对1Ω(欧姆)以上阻值的电阻,与标识阻值相比±0.5%以内阻值误差的电阻可称为JEPSUN精密电阻,更高精密的可以做到0.01%精度,也就是电子工程师所说的万分之一精度,此类电阻一般为薄膜电阻,使用此材质的电阻一般才能满足生产工艺要求。这类阻值1Ω以上电阻的普通系列精密度在±5%以上,电子产品上最常见的就是5%精度的电阻,不属于精密电阻范围。1Ω以下阻值的电阻,一般能达到±1%精密度之内,就算做高精度电阻范畴了,因为阻值基数很小,就算是1%的误差,实际的阻值误差已经很小了。更高精密电阻的可以做到±0.5%以内,但工艺要求,技术要求较高。
选用电阻时常有阻值选择的问题,往往遇到选用的阻值是不常用电阻,或特殊阻值很难制造的贴片、插件电阻。为解决此类问题,现将精密电阻常规阻值做以下归类,相关表述只是部分常规电阻,不表示列表以外的阻值不能被制造出来。
以下是电子产品中常用电阻标准阻值常用数字列举如下:
100,101,102,104,105,106,107,110,111,113,114,115,117,118,120,121,123,124,
126,127,129,130,132,133,135,137,138,140,142,143,145,147,149,150,152,154,
156,158,160,162,164,165,167,169,172,174,176,178,180,182,184,187,189,191,
193,196,198;200,203,205,208,210,213,215,218,220,221,223,226,229,232,
234,237,240,243,246,249,252,255,258,261,264,267,270,271,274,277,280,284,
287,291,294,298;300,301,305,309,312,316,320,324,328,330,332,336,340,344,348,352,
357,360,361,365,370,374,379,383,388,390,392,397,400,402,407,412,
417,422,427,432,437,442,448,453,459,464,470,475,481,487,493,499;
500,505,511,517,523,530,536,542,549,556,562,569,576,583,590,597;
600,604,612,619,626,634,642,649,657,665,673,681,690,698;
700,706,715,723,732,741,750,759,768,777,787,796;
800,806,816,825,835,845,856,866,876,887,898;
900,909,920,931,942,953,965,976,988;
以上数字是常用电阻标准阻值阻值常用数字。数字无单位,如383,表示38.3欧姆,383欧姆,3830欧姆,38.3K欧姆等等均可(电阻单位如Ω欧姆,mΩ毫欧,KΩ千欧,MΩ兆欧等)!高精度电阻精度常见如:1%百分之一,0.5%千分之五,0.25%,0.1%千分之一,0.05%万分之五,0.01%万分之一
高精度电阻常规温漂如:±50PPM(TCR50), ±25PPM(TCR25), ±15PPM(TCR15), ±10PPM(TCR10), ±5PPM(TCR5)
以上分析供参考,电阻的生产工艺及各类材料更新迅速,技术发展日新月异。相关表格供需要者查看,以免误用特殊阻值,影响使用方便。
千分之一精密电阻器
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