Messages you should pay attention to in use
The resistor is a very common electronic component that is very common on the instrumentation, security equipment, and home appliance control board. For the use of the resistance cabinet mainly considers the resistance, the resistance value r opposes the relative accuracy of the resistance, resistance. The power efficiency of the cabinet is small, and the absolute accuracy can be ignored, mainly considered from the current controller. The following is listed below.
The power of the resistance cabinet can withstand the surrounding temperature of 70 ° C, which may lose its function when the temperature is above 70 ° C.
The surface of the resistor cabinet should avoid conjunction or water droplets, avoiding in a humid place.
The rotational operating force of the resistor cabinet will be light as the temperature increase, and the temperature is reduced. If the potentiometer is used in a low temperature environment, it will be described in order to use a special resistance to low temperature grease.
When installing a rotary resistor, the strength should not be too tight when the nut is fixed to avoid damaging the screw or the poor rotation.
Do not use too long screws when installing the iron shell resistor cabinet, otherwise it is possible to prevent the movement of the slider, or even directly damaging the potentiometer itself.
The resistance cabinet is preferably applied to the voltage adjustment structure, and the current adjustment structure should be avoided because the contact resistance between the resistance and the contact table is not conducive to the passage of the large current.
Resistors When soldering, the welding temperature is too high or too long may result in damage to the potentiometer.
The terminal welding of the plug-in resistors should be completed at 235 ° C ± 5 ° C, 3 seconds, and the welding should be removed from the potentiometer body 1.5 mm or more, and solder flow is not used.
Most of the resistors of the resistor cabinet are made of polycarbonic synthetic resins, avoid other amines such as ammonia water, otherwise it will affect its performance.
The axis or slider of the resistor cabinet should be as short as possible when designing the design. The shorter the shaft or the slider length, the better and stable. The longer the loose, the greater the sway, and the hand is likely to change.
The terminals of the patch resistor should avoid the use of aquiferous flux during welding, otherwise the metal oxidation and material will be molded;
The use of inferior flux should be avoided and poor solder may cause upper tin difficult, resulting in poor contact or disconnection.