测量仪器的特性曲线是被测物理值(例如压力)与产生的电值之间关系的图形表示。理想情况下，特性曲线应该是线性的。通常在室温下指定的特性曲线偏差表示测量仪器的精度。小的特性曲线偏差意味着仪器的高精度。测量压力时，除了特性曲线偏差外，还必须考虑热漂移。它是由介质温度变化引起的。

　　原文：

　　The characteristic curve of a measuring instrument is the graphical representation of the relation between the physical value being measured, e.g. pressure, and the resulting electrical value. Ideally, the characteristic curve would be linear. The characteristic curve deviation, usually specified at room temperature, indicates the precision of a measuring instrument. Small characteristic curve deviation implies high precision of the instrument. When measuring pressure, thermal drift must also be accounted for in addition to the characteristic curve deviation. It is caused by changes in the temperature of the medium.