Electrical standards are devices that are used as a basis for measurement and are determined experimentally according to definitions of electrical units, and that express their magnitude in the form of an object. The basic standards are resistance, voltage, capacitance, inductance, and AC/DC comparators. [Standard resistor] With 1 Ω as the standard, 10-4 to 108 Ω are made by winding manganin and Ni-Cr-Al resistance wire to minimize inductance, and the resistance change due to temperature is 10-5 to 10-6 /°C at 20°C.The resistors are annealed to stabilize the resistance value and then sealed in containers. Source: Heibonsha World Encyclopedia, 2nd Edition Information |
電気の諸単位を定義に従って実験によって決定し,その大きさを物の形で現示し,測定の基準として使用されるものが電気標準または電気標準器と呼ばれる。抵抗,電圧,容量,インダクタンスの標準器と交直比較器が基本的な標準器である。 [標準抵抗器] 1Ωを基準とし,10-4~108Ωまではマンガニン,Ni‐Cr‐Al抵抗線をインダクタンスの少ないように巻いて作られ,温度による抵抗変化は20℃で10-5~10-6/℃で,抵抗値が安定となるよう焼きなましを加え,容器に密閉したものである。 出典 株式会社平凡社世界大百科事典 第2版について 情報 |
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