电阻器有多少种阻值规格？

为什么有时候我们找不到自己需要的电阻，而要用阻值相近的去代替，或并或串，我是想问，电阻的阻值规格到底是怎么定的？遵循什么规律，在线等啊

有E6系列，E12系列，E24系列，等等。<br />这三个系列，是按照近似等比级数排列的。<br />具体数值，本站下载区有个表，可以看看。

谢谢老大

国家标准规定了电阻的阻值按其精度分为两大系列，<br />分别为E-24系列和E-96系列，E-24系列精度为5%，E-96系列为1%，&nbsp;<br />在这两种系列之外的电阻为非标电阻，较难采购。<br />下面列出了常用的5％和1％精度电阻的标称值，供大家设计时参考。<br />

  

不错但其他的电阻呢？？

<table class=ubb cellspacing=0><TR><td class=ubb></td><td class=ubb>精密电阻器</td><td class=ubb>精密电阻器</td><td class=ubb>精密电阻器</td></TR><TR><td class=ubb></td><td class=ubb>E192</td><td class=ubb>E96</td><td class=ubb>E48</td></TR><TR><td class=ubb>允许偏差±x%</td><td class=ubb>注</td><td class=ubb>注</td><td class=ubb>注</td></TR><TR><td class=ubb>1&nbsp;</td><td class=ubb>100&nbsp;</td><td class=ubb>100&nbsp;</td><td class=ubb>100&nbsp;</td></TR><TR><td class=ubb>2&nbsp;</td><td class=ubb>101&nbsp;</td><td class=ubb></td><td class=ubb></td></TR><TR><td class=ubb>3&nbsp;</td><td class=ubb>102&nbsp;</td><td class=ubb>102&nbsp;</td><td class=ubb></td></TR><TR><td class=ubb>4&nbsp;</td><td class=ubb>104&nbsp;</td><td class=ubb></td><td class=ubb></td></TR><TR><td class=ubb>5&nbsp;</td><td class=ubb>105&nbsp;</td><td class=ubb>105&nbsp;</td><td class=ubb>105&nbsp;</td></TR><TR><td class=ubb>6&nbsp;</td><td class=ubb>106&nbsp;</td><td class=ubb></td><td class=ubb></td></TR><TR><td class=ubb>7&nbsp;</td><td class=ubb>107&nbsp;</td><td class=ubb>107&nbsp;</td><td class=ubb></td></TR><TR><td class=ubb>8&nbsp;</td><td class=ubb>109&nbsp;</td><td class=ubb></td><td class=ubb></td></TR><TR><td class=ubb>9&nbsp;</td><td class=ubb>110&nbsp;</td><td class=ubb>110&nbsp;</td><td class=ubb>110&nbsp;</td></TR><TR><td class=ubb>10&nbsp;</td><td class=ubb>111&nbsp;</td><td class=ubb></td><td class=ubb></td></TR><TR><td class=ubb>11&nbsp;</td><td class=ubb>113&nbsp;</td><td class=ubb>113&nbsp;</td><td class=ubb></td></TR><TR><td class=ubb>12&nbsp;</td><td class=ubb>114&nbsp;</td><td class=ubb></td><td class=ubb></td></TR><TR><td class=ubb>13&nbsp;</td><td class=ubb>115&nbsp;</td><td class=ubb>115&nbsp;</td><td class=ubb>115&nbsp;</td></TR><TR><td class=ubb>14&nbsp;</td><td class=ubb>117&nbsp;</td><td class=ubb></td><td class=ubb></td></TR><TR><td class=ubb>15&nbsp;</td><td class=ubb>118&nbsp;</td><td class=ubb>118&nbsp;</td><td class=ubb></td></TR><TR><td class=ubb>16&nbsp;</td><td class=ubb>120&nbsp;</td><td class=ubb></td><td class=ubb></td></TR><TR><td class=ubb>17&nbsp;</td><td class=ubb>121&nbsp;</td><td class=ubb>121&nbsp;</td><td class=ubb>121&nbsp;</td></TR><TR><td class=ubb>18&nbsp;</td><td class=ubb>123&nbsp;</td><td class=ubb></td><td class=ubb></td></TR><TR><td class=ubb>19&nbsp;</td><td class=ubb>124&nbsp;</td><td class=ubb>124&nbsp;</td><td class=ubb></td></TR><TR><td class=ubb>20&nbsp;</td><td class=ubb>126&nbsp;</td><td class=ubb></td><td class=ubb></td></TR><TR><td class=ubb>21&nbsp;</td><td class=ubb>127&nbsp;</td><td class=ubb>127&nbsp;</td><td class=ubb>127&nbsp;</td></TR><TR><td class=ubb>22&nbsp;</td><td class=ubb>129&nbsp;</td><td class=ubb></td><td class=ubb></td></TR><TR><td class=ubb>23&nbsp;</td><td class=ubb>130&nbsp;</td><td class=ubb>130&nbsp;</td><td class=ubb></td></TR><TR><td class=ubb>24&nbsp;</td><td class=ubb>132&nbsp;</td><td class=ubb></td><td class=ubb></td></TR><TR><td class=ubb>25&nbsp;</td><td class=ubb>133&nbsp;</td><td class=ubb>133&nbsp;</td><td class=ubb>133&nbsp;</td></TR><TR><td class=ubb>26&nbsp;</td><td class=ubb>135&nbsp;</td><td class=ubb></td><td class=ubb></td></TR><TR><td class=ubb>27&nbsp;</td><td class=ubb>137&nbsp;</td><td class=ubb>137&nbsp;</td><td class=ubb></td></TR><TR><td class=ubb>28&nbsp;</td><td class=ubb>138&nbsp;</td><td class=ubb></td><td class=ubb></td></TR><TR><td class=ubb>29&nbsp;</td><td class=ubb>140&nbsp;</td><td class=ubb>140&nbsp;</td><td class=ubb>140&nbsp;</td></TR><TR><td class=ubb>30&nbsp;</td><td class=ubb>142&nbsp;</td><td class=ubb></td><td class=ubb></td></TR><TR><td class=ubb>31&nbsp;</td><td class=ubb>143&nbsp;</td><td class=ubb>143&nbsp;</td><td class=ubb></td></TR><TR><td class=ubb>32&nbsp;</td><td class=ubb>145&nbsp;</td><td class=ubb></td><td class=ubb></td></TR><TR><td class=ubb>33&nbsp;</td><td class=ubb>147&nbsp;</td><td class=ubb>147&nbsp;</td><td class=ubb>147&nbsp;</td></TR><TR><td class=ubb>34&nbsp;</td><td class=ubb>149&nbsp;</td><td class=ubb></td><td class=ubb></td></TR><TR><td class=ubb>35&nbsp;</td><td class=ubb>450&nbsp;</td><td class=ubb>150&nbsp;</td><td class=ubb></td></TR><TR><td class=ubb>36&nbsp;</td><td class=ubb>152&nbsp;</td><td class=ubb></td><td class=ubb></td></TR><TR><td class=ubb>37&nbsp;</td><td class=ubb>154&nbsp;</td><td class=ubb>154&nbsp;</td><td class=ubb>154&nbsp;</td></TR><TR><td class=ubb>38&nbsp;</td><td class=ubb>156&nbsp;</td><td class=ubb></td><td class=ubb></td></TR><TR><td class=ubb>39&nbsp;</td><td class=ubb>158&nbsp;</td><td class=ubb>158&nbsp;</td><td class=ubb></td></TR><TR><td class=ubb>40&nbsp;</td><td class=ubb>160&nbsp;</td><td class=ubb></td><td class=ubb></td></TR><TR><td class=ubb>41&nbsp;</td><td class=ubb>162&nbsp;</td><td class=ubb>162&nbsp;</td><td class=ubb>162&nbsp;</td></TR><TR><td class=ubb>42&nbsp;</td><td class=ubb>164&nbsp;</td><td class=ubb></td><td class=ubb></td></TR><TR><td class=ubb>43&nbsp;</td><td class=ubb>165&nbsp;</td><td class=ubb>165&nbsp;</td><td class=ubb></td></TR><TR><td class=ubb>44&nbsp;</td><td class=ubb>167&nbsp;</td><td