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目的：探讨洁净室浮游粒子测点数的最低限度。方法：测点按ＦＳ２０９Ｄ的计算方法简化为查表法。在静态条件下测试，浮游粒子浓度的均值及其９５％置信上限均应符合规定，方可判定该室达到规定的洁净级别。结果：若按ＦＳ２０９Ｄ的规定最低测点数取２点，各测点的均值虽可达标，但２点ｔ值为６．３，故９５％置信上限往往超标，若增加１个测点则无此弊。结论：洁净室尤其是小于１０ｍ２的小洁净室浮游粒子最低限度测点数应修正为３点，以免评定失误。
Objective: To explore the minimum number of clean particle floating point measurement. Methods: Measuring points by FS 209D calculation method is simplified to look-up table. Under static conditions, the mean value of the suspended particle concentration and its 95% confidence limit should be met in order to determine that the chamber has reached the specified cleanliness level. Results: If according to FS 209D minimum measuring points to take 2 points, although the average of each measuring point can reach the standard, but the 2 t value of 6.3, so 95% confidence limit is often exceeded, if an additional measuring point No such harm. Conclusion: The clean room, especially the small clean room less than 10m2 floating point particle size should be corrected to 3 points to avoid errors in assessment.