accuracy of voltage acquisition, thereby ensuring the accuracy of resistance calculation.

The measurement of resistance essentially measures the voltage drop caused by current passing through the resistor, so high-precision voltage measurement is key. High-precision resistance testers usually use high-resolution analog-to-digital converters (ADCs) and low-noise amplifier circuits to accurately capture small voltage changes. In this way, even extremely low resistance values ​​can be accurately measured.

The resistance value is greatly affected by temperature. In order to ensure the stability and accuracy of the measurement results, modern high-precision resistance detectors are equipped with a temperature compensation function. The ambient temperature is monitored in real time through the built-in temperature sensor and corrected in conjunction with the resistance temperature coefficient to reduce errors caused by temperature changes.

High-precision resistance detectors usually have an automatic calibration function, which can regularly calibrate the internal measurement circuit to ensure that the instrument maintains high accuracy for a long time. At the same time, error correction is performed on the measurement data through built-in algorithms to further improve the reliability and consistency of the measurement.

Modern high-precision resistance detectors widely use digital signal processing (DSP) technology to filter, amplify and analyze the collected voltage signals. DSP technology can effectively suppress interference signals, improve the measurement signal-to-noise ratio, and ensure the accuracy and stability of measurement data.

The high-precision resistance detector achieves high-precision measurement of resistance values ​​through multiple core technologies such as four-wire measurement method, constant current source technology, high-precision voltage measurement module, temperature compensation, automatic calibration and digital signal processing. The core of its principle is to eliminate measurement error sources, stabilize current output, accurately capture voltage changes, and ensure accurate data through temperature compensation and digital processing. As the electronics manufacturing industry continues to increase its requirements for measurement accuracy, high-precision resistance detectors will play a more important role in quality control and R&D testing. Understanding its working principle will help users better select and use this type of instrument and improve measurement efficiency and product quality.