class=ubb></td><td class=ubb></td></TR><TR><td class=ubb>45&nbsp;</td><td class=ubb>169&nbsp;</td><td class=ubb>169&nbsp;</td><td class=ubb>169&nbsp;</td></TR><TR><td class=ubb>46&nbsp;</td><td class=ubb>172&nbsp;</td><td class=ubb></td><td class=ubb></td></TR><TR><td class=ubb>47&nbsp;</td><td class=ubb>174&nbsp;</td><td class=ubb>174&nbsp;</td><td class=ubb></td></TR><TR><td class=ubb>48&nbsp;</td><td class=ubb>176&nbsp;</td><td class=ubb></td><td class=ubb></td></TR><TR><td class=ubb>49&nbsp;</td><td class=ubb>178&nbsp;</td><td class=ubb>178&nbsp;</td><td class=ubb>178&nbsp;</td></TR><TR><td class=ubb>50&nbsp;</td><td class=ubb>180&nbsp;</td><td class=ubb></td><td class=ubb></td></TR><TR><td class=ubb>51&nbsp;</td><td class=ubb>182&nbsp;</td><td class=ubb>182&nbsp;</td><td class=ubb></td></TR><TR><td class=ubb>52&nbsp;</td><td class=ubb>184&nbsp;</td><td class=ubb></td><td class=ubb></td></TR><TR><td class=ubb>53&nbsp;</td><td class=ubb>187&nbsp;</td><td class=ubb>187&nbsp;</td><td class=ubb>187&nbsp;</td></TR><TR><td class=ubb>54&nbsp;</td><td class=ubb>189&nbsp;</td><td class=ubb></td><td class=ubb></td></TR><TR><td class=ubb>55&nbsp;</td><td class=ubb>191&nbsp;</td><td class=ubb>191&nbsp;</td><td class=ubb></td></TR><TR><td class=ubb>56&nbsp;</td><td class=ubb>193&nbsp;</td><td class=ubb></td><td class=ubb></td></TR><TR><td class=ubb>57&nbsp;</td><td class=ubb>196&nbsp;</td><td class=ubb>196&nbsp;</td><td class=ubb>196&nbsp;</td></TR><TR><td class=ubb>58&nbsp;</td><td class=ubb>198&nbsp;</td><td class=ubb></td><td class=ubb></td></TR><TR><td class=ubb>59&nbsp;</td><td class=ubb>200&nbsp;</td><td class=ubb>200&nbsp;</td><td class=ubb></td></TR><TR><td class=ubb>60&nbsp;</td><td class=ubb>203&nbsp;</td><td class=ubb></td><td class=ubb></td></TR><TR><td class=ubb>61&nbsp;</td><td class=ubb>205&nbsp;</td><td class=ubb>205&nbsp;</td><td class=ubb>205&nbsp;</td></TR><TR><td class=ubb>62&nbsp;</td><td class=ubb>208&nbsp;</td><td class=ubb></td><td class=ubb></td></TR><TR><td class=ubb>63&nbsp;</td><td class=ubb>210&nbsp;</td><td class=ubb>210&nbsp;</td><td class=ubb></td></TR><TR><td class=ubb>64&nbsp;</td><td class=ubb>213&nbsp;</td><td class=ubb></td><td class=ubb></td></TR><TR><td class=ubb>65&nbsp;</td><td class=ubb>215&nbsp;</td><td class=ubb>215&nbsp;</td><td class=ubb>215&nbsp;</td></TR><TR><td class=ubb>66&nbsp;</td><td class=ubb>218&nbsp;</td><td class=ubb></td><td class=ubb></td></TR><TR><td class=ubb>67&nbsp;</td><td class=ubb>221&nbsp;</td><td class=ubb>221&nbsp;</td><td class=ubb></td></TR><TR><td class=ubb>68&nbsp;</td><td class=ubb>223&nbsp;</td><td class=ubb></td><td class=ubb></td></TR><TR><td class=ubb>69&nbsp;</td><td class=ubb>226&nbsp;</td><td class=ubb>226&nbsp;</td><td class=ubb>226&nbsp;</td></TR><TR><td class=ubb>70&nbsp;</td><td class=ubb>229&nbsp;</td><td class=ubb></td><td class=ubb></td></TR><TR><td class=ubb>71&nbsp;</td><td class=ubb>232&nbsp;</td><td class=ubb>232&nbsp;</td><td class=ubb></td></TR><TR><td class=ubb>72&nbsp;</td><td class=ubb>234&nbsp;</td><td class=ubb></td><td class=ubb></td></TR><TR><td class=ubb>73&nbsp;</td><td class=ubb>237&nbsp;</td><td class=ubb>237&nbsp;</td><td class=ubb>237&nbsp;</td></TR><TR><td class=ubb>74&nbsp;</td><td class=ubb>240&nbsp;</td><td class=ubb></td><td class=ubb></td></TR><TR><td class=ubb>75&nbsp;</td><td class=ubb>243&nbsp;</td><td class=ubb>243&nbsp;</td><td class=ubb></td></TR><TR><td class=ubb>76&nbsp;</td><td class=ubb>246&nbsp;</td><td class=ubb></td><td class=ubb></td></TR><TR><td class=ubb>77&nbsp;</td><td class=ubb>249&nbsp;</td><td class=ubb>249&nbsp;</td><td class=ubb>249&nbsp;</td></TR><TR><td class=ubb>78&nbsp;</td><td class=ubb>252&nbsp;</td><td class=ubb></td><td class=ubb></td></TR><TR><td class=ubb>79&nbsp;</td><td class=ubb>255&nbsp;</td><td class=ubb>255&nbsp;</td><td class=ubb></td></TR><TR><td class=ubb>80&nbsp;</td><td class=ubb>258&nbsp;</td><td class=ubb></td><td class=ubb></td></TR><TR><td class=ubb>81&nbsp;</td><td class=ubb>261&nbsp;</td><td class=ubb>261&nbsp;</td><td class=ubb>261&nbsp;</td></TR><TR><td class=ubb>82&nbsp;</td><td class=ubb>264&nbsp;</td><td class=ubb></td><td class=ubb></td></TR><TR><td class=ubb>83&nbsp;</td><td class=ubb>267&nbsp;</td><td class=ubb>267&nbsp;</td><td class=ubb></td></TR><TR><td class=ubb>84&nbsp;</td><td class=ubb>271&nbsp;</td><td class=ubb></td><td class=ubb></td></TR><TR><td class=ubb>85&nbsp;</td><td class=ubb>274&nbsp;</td><td class=ubb>274&nbsp;</td><td class=ubb>274&nbsp;</td></TR><TR><td class=ubb>86&nbsp;</td><td class=ubb>277&nbsp;</td><td class=ubb></td><td class=ubb></td></TR><TR><td class=ubb>87&nbsp;</td><td class=ubb>280&nbsp;</td><td class=ubb>280&nbsp;</td><td class=ubb></td></TR><TR><td class=ubb>88&nbsp;</td><td class=ubb>284&nbsp;</td><td class=ubb></td><td class=ubb></td></TR><TR><td class=ubb>89&nbsp;</td><td class=ubb>287&nbsp;</td><td class=ubb>287&nbsp;</td><td class=ubb>287&nbsp;</td></TR><TR><td class=ubb>90&nbsp;</td><td class=ubb>291&nbsp;</td><td class=ubb></td><td class=ubb></td></TR><TR><td class=ubb>91&nbsp;</td><td class=ubb>294&nbsp;</td><td class=ubb>294&nbsp;</td><td class=ubb></td></TR><TR><td class=ubb>92&nbsp;</td><td class=ubb>298&nbsp;</td><td class=ubb></td><td class=ubb></td></TR><TR><td class=ubb>93&nbsp;</td><td class=ubb>301&nbsp;</td><td class=ubb>301&nbsp;</td><td