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Film Resistors: Coated Core and a Cut Helix
Most axial-leaded resistors are film resistors. A thin resistive film is put on an insulating core, and a helix is cut through it, turning the film into a long, narrow path; the length of that path sets the resistance. Carbon film resistors use a film of carbon and cover about 1 ohm to 10 megohms at 0.125–5 W. Metal film resistors are usually coated with nickel chromium, applied for example by sputtering in a vacuum; cut the same way, they reach tolerances of 0.5–2 % and temperature coefficients of about 50–100 ppm/K. The value is marked on the body with coloured bands, the electronic colour code.
高级
Factory process
说明
1
1
Coat the cores
Coat the cores
Deposit the resistive film on the insulating cores: carbon for carbon-film parts, nickel chromium (for example by sputtering) for metal-film parts.
此步骤所需材料：
电阻器绝缘基体1 as required
碳膜涂层1 as required
镍铬膜涂层1 as required所需工具：
真空溅射室2
2
Cut the helix and fit leads
Cut the helix and fit leads
Cut a helix through the film (the longer and narrower the path, the higher the resistance) and fit end caps with axial leads.
此步骤所需材料：
带引线的电阻器端帽1 as required所需工具：
电阻器刻螺旋槽机3
3
Mark
Mark
Paint the colour bands that give the value and tolerance.
此步骤所需材料：
色环标记漆1 as required材料
5- 1 as required占位符
- 1 as required占位符
- 1 as required占位符
- 1 as required占位符
- 1 as required占位符
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