Method for identifying the resistance value of SMT resistors, making it easy to master precise measurement techniques

In the manufacturing process of electronic devices, as one of the common components, the precise measurement of the resistance value of SMT resistors is crucial for ensuring product quality. This article will introduce a simple and practical method for identifying the resistance value of SMT resistors, helping you easily master precise measurement techniques and improve production efficiency

1、 Choose the appropriate measuring tool

1 Multimeter: A multimeter is a widely used multifunctional testing instrument that can measure various parameters such as voltage, current, and resistance. When in use, simply insert the red test pen into the "+" socket and the black test pen into the "-" socket. Then, contact the two plugs with the two ends of the resistance to be tested, and read the value on the screen

2 Oscilloscope: Oscilloscope is a professional electronic measuring instrument that can display voltage and current waveforms in real time. When using, first connect one end of the resistance to be measured to the input port of the oscilloscope, and the other end is grounded; Then turn on the oscilloscope, adjust the triggering level and scanning speed, observe the waveform on the screen, and calculate the resistance value based on the shape and amplitude of the waveform

2、 Identify resistance types

1 Color ring resistance: Color ring resistance is a type of resistor that varies in size based on the color difference resistance value. Usually composed of four color rings, representing the numbers 0-9. For example, a four digit color code of "brown black red gold" indicates that the resistance value of the resistor is 10k Ω. The identification method is as follows: first find the leftmost ring (usually purple), and then read the colors and values of the other rings in a clockwise or counterclockwise direction

2 Mark resistance: Mark resistance is a type of resistor that represents the magnitude of resistance through a scale mark. Usually, each scale represents 10 Ω. The identification method is as follows: directly read the numerical value on the scale

3、 Accurate measurement steps

1 Connect one end of the resistance to be tested to the input port of a multimeter or oscilloscope, and ground the other end. Ensure good contact and avoid contact resistance affecting the measurement results

2 Choose the appropriate measurement method based on the type of resistance. For example, for color ring resistance, a multimeter can be used for measurement; For marking resistors, the values on the scale can be directly read

3 Read the measurement results. Record the values displayed on the multimeter or oscilloscope, paying attention to the units (such as Ω)

4 Analyze measurement errors. Based on the actual situation, analyze the possible sources of errors, such as poor contact, temperature changes, etc., and take corresponding measures to reduce errors

Through the above methods, you can easily master the method of identifying the resistance value of SMT resistors, improve production efficiency, and ensure product quality. I hope it will be helpful to you