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使用自動熱量計，除正常標定外，發生什麽情況時需立即重新標定容量？

发布时间：2010-03-03 点击次数：1980次

（1）由于各個測溫探頭測出的溫度值（相對溫度值）是不盡相同的，它們的線性度也不是完全一致的，所以當更換測溫探頭時，需重新標定熱量計的熱容量。

（2）熱容量標定與發熱量測定時，室溫相差5℃以上應重新標定熱容量。雖然鉑電阻在某一溫度範圍內的線性較好，當它在規定溫度範圍內工作時不需要作平均分度值作校正，否則就會引起不可忽略的誤差。如沒有條件對測溫探頭作平均分度值校正，則可重新標定儀器的熱容量，使得標定熱容量與測定發熱量時的測溫條件一致，以抵消溫度計的測量誤差。

（3）當用煤標准物質或用標准苯甲酸來檢查熱量計的准確度時，若發現測定值與標准值不一致，也即測定值與標准值之間超過不確定度範圍，或苯甲酸的測定值與標准熱值之差超過50J/g時，找不到其他原因應重新標定熱量計的熱容量。

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