Reliability Test Planner
mosch 
很多公司需要做MTBF的试验，这时候经常需要计算测试的样本数量或者测试时间等，自己算也挺麻烦的，如果有个软件可以帮助的话就最好不过了，今天偶然看SRE的网站看到还真的有人写了这么个软件，和大家分享一下。他是在美国的军方工作，软件是免费试用的，主要是解决大家做MTBF试验中需要的一些计算问题，可以满足MIL-HDBK-781的要求，可以按照定长或者序列等要求，另外如果你想自行定义的话也支持。下面是作者自己对于软件的介绍，大家可以了解一下，如果有兴趣可以尝试一下。
The Reliability Test Planner (RTP) software simplifies the construction of statistical reliability test plans for the exponential and binomial distributions. By specifying test parameters (length, failures, consumers or producers risks), the OC Curves and risks can be quickly calculated. The test plans may then be modified and tailored to meet your needs. The user has the option of choosing from the test plans in MIL-HDBK-781 or creating original test plans, either fixed length or sequential (PRST).
Plots of multiple OC curves may be displayed, allowing for simple comparison of alternative test plans. Monte Carlo simulations may also be performed to determine expected test times or to demonstrate the attributes of your test plan. Test plans may also be saved and retrieved for later use.
如需下载软件请访问下面的链接，另外需要说明的是我的系统是Win7，试了下无法安装，估计只能够在Windows XP下面工作，不过我还没有找到XP的系统来安装，大家可以先试试。