class=ubb>301&nbsp;</td></TR><TR><td class=ubb>94&nbsp;</td><td class=ubb>305&nbsp;</td><td class=ubb></td><td class=ubb></td></TR><TR><td class=ubb>95&nbsp;</td><td class=ubb>309&nbsp;</td><td class=ubb>309&nbsp;</td><td class=ubb></td></TR><TR><td class=ubb>96&nbsp;</td><td class=ubb>312&nbsp;</td><td class=ubb></td><td class=ubb></td></TR><TR><td class=ubb>97&nbsp;</td><td class=ubb>316&nbsp;</td><td class=ubb>316&nbsp;</td><td class=ubb>316&nbsp;</td></TR><TR><td class=ubb>98&nbsp;</td><td class=ubb>320&nbsp;</td><td class=ubb></td><td class=ubb></td></TR><TR><td class=ubb>99&nbsp;</td><td class=ubb>324&nbsp;</td><td class=ubb>324&nbsp;</td><td class=ubb></td></TR><TR><td class=ubb>100&nbsp;</td><td class=ubb>328&nbsp;</td><td class=ubb></td><td class=ubb></td></TR><TR><td class=ubb>101&nbsp;</td><td class=ubb>332&nbsp;</td><td class=ubb>332&nbsp;</td><td class=ubb>332&nbsp;</td></TR><TR><td class=ubb>102&nbsp;</td><td class=ubb>336&nbsp;</td><td class=ubb></td><td class=ubb></td></TR><TR><td class=ubb>103&nbsp;</td><td class=ubb>340&nbsp;</td><td class=ubb>340&nbsp;</td><td class=ubb></td></TR><TR><td class=ubb>104&nbsp;</td><td class=ubb>344&nbsp;</td><td class=ubb></td><td class=ubb></td></TR><TR><td class=ubb>105&nbsp;</td><td class=ubb>348&nbsp;</td><td class=ubb>348&nbsp;</td><td class=ubb>348&nbsp;</td></TR><TR><td class=ubb>106&nbsp;</td><td class=ubb>352&nbsp;</td><td class=ubb></td><td class=ubb></td></TR><TR><td class=ubb>107&nbsp;</td><td class=ubb>357&nbsp;</td><td class=ubb>357&nbsp;</td><td class=ubb></td></TR><TR><td class=ubb>108&nbsp;</td><td class=ubb>361&nbsp;</td><td class=ubb></td><td class=ubb></td></TR><TR><td class=ubb>109&nbsp;</td><td class=ubb>365&nbsp;</td><td class=ubb>365&nbsp;</td><td class=ubb>365&nbsp;</td></TR><TR><td class=ubb>110&nbsp;</td><td class=ubb>370&nbsp;</td><td class=ubb></td><td class=ubb></td></TR><TR><td class=ubb>111&nbsp;</td><td class=ubb>374&nbsp;</td><td class=ubb>374&nbsp;</td><td class=ubb></td></TR><TR><td class=ubb>112&nbsp;</td><td class=ubb>379&nbsp;</td><td class=ubb></td><td class=ubb></td></TR><TR><td class=ubb>113&nbsp;</td><td class=ubb>383&nbsp;</td><td class=ubb>383&nbsp;</td><td class=ubb>383&nbsp;</td></TR><TR><td class=ubb>114&nbsp;</td><td class=ubb>388&nbsp;</td><td class=ubb></td><td class=ubb></td></TR><TR><td class=ubb>115&nbsp;</td><td class=ubb>392&nbsp;</td><td class=ubb>392&nbsp;</td><td class=ubb></td></TR><TR><td class=ubb>116&nbsp;</td><td class=ubb>397&nbsp;</td><td class=ubb></td><td class=ubb></td></TR><TR><td class=ubb>117&nbsp;</td><td class=ubb>402&nbsp;</td><td class=ubb>402&nbsp;</td><td class=ubb>402&nbsp;</td></TR><TR><td class=ubb>118&nbsp;</td><td class=ubb>407&nbsp;</td><td class=ubb></td><td class=ubb></td></TR><TR><td class=ubb>119&nbsp;</td><td class=ubb>412&nbsp;</td><td class=ubb>412&nbsp;</td><td class=ubb></td></TR><TR><td class=ubb>120&nbsp;</td><td class=ubb>417&nbsp;</td><td class=ubb></td><td class=ubb></td></TR><TR><td class=ubb>121&nbsp;</td><td class=ubb>422&nbsp;</td><td class=ubb>422&nbsp;</td><td class=ubb>422&nbsp;</td></TR><TR><td class=ubb>122&nbsp;</td><td class=ubb>427&nbsp;</td><td class=ubb></td><td class=ubb></td></TR><TR><td class=ubb>123&nbsp;</td><td class=ubb>432&nbsp;</td><td class=ubb>432&nbsp;</td><td class=ubb></td></TR><TR><td class=ubb>124&nbsp;</td><td class=ubb>437&nbsp;</td><td class=ubb></td><td class=ubb></td></TR><TR><td class=ubb>125&nbsp;</td><td class=ubb>442&nbsp;</td><td class=ubb>442&nbsp;</td><td class=ubb>442&nbsp;</td></TR><TR><td class=ubb>126&nbsp;</td><td class=ubb>448&nbsp;</td><td class=ubb></td><td class=ubb></td></TR><TR><td class=ubb>127&nbsp;</td><td class=ubb>453&nbsp;</td><td class=ubb>453&nbsp;</td><td class=ubb></td></TR><TR><td class=ubb>128&nbsp;</td><td class=ubb>459&nbsp;</td><td class=ubb></td><td class=ubb></td></TR><TR><td class=ubb>129&nbsp;</td><td class=ubb>464&nbsp;</td><td class=ubb>464&nbsp;</td><td class=ubb>464&nbsp;</td></TR><TR><td class=ubb>130&nbsp;</td><td class=ubb>470&nbsp;</td><td class=ubb></td><td class=ubb></td></TR><TR><td class=ubb>131&nbsp;</td><td class=ubb>475&nbsp;</td><td class=ubb>475&nbsp;</td><td class=ubb></td></TR><TR><td class=ubb>132&nbsp;</td><td class=ubb>481&nbsp;</td><td class=ubb></td><td class=ubb></td></TR><TR><td class=ubb>133&nbsp;</td><td class=ubb>487&nbsp;</td><td class=ubb>487&nbsp;</td><td class=ubb>487&nbsp;</td></TR><TR><td class=ubb>134&nbsp;</td><td class=ubb>493&nbsp;</td><td class=ubb></td><td class=ubb></td></TR><TR><td class=ubb>135&nbsp;</td><td class=ubb>499&nbsp;</td><td class=ubb>499&nbsp;</td><td class=ubb></td></TR><TR><td class=ubb>136&nbsp;</td><td class=ubb>515&nbsp;</td><td class=ubb></td><td class=ubb></td></TR><TR><td class=ubb>137&nbsp;</td><td class=ubb>511&nbsp;</td><td class=ubb>511&nbsp;</td><td class=ubb>511&nbsp;</td></TR><TR><td class=ubb>138&nbsp;</td><td class=ubb>517&nbsp;</td><td class=ubb></td><td class=ubb></td></TR><TR><td class=ubb>139&nbsp;</td><td class=ubb>523&nbsp;</td><td class=ubb>523&nbsp;</td><td class=ubb></td></TR><TR><td class=ubb>140&nbsp;</td><td class=ubb>530&nbsp;</td><td class=ubb></td><td class=ubb></td></TR><TR><td class=ubb>141&nbsp;</td><td class=ubb>536&nbsp;</td><td class=ubb>536&nbsp;</td><td class=ubb>536&nbsp;</td></TR><TR><td class=ubb>142&nbsp;</td><td class=ubb>543&nbsp;</td><td class=ubb></td><td