补偿导线与补偿电缆是在一定温度范围内（包括常温）具有与所匹配的热电偶的热电动势值相同的一对或多对带有绝缘层的导线或电缆，用它们连接热电偶与测量装置，以补偿它们与热电偶连接处的温度变化所产生的误差，补偿导线与补偿电缆分为延长型和补偿型两种。

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