Practical knowledge of electronic technology Practical knowledge of electronic technology (collected by Zhu Changping on the Internet on June 1, 2006) Common electronic component detection methods | || [pic] || || Component detection is a basic skill for home appliance maintenance. How to accurately and effectively detect the relevant parameters of components and judge whether the components are normal is not a one-size-fits-all thing. Different methods must be used according to different components to judge whether the components are normal or not. Especially for beginners, it is necessary to master the detection methods and experience of common components. The following introduces the detection experience and methods of common electronic components for reference. || 1. Resistor detection method: || 1. Fixed resistor detection. A. Connect two test leads (regardless of positive and negative) to the two ends of the resistor to measure the actual resistance value. In order to improve the measurement accuracy, the range should be selected according to the nominal value of the resistor to be measured. Due to the nonlinear relationship of the ohm scale, its middle section is more refined, so the pointer indication value should be as close to the middle of the scale as possible, that is, within the 20% to 80% arc range of the full scale, to make the measurement more accurate. According to the different resistance error levels. The reading and the nominal resistance are allowed to have an error of ±5%, ±10% or ±20% respectively. If they do not match, the error range is exceeded, which means that the resistance value has changed. B. Note: When testing, especially when measuring resistors with a resistance of more than tens of kΩ, do not touch the test leads and the conductive part of the resistor with your hands; the resistor to be tested should be soldered off from the circuit, and at least one head should be soldered off to prevent other components in the circuit from affecting the test and causing measurement errors; the resistance of the color ring resistor...
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