class=ubb></td></TR><TR><td class=ubb>143&nbsp;</td><td class=ubb>549&nbsp;</td><td class=ubb>549&nbsp;</td><td class=ubb></td></TR><TR><td class=ubb>144&nbsp;</td><td class=ubb>556&nbsp;</td><td class=ubb></td><td class=ubb></td></TR><TR><td class=ubb>145&nbsp;</td><td class=ubb>562&nbsp;</td><td class=ubb>562&nbsp;</td><td class=ubb>562&nbsp;</td></TR><TR><td class=ubb>146&nbsp;</td><td class=ubb>569&nbsp;</td><td class=ubb></td><td class=ubb></td></TR><TR><td class=ubb>147&nbsp;</td><td class=ubb>576&nbsp;</td><td class=ubb>576&nbsp;</td><td class=ubb></td></TR><TR><td class=ubb>148&nbsp;</td><td class=ubb>583&nbsp;</td><td class=ubb></td><td class=ubb></td></TR><TR><td class=ubb>149&nbsp;</td><td class=ubb>590&nbsp;</td><td class=ubb>590&nbsp;</td><td class=ubb>590&nbsp;</td></TR><TR><td class=ubb>150&nbsp;</td><td class=ubb>597&nbsp;</td><td class=ubb></td><td class=ubb></td></TR><TR><td class=ubb>151&nbsp;</td><td class=ubb>604&nbsp;</td><td class=ubb>604&nbsp;</td><td class=ubb></td></TR><TR><td class=ubb>152&nbsp;</td><td class=ubb>612&nbsp;</td><td class=ubb></td><td class=ubb></td></TR><TR><td class=ubb>153&nbsp;</td><td class=ubb>619&nbsp;</td><td class=ubb>619&nbsp;</td><td class=ubb>619&nbsp;</td></TR><TR><td class=ubb>154&nbsp;</td><td class=ubb>626&nbsp;</td><td class=ubb></td><td class=ubb></td></TR><TR><td class=ubb>155&nbsp;</td><td class=ubb>634&nbsp;</td><td class=ubb>634&nbsp;</td><td class=ubb></td></TR><TR><td class=ubb>156&nbsp;</td><td class=ubb>642&nbsp;</td><td class=ubb></td><td class=ubb></td></TR><TR><td class=ubb>157&nbsp;</td><td class=ubb>649&nbsp;</td><td class=ubb>649&nbsp;</td><td class=ubb>649&nbsp;</td></TR><TR><td class=ubb>158&nbsp;</td><td class=ubb>657&nbsp;</td><td class=ubb></td><td class=ubb></td></TR><TR><td class=ubb>159&nbsp;</td><td class=ubb>667&nbsp;</td><td class=ubb>665&nbsp;</td><td class=ubb></td></TR><TR><td class=ubb>160&nbsp;</td><td class=ubb>673&nbsp;</td><td class=ubb></td><td class=ubb></td></TR><TR><td class=ubb>161&nbsp;</td><td class=ubb>681&nbsp;</td><td class=ubb>681&nbsp;</td><td class=ubb>681&nbsp;</td></TR><TR><td class=ubb>162&nbsp;</td><td class=ubb>690&nbsp;</td><td class=ubb></td><td class=ubb></td></TR><TR><td class=ubb>163&nbsp;</td><td class=ubb>695&nbsp;</td><td class=ubb>695&nbsp;</td><td class=ubb></td></TR><TR><td class=ubb>164&nbsp;</td><td class=ubb>706&nbsp;</td><td class=ubb></td><td class=ubb></td></TR><TR><td class=ubb>165&nbsp;</td><td class=ubb>715&nbsp;</td><td class=ubb>715&nbsp;</td><td class=ubb>715&nbsp;</td></TR><TR><td class=ubb>166&nbsp;</td><td class=ubb>723&nbsp;</td><td class=ubb></td><td class=ubb></td></TR><TR><td class=ubb>167&nbsp;</td><td class=ubb>732&nbsp;</td><td class=ubb>732&nbsp;</td><td class=ubb></td></TR><TR><td class=ubb>168&nbsp;</td><td class=ubb>741&nbsp;</td><td class=ubb></td><td class=ubb></td></TR><TR><td class=ubb>169&nbsp;</td><td class=ubb>750&nbsp;</td><td class=ubb>750&nbsp;</td><td class=ubb>750&nbsp;</td></TR><TR><td class=ubb>170&nbsp;</td><td class=ubb>759&nbsp;</td><td class=ubb></td><td class=ubb></td></TR><TR><td class=ubb>171&nbsp;</td><td class=ubb>769&nbsp;</td><td class=ubb>768&nbsp;</td><td class=ubb></td></TR><TR><td class=ubb>172&nbsp;</td><td class=ubb>777&nbsp;</td><td class=ubb></td><td class=ubb></td></TR><TR><td class=ubb>173&nbsp;</td><td class=ubb>787&nbsp;</td><td class=ubb>787&nbsp;</td><td class=ubb>787&nbsp;</td></TR><TR><td class=ubb>174&nbsp;</td><td class=ubb>796&nbsp;</td><td class=ubb></td><td class=ubb></td></TR><TR><td class=ubb>175&nbsp;</td><td class=ubb>806&nbsp;</td><td class=ubb>806&nbsp;</td><td class=ubb></td></TR><TR><td class=ubb>176&nbsp;</td><td class=ubb>816&nbsp;</td><td class=ubb></td><td class=ubb></td></TR><TR><td class=ubb>177&nbsp;</td><td class=ubb>825&nbsp;</td><td class=ubb>825&nbsp;</td><td class=ubb>825&nbsp;</td></TR><TR><td class=ubb>178&nbsp;</td><td class=ubb>835&nbsp;</td><td class=ubb></td><td class=ubb></td></TR><TR><td class=ubb>179&nbsp;</td><td class=ubb>845&nbsp;</td><td class=ubb>845&nbsp;</td><td class=ubb></td></TR><TR><td class=ubb>180&nbsp;</td><td class=ubb>856&nbsp;</td><td class=ubb></td><td class=ubb></td></TR><TR><td class=ubb>181&nbsp;</td><td class=ubb>866&nbsp;</td><td class=ubb>866&nbsp;</td><td class=ubb>866&nbsp;</td></TR><TR><td class=ubb>182&nbsp;</td><td class=ubb>876&nbsp;</td><td class=ubb></td><td class=ubb></td></TR><TR><td class=ubb>183&nbsp;</td><td class=ubb>887&nbsp;</td><td class=ubb>887&nbsp;</td><td class=ubb></td></TR><TR><td class=ubb>184&nbsp;</td><td class=ubb>898&nbsp;</td><td class=ubb></td><td class=ubb></td></TR><TR><td class=ubb>185&nbsp;</td><td class=ubb>909&nbsp;</td><td class=ubb>909&nbsp;</td><td class=ubb>909&nbsp;</td></TR><TR><td class=ubb>186&nbsp;</td><td class=ubb>920&nbsp;</td><td class=ubb></td><td class=ubb></td></TR><TR><td class=ubb>187&nbsp;</td><td class=ubb>931&nbsp;</td><td class=ubb>931&nbsp;</td><td class=ubb></td></TR><TR><td class=ubb>188&nbsp;</td><td class=ubb>942&nbsp;</td><td class=ubb></td><td class=ubb></td></TR><TR><td class=ubb>189&nbsp;</td><td class=ubb>953&nbsp;</td><td class=ubb>953&nbsp;</td><td class=ubb>953&nbsp;</td></TR><TR><td class=ubb>190&nbsp;</td><td class=ubb>965&nbsp;</td><td class=ubb></td><td class=ubb></td></TR><TR><td class=ubb>191&nbsp;</td><td class=ubb>976&nbsp;</td><td class=ubb>976&nbsp;</td><td