Precautions before using surface mount resistors

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Solder resistors are lightweight and compact, have stable electrical properties, and are suitable for reflow soldering and wave soldering; they also feature high mechanical strength and excellent high-frequency performance. It is also a type of metallic glass uranium resistor. It is a resistor made by mixing metal powder and glass uranium powder and printing them on a substrate using screen printing. Resistant to humidity and high temperatures, with a low temperature coefficient. It can **save circuit space costs and enable more refined design. Surface mount resistors need to be inspected before use; to determine their performance, it is necessary to measure whether the actual resistance value matches the nominal value and whether the error is within the allowable range. The method is to use the resistance setting on a multimeter for measurement. Two points should be noted during measurement: 1. The range must be selected based on the value of the resistor being measured, so that the pointer indicates in the middle section of the scale, which makes it easier to observe. 2. After determining the range for measuring surface mount resistors, it is necessary to zero the instrument. This is done by shorting the two test leads together (by bringing them into direct contact), and then adjusting the \"zeroing\" mechanism so that the pointer points accurately at the \"0\" mark on the Ω scale. Only after that can the resistance value be measured. Also, be careful not to let anyone touch the ends of the resistor or the metal parts of the test leads. Otherwise, it will cause testing errors. The resistance value measured with a multimeter is close to the nominal value. It can be considered that the quality is generally good; if there is a significant difference or it doesn’t work at all, then it’s poor quality.