The principle of vision limit comparison tester is described. The design process and tested results of the tester performance parameters are given.
叙述视觉极限对比测试仪的原理，介绍该仪器系统的设计过程，给出仪器性能参数的实际测试结果。
The effect laws of process parameters on limit drawing coefficient which has been deduced in this paper provide a reliable theoretical basis for choice and design of the process in practice.
文中得出的工艺参数对极限拉深系数的影响规律为实际生产中工艺选择及制订提供了可靠的理论依据。
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