class=ubb></td></TR><TR><td class=ubb>192&nbsp;</td><td class=ubb>988&nbsp;</td><td class=ubb></td><td class=ubb></td></TR></table><br /><br /><table class=ubb cellspacing=0><TR><td class=ubb></td><td class=ubb>精密电阻器</td><td class=ubb>精密电阻器</td><td class=ubb>精密电阻器</td><td class=ubb>通用电阻器</td><td class=ubb>通用电阻器</td><td class=ubb>通用电阻器</td></TR><TR><td class=ubb></td><td class=ubb>E192</td><td class=ubb>E96</td><td class=ubb>E48</td><td class=ubb>E24</td><td class=ubb>E12</td><td class=ubb>E6</td></TR><TR><td class=ubb>允许偏差±x%</td><td class=ubb>注</td><td class=ubb>注</td><td class=ubb>注</td><td class=ubb>5&nbsp;</td><td class=ubb>10&nbsp;</td><td class=ubb>20&nbsp;</td></TR><TR><td class=ubb>1&nbsp;</td><td class=ubb>100&nbsp;</td><td class=ubb>100&nbsp;</td><td class=ubb>100&nbsp;</td><td class=ubb>1.0&nbsp;</td><td class=ubb>1.0&nbsp;</td><td class=ubb>1.0&nbsp;</td></TR><TR><td class=ubb>2&nbsp;</td><td class=ubb>101&nbsp;</td><td class=ubb></td><td class=ubb></td><td class=ubb>1.1&nbsp;</td><td class=ubb></td><td class=ubb></td></TR><TR><td class=ubb>3&nbsp;</td><td class=ubb>102&nbsp;</td><td class=ubb>102&nbsp;</td><td class=ubb></td><td class=ubb>1.2&nbsp;</td><td class=ubb>1.2&nbsp;</td><td class=ubb></td></TR><TR><td class=ubb>4&nbsp;</td><td class=ubb>104&nbsp;</td><td class=ubb></td><td class=ubb></td><td class=ubb>1.3&nbsp;</td><td class=ubb></td><td class=ubb></td></TR><TR><td class=ubb>5&nbsp;</td><td class=ubb>105&nbsp;</td><td class=ubb>105&nbsp;</td><td class=ubb>105&nbsp;</td><td class=ubb>1.5&nbsp;</td><td class=ubb>1.5&nbsp;</td><td class=ubb>1.5&nbsp;</td></TR><TR><td class=ubb>6&nbsp;</td><td class=ubb>106&nbsp;</td><td class=ubb></td><td class=ubb></td><td class=ubb>？</td><td class=ubb></td><td class=ubb></td></TR><TR><td class=ubb>7&nbsp;</td><td class=ubb>107&nbsp;</td><td class=ubb>107&nbsp;</td><td class=ubb></td><td class=ubb>1.8&nbsp;</td><td class=ubb>1.8&nbsp;</td><td class=ubb></td></TR><TR><td class=ubb>8&nbsp;</td><td class=ubb>109&nbsp;</td><td class=ubb></td><td class=ubb></td><td class=ubb>2.0&nbsp;</td><td class=ubb></td><td class=ubb></td></TR><TR><td class=ubb>9&nbsp;</td><td class=ubb>110&nbsp;</td><td class=ubb>110&nbsp;</td><td class=ubb>110&nbsp;</td><td class=ubb>2.2&nbsp;</td><td class=ubb>2.2&nbsp;</td><td class=ubb>2.2&nbsp;</td></TR><TR><td class=ubb>10&nbsp;</td><td class=ubb>111&nbsp;</td><td class=ubb></td><td class=ubb></td><td class=ubb>2.4&nbsp;</td><td class=ubb></td><td class=ubb></td></TR><TR><td class=ubb>11&nbsp;</td><td class=ubb>113&nbsp;</td><td class=ubb>113&nbsp;</td><td class=ubb></td><td class=ubb>2.7&nbsp;</td><td class=ubb>2.7&nbsp;</td><td class=ubb></td></TR><TR><td class=ubb>12&nbsp;</td><td class=ubb>114&nbsp;</td><td class=ubb></td><td class=ubb></td><td class=ubb>3.0&nbsp;</td><td class=ubb></td><td class=ubb></td></TR><TR><td class=ubb>13&nbsp;</td><td class=ubb>115&nbsp;</td><td class=ubb>115&nbsp;</td><td class=ubb>115&nbsp;</td><td class=ubb>3.3&nbsp;</td><td class=ubb>3.3&nbsp;</td><td class=ubb>3.3&nbsp;</td></TR><TR><td class=ubb>14&nbsp;</td><td class=ubb>117&nbsp;</td><td class=ubb></td><td class=ubb></td><td class=ubb>3.6&nbsp;</td><td class=ubb></td><td class=ubb></td></TR><TR><td class=ubb>15&nbsp;</td><td class=ubb>118&nbsp;</td><td class=ubb>118&nbsp;</td><td class=ubb></td><td class=ubb>3.9&nbsp;</td><td class=ubb>3.9&nbsp;</td><td class=ubb></td></TR><TR><td class=ubb>16&nbsp;</td><td class=ubb>120&nbsp;</td><td class=ubb></td><td class=ubb></td><td class=ubb>4.3&nbsp;</td><td class=ubb></td><td class=ubb></td></TR><TR><td class=ubb>17&nbsp;</td><td class=ubb>121&nbsp;</td><td class=ubb>121&nbsp;</td><td class=ubb>121&nbsp;</td><td class=ubb>4.7&nbsp;</td><td class=ubb>4.7&nbsp;</td><td class=ubb>4.7&nbsp;</td></TR><TR><td class=ubb>18&nbsp;</td><td class=ubb>123&nbsp;</td><td class=ubb></td><td class=ubb></td><td class=ubb>5.1&nbsp;</td><td class=ubb></td><td class=ubb></td></TR><TR><td class=ubb>19&nbsp;</td><td class=ubb>124&nbsp;</td><td class=ubb>124&nbsp;</td><td class=ubb></td><td class=ubb>5.6&nbsp;</td><td class=ubb>5.6&nbsp;</td><td class=ubb></td></TR><TR><td class=ubb>20&nbsp;</td><td class=ubb>126&nbsp;</td><td class=ubb></td><td class=ubb></td><td class=ubb>6.2&nbsp;</td><td class=ubb></td><td class=ubb></td></TR><TR><td class=ubb>21&nbsp;</td><td class=ubb>127&nbsp;</td><td class=ubb>127&nbsp;</td><td class=ubb>127&nbsp;</td><td class=ubb>6.8&nbsp;</td><td class=ubb>6.8&nbsp;</td><td class=ubb>6.8&nbsp;</td></TR><TR><td class=ubb>22&nbsp;</td><td class=ubb>129&nbsp;</td><td class=ubb></td><td class=ubb></td><td class=ubb>7.5&nbsp;</td><td class=ubb></td><td class=ubb></td></TR><TR><td class=ubb>23&nbsp;</td><td class=ubb>130&nbsp;</td><td class=ubb>130&nbsp;</td><td class=ubb></td><td class=ubb>8.2&nbsp;</td><td class=ubb>8.2&nbsp;</td><td class=ubb></td></TR><TR><td class=ubb>24&nbsp;</td><td class=ubb>132&nbsp;</td><td class=ubb></td><td class=ubb></td><td class=ubb>9.1&nbsp;</td><td class=ubb></td><td class=ubb></td></TR></table><br />*　E192、E96、E48系列阻值，见前表<br />**　所有数值乘上10<SUP>n</SUP>，得到不同数量级的阻值。<br /><br /><br /><br />注：精密电阻器允许偏差系列±x%<br />2&nbsp;<br />1&nbsp;<br />0.5&nbsp;<br />0.2&nbsp;<br />0.1&nbsp;<br />0.05&nbsp;<br />0.02&nbsp;<br />0.01&nbsp;<br />0.005&nbsp;<br />0.002&nbsp;<br />0.001&nbsp;<br /><br />用方由于实际困难无法按上述系列订购精密电阻器，一般规定有效位数，如0.1%精度以下的标称值的位数不得超过4位数。

