To introduce the control principle of X-R controlchart, and use the principle to control the temperature of coal gas heating furnace.
介绍X - R控制图的基本控制原理，并运用该原理对煤气加热炉的温度进行控制。
2
A kind of optimized arithmetic of weighted controlchart was presented which could incarnate the variety of the smaller warp, an example was given to compare the X-R controlchart.
提出了一种加权控制图的优化算法，这种算法能够反映较小偏差的变化，并以X - R控制图为例加以比较。
3
The X-R Chart is used to be an example to show the set-up process and the daily application issues of the Control Chart.