30178Thermal EMF.fm user-bj

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Specifications	30178Thermal EMF.fm user-bj
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Document Number： 30178For technical questions,contact: ww2bresistors@vishay.comwww.vishay.com Revision:10-Jun-101 VISH

Specifications	30178Thermal EMF.fm user-bj
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Content	Document Number： 30178For technical questions,contact: ww2bresistors@vishay.comwww.vishay.com Revision:10-Jun-101 VISHAY DALE 电阻产品技术说明书低阻值电阻的热电动势技术说明书 Vishay Dale的WSL系列Power Metal Strip®电阻技术生产的电阻具有极低的热电动势。热电动势通常很小，一般在μV 量级，它是由电阻两端的温度变化引起的。对于直流电路中使用的低阻值电阻以及特殊电流检测电阻而言，热电动势是一个需要重点考虑的因素。不过它在交流电路中并不重要。热电动势对于电流检测电阻尤为重要，这是因为热电动势的值可能会大于需要检测的电压。 WSL和WSR系列电阻的热电动势非常低(< 3 μV/℃)，这也是Power Metal Strip电阻技术的一大优势。图1给出了阻值为50mΩ的WSL2512系列Power Metal Strip 电阻与不同技术电阻的特性比较，图示电阻都为金属条形电阻，另加一颗厚膜电阻热电动势特性值，以上图示电阻阻值均为50mΩ。图1 本测试在室温下进行。将一个手指放在通向某一电阻的铜线上，就会在该电阻与铜端子接点处产生大约8℃的温度变化，即室温与手指皮肤温度之差。由图可知，WSL系列电阻的热电动势小于+ 3 μV/℃，而竞争厂家的产品则要大于± 25 μV。 Metal Strip Competitor Thick Film Competitor Metal Strip Competitor Power Metal Strip (Vishay)
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Following Datasheets	thermal-4 (6 pages) Thermal-Behavior-Microelectronic-systems (10 pages) Thermal-Resistance-Pin-Fin_Heatsinks (8 pages) Thermal-Solutions-Brochure (8 pages) thermal-system_mg (1 pages) thermal (9 pages) thermalapplet-1 (9 pages) thermalbond4949a (4 pages) thermalbond4949b (5 pages) thermalbond4950a (4 pages)
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