&nbsp;<H1>E192、E96、E48精密电阻器的标准阻值系列</H1><table class=ubb cellspacing=0><TR><td class=ubb><br /><U>E192</U><br /><U>E96</U><br /><U>E48</U></td><td class=ubb><br />E192</td><td class=ubb><br /><U>E192</U><br /><U>E96</U></td><td class=ubb><br />E192</td><td class=ubb><br /><U>E192</U><br /><U>E96</U><br /><U>E48</U></td><td class=ubb><br />E192</td><td class=ubb><br /><U>E192</U><br /><U>E96</U></td><td class=ubb><br />E192</td></TR><TR><td class=ubb><br /><U>100</U></td><td class=ubb><br />101</td><td class=ubb><br /><B>102</B></td><td class=ubb><br />104</td><td class=ubb><br /><U>105</U></td><td class=ubb><br />106</td><td class=ubb><br /><B>107</B></td><td class=ubb><br />109</td></TR><TR><td class=ubb><br /><U>110</U></td><td class=ubb><br />111</td><td class=ubb><br /><B>113</B></td><td class=ubb><br />114</td><td class=ubb><br /><U>115</U></td><td class=ubb><br />117</td><td class=ubb><br /><B>118</B></td><td class=ubb><br />120</td></TR><TR><td class=ubb><br /><U>121</U></td><td class=ubb><br />123</td><td class=ubb><br /><B>124</B></td><td class=ubb><br />126</td><td class=ubb><br /><U>127</U></td><td class=ubb><br />129</td><td class=ubb><br /><B>130</B></td><td class=ubb><br />132</td></TR><TR><td class=ubb><br /><U>133</U></td><td class=ubb><br />135</td><td class=ubb><br /><B>137</B></td><td class=ubb><br />138</td><td class=ubb><br /><U>140</U></td><td class=ubb><br />142</td><td class=ubb><br /><B>143</B></td><td class=ubb><br />145</td></TR><TR><td class=ubb><br /><U>147</U></td><td class=ubb><br />149</td><td class=ubb><br /><B>450</B></td><td class=ubb><br />152</td><td class=ubb><br /><U>154</U></td><td class=ubb><br />156</td><td class=ubb><br /><B>158</B></td><td class=ubb><br />160</td></TR><TR><td class=ubb><br /><U>162</U></td><td class=ubb><br />164</td><td class=ubb><br /><B>165</B></td><td class=ubb><br />167</td><td class=ubb><br /><U>169</U></td><td class=ubb><br />172</td><td class=ubb><br /><B>174</B></td><td class=ubb><br />176</td></TR><TR><td class=ubb><br /><U>178</U></td><td class=ubb><br />180</td><td class=ubb><br /><B>182</B></td><td class=ubb><br />184</td><td class=ubb><br /><U>187</U></td><td class=ubb><br />189</td><td class=ubb><br /><B>191</B></td><td class=ubb><br />193</td></TR><TR><td class=ubb><br /><U>196</U></td><td class=ubb><br />198</td><td class=ubb><br /><B>200</B></td><td class=ubb><br />203</td><td class=ubb><br /><U>205</U></td><td class=ubb><br />208</td><td class=ubb><br /><B>210</B></td><td class=ubb><br />213</td></TR><TR><td class=ubb><br /><U>215</U></td><td class=ubb><br />218</td><td class=ubb><br /><B>221</B></td><td class=ubb><br />223</td><td class=ubb><br /><U>226</U></td><td class=ubb><br />229</td><td class=ubb><br /><B>232</B></td><td class=ubb><br />234</td></TR><TR><td class=ubb><br /><U>237</U></td><td class=ubb><br />240</td><td class=ubb><br /><B>243</B></td><td class=ubb><br />246</td><td class=ubb><br /><U>249</U></td><td class=ubb><br />252</td><td class=ubb><br /><B>255</B></td><td class=ubb><br />258</td></TR><TR><td class=ubb><br /><U>261</U></td><td class=ubb><br />264</td><td class=ubb><br /><B>267</B></td><td class=ubb><br />271</td><td class=ubb><br /><U>274</U></td><td class=ubb><br />277</td><td class=ubb><br /><B>280</B></td><td class=ubb><br />284</td></TR><TR><td class=ubb><br /><U>287</U></td><td class=ubb><br />291</td><td class=ubb><br /><B>294</B></td><td class=ubb><br />298</td><td class=ubb><br /><U>301</U></td><td class=ubb><br />305</td><td class=ubb><br /><B>309</B></td><td class=ubb><br />312</td></TR><TR><td class=ubb><br /><U>316</U></td><td class=ubb><br />320</td><td class=ubb><br /><B>324</B></td><td class=ubb><br />328</td><td class=ubb><br /><U>332</U></td><td class=ubb><br />336</td><td class=ubb><br /><B>340</B></td><td class=ubb><br />344</td></TR><TR><td class=ubb><br /><U>348</U></td><td class=ubb><br />352</td><td class=ubb><br /><B>357</B></td><td class=ubb><br />361</td><td class=ubb><br /><U>365</U></td><td class=ubb><br />370</td><td class=ubb><br /><B>374</B></td><td class=ubb><br />379</td></TR><TR><td class=ubb><br /><U>383</U></td><td class=ubb><br />388</td><td class=ubb><br /><B>392</B></td><td class=ubb><br />397</td><td class=ubb><br /><U>402</U></td><td class=ubb><br />407</td><td class=ubb><br /><B>412</B></td><td class=ubb><br />417</td></TR><TR><td class=ubb><br /><U>422</U></td><td class=ubb><br />427</td><td class=ubb><br /><B>432</B></td><td class=ubb><br />437</td><td class=ubb><br /><U>442</U></td><td class=ubb><br />448</td><td class=ubb><br /><B>453</B></td><td class=ubb><br />459</td></TR><TR><td class=ubb><br /><U>464</U></td><td class=ubb><br />470</td><td class=ubb><br /><B>475</B></td><td class=ubb><br />481</td><td class=ubb><br /><U>487</U></td><td class=ubb><br />493</td><td class=ubb><br /><B>499</B></td><td class=ubb><br />515</td></TR><TR><td class=ubb><br /><U>511</U></td><td class=ubb><br />517</td><td class=ubb><br /><B>523</B></td><td class=ubb><br />530</td><td class=ubb><br /><U>536</U></td><td class=ubb><br />543</td><td