1. Before installing the resistor, the leads should be scraped and tinned to ensure reliable welding and avoid false or false welding. For high-gain preamplifier current, more attention should be paid to the welding quality, otherwise it will cause an increase in noise. 2. In high-frequency circuits, the leads of resistors should not be too long to reduce the impact of distribution parameters on the circuit. The leads of small resistors should not be cut too short, generally no less than 5mm. When welding, use needle-nose pliers or tweezers to clamp the root of the lead to prevent heat from being transferred into the resistor during welding and causing the resistor to change value. 3. The resistor lead cannot be bent repeatedly to avoid breakage. Do not use excessive force during installation or disassembly to avoid loosening of the resistor volume contact caps, causing hidden dangers. 4. Wirewound resistors with a rated power of 10W or more must be connected horizontally to a special bracket during installation, and a certain amount of heat dissipation space should be left around to facilitate heat dissipation