class=ubb><br /><B>549</B></td><td class=ubb><br />556</td></TR><TR><td class=ubb><br /><U>562</U></td><td class=ubb><br />569</td><td class=ubb><br /><B>576</B></td><td class=ubb><br />583</td><td class=ubb><br /><U>590</U></td><td class=ubb><br />597</td><td class=ubb><br /><B>604</B></td><td class=ubb><br />612</td></TR><TR><td class=ubb><br /><U>619</U></td><td class=ubb><br />626</td><td class=ubb><br /><B>634</B></td><td class=ubb><br />642</td><td class=ubb><br /><U>649</U></td><td class=ubb><br />657</td><td class=ubb><br /><B>667</B></td><td class=ubb><br />673</td></TR><TR><td class=ubb><br /><U>681</U></td><td class=ubb><br />690</td><td class=ubb><br /><B>695</B></td><td class=ubb><br />706</td><td class=ubb><br /><U>715</U></td><td class=ubb><br />723</td><td class=ubb><br /><B>732</B></td><td class=ubb><br />741</td></TR><TR><td class=ubb><br /><U>750</U></td><td class=ubb><br />759</td><td class=ubb><br /><B>769</B></td><td class=ubb><br />777</td><td class=ubb><br /><U>787</U></td><td class=ubb><br />796</td><td class=ubb><br /><B>806</B></td><td class=ubb><br />816</td></TR><TR><td class=ubb><br /><U>825</U></td><td class=ubb><br />835</td><td class=ubb><br /><B>845</B></td><td class=ubb><br />856</td><td class=ubb><br /><U>866</U></td><td class=ubb><br />876</td><td class=ubb><br /><B>887</B></td><td class=ubb><br />898</td></TR><TR><td class=ubb><br /><U>909</U></td><td class=ubb><br />920</td><td class=ubb><br /><B>931</B></td><td class=ubb><br />942</td><td class=ubb><br /><U>953</U></td><td class=ubb><br />965</td><td class=ubb><br /><B>976</B></td><td class=ubb><br />988</td></TR><TR><td class=ubb><br /><U>&nbsp;</U></td><td class=ubb><br />&nbsp;</td><td class=ubb><br /><B>&nbsp;</B></td><td class=ubb><br />&nbsp;</td><td class=ubb><br />&nbsp;</td><td class=ubb><br />&nbsp;</td><td class=ubb><br />&nbsp;</td><td class=ubb><br />&nbsp;</td></TR></table><br />表头一栏有系列号的，本列数据适用于该系列。表中数值乘以10<SUP>n</SUP>(n为整数，可正可负)即可得到阻值。<H1>E24、E12、E6通用电阻器的标准阻值系列</H1><table class=ubb cellspacing=0><TR><td class=ubb><br />E24、E12、E6<U></U></td><td class=ubb><br />E24</td><td class=ubb><br />E24、E12<B></B></td><td class=ubb><br />E24</td></TR><TR><td class=ubb><br /><U>1.0</U></td><td class=ubb><br />1.1</td><td class=ubb><br /><B>1.2</B></td><td class=ubb><br />1.3</td></TR><TR><td class=ubb><br /><U>1.5</U></td><td class=ubb><br />1.6？1.7</td><td class=ubb><br /><B>1.8</B></td><td class=ubb><br />2.0</td></TR><TR><td class=ubb><br /><U>2.2</U></td><td class=ubb><br />2.4</td><td class=ubb><br /><B>2.7</B></td><td class=ubb><br />3.0</td></TR><TR><td class=ubb><br /><U>3.3</U></td><td class=ubb><br />3.6</td><td class=ubb><br /><B>3.9</B></td><td class=ubb><br />4.3</td></TR><TR><td class=ubb><br /><U>4.7</U></td><td class=ubb><br />5.1</td><td class=ubb><br /><B>5.6</B></td><td class=ubb><br />6.2</td></TR><TR><td class=ubb><br /><U>6.8</U></td><td class=ubb><br />7.5</td><td class=ubb><br /><B>8.2</B></td><td class=ubb><br />9.1</td></TR></table><br />表头一栏有系列号的，本列数据适用于该系列。表中数值乘以10<SUP>n</SUP>(n为整数，可正可负)即可得到阻值。<H1>精密电阻器允许偏差系列</H1><br />应用中，阻值误差是不能随便取用的，现录入以下误差系列供选择参考。<br />±2%、±1%、±0.5%、±0.2%、±0.1%、±0.05%、±0.02%、±0.01%、±0.005%、±0.002%、±0.001%<br />&nbsp;<br />用方由于实际困难无法按上述系列订购精密电阻器，一般规定有效位数，如0.1%精度以下的标称值的位数不得超过4位数。<H1>通用电阻器允许偏差系列</H1><br />E24为±5%、E12±10%、E6±20%<H1>系列标称值来源：</H1><br />高一个数值A，系列公比为r，经E个等比级数得到10A的阻值，则首末项的关系为：<br />Ar<SUP>E</SUP>=10A，=&gt&nbsp;r=<br />分别取E=6，12，24，48，96，192，可得到我国的6个系列标称值的公比r如下表：<table class=ubb cellspacing=0><TR><td class=ubb><br />E=</td><td class=ubb><br />6</td><td class=ubb><br />12</td><td class=ubb><br />24</td><td class=ubb><br />48</td><td class=ubb><br />96</td><td class=ubb><br />192</td><td class=ubb><br />&nbsp;</td></TR><TR><td class=ubb><br />r=</td><td class=ubb><br />1.468</td><td class=ubb><br />1.212</td><td class=ubb><br />1.100</td><td class=ubb><br />1.049</td><td class=ubb><br />1.024</td><td class=ubb><br />1.012</td><td class=ubb><br />&nbsp;</td></TR></table><br />以E12系列为例，对有关数值加以圆整后即可得到E12数系的标准值，如下表：<table class=ubb cellspacing=0><TR><td class=ubb><br />计算值</td><td class=ubb><br />1.212</td><td class=ubb><br />1.47</td><td class=ubb><br />1.78</td><td class=ubb><br />2.16</td><td class=ubb><br />2.65</td><td class=ubb><br />3.29</td><td class=ubb><br />3.85</td><td class=ubb><br />4.67</td><td class=ubb><br />5.64</td><td class=ubb><br />6.84</td><td class=ubb><br />8.21</td><td class=ubb><br />10</td></TR><TR><td class=ubb><br />圆整后的标准值</td><td class=ubb><br />1.2</td><td class=ubb><br />1.5</td><td class=ubb><br />1.8</td><td class=ubb><br />2.2</td><td class=ubb><br />2.7</td><td class=ubb><br />3.3</td><td class=ubb><br />3.9</td><td class=ubb><br />4.7</td><td class=ubb><br />5.6</td><td class=ubb><br />6.8</td><td class=ubb><br />8.2</td><td class=ubb><br />10</td></TR></table><br />部标SJ418-73，SJ619-73，规定了用不同r值计算出以上6个系列数系的经合理圆整后确定值。<br />&nbsp;<br />总之，系列应当使得相邻阻值在符合某一精度要求的情况下，数值相互衔接，以最少的数列覆盖全面。<H1>电阻器额定功耗系列</H1><br />部标SJ617-73规定的电阻器额定功耗系列为(单位为W)：<br />0.05，0.63，0.1，0.125，0.5，1，2，4，8，10，16，25，40，50，75，100，150，250，500。

<img src="https://bbs.21ic.com/upfiles/img/20076/200762062926297.gif"><img src="https://bbs.21ic.com/upfiles/img/20076/200762062926297.gif"><img src="https://bbs.21ic.com/upfiles/img/20076/200762062926297.gif"><img src="https://bbs.21ic.com/upfiles/img/20076/200762062926297.gif"><img src="https://bbs.21ic.com/upfiles/img/20076/200762062926297.gif">

祝你们端午节快乐

  

(*^__^*) 嘻嘻……

都是高手。贴一张表给大家，更直观！

防尘箱与防水箱的区别
防尘箱：模拟有沙尘的气候环境对试验的样品进行防尘试验和风沙试验；
    防水箱：通过箱内创造的潮湿环境进而转化为雨滴来对试验箱进行试验；这两种环境试验箱在军事，航空航天，和工业上都有着广泛的用途，并且很多行业已经把它作为主要发展项目，环境试验箱也被公认为以后发展的趋势。
   防尘箱和防水箱一潮湿一干燥，看上去两个试验箱没有任何联系，但却存在着无法分割相似性，作为环境试验箱最早出现的两个箱体，在对环境气候的测试项目中至关重要。**来源：http://www.linpin.com.cn/product_show-227.html 林频股份4000 662 888

学习了  小小电阻  学问很多