2025年2月18日 · Both Cpk and Sigma Level are valuable tools when looking at your processes and production. So, let’s demystify these elements and get you up to speed. What is Cpk? Cpk is short for Capability Index. It is a measurement of the capability of a process to deliver output that is within the specification limits of a process.

2023年8月6日 · 一 CPK、Sigma和 PPM 的换算关系. 过程能力指数 （ Cp 和 Cpk ）表示的是过程在稳定（即没有特殊原因干扰产出品的特性或者说是在可控（under control）的）状态下能使其产出品达到可接受标准的程度的指标。 按照常识，Cpk越高越好，产品的不良率也越低。

Cp and Cpk are considered short-term potential capability measures for a process. In Six Sigma, we want to describe the process quality in terms of sigma because this gives us an easy way to talk about how capable different processes are using a common mathematical framework.

What Are Cp, Cpk, and Sigma Levels? In quality management and process improvement, Cp, Cpk, and Sigma Levels are fundamental metrics that measure and communicate a process’s ability to meet specifications. These concepts are especially significant in Six Sigma methodology, where reducing defects and ensuring consistent quality are paramount.

Cpk (capability process index) If you also want to study the position of the process in relation to the tolerance limits, you use the Cpk index, which describes the process capability corrected for position. It is not much use having a high Cp index if the process setting is way off centre in relation to the middle of the tolerance range.

西格玛水平Sigma Level：过程能力的一种衡量指标，将过程分布的平均值、标准偏差与质量特性的目标值、规格线结合起来。 西格玛水平越高，过程满足质量要求的能力就越强，反之，西格玛水平越低，过程满足质量要求的能力就越低。

2021年6月11日 · Sigma - the sigma in six sigma just refers to the standard deviation. So how good is good enough? Here is what we normally use for consumer electronics: Good CPK = 1.33 (4σ), this means ~6210 DPPM, we use this, but you don't want to be here. Better CPK = 1.67 (5σ), this means 233 DPPM.

Both Cpk and Sigma Level are valuable tools when looking at your processes and production. So, let’s demystify these elements and get you up to speed. What is Cpk? Cpk is short for...

2023年4月1日 · 3C機構設計爸以在職場的經驗中，整合並濃縮了機構設計人員所必須具備的能力，包括了DPMO和Sigma的轉換，Cpk長期、CPK 短期和Sigma的轉換，Ppk和DPMO、Sigma的互相轉換，讓機構設計人員只需輸入簡單的數據，就能立即得到所需要的結果，加上充足的基本理論以文字描述的支撐，一定讓機構設計人員有十足的把握跟客戶溝通，並做出有效率，而且有統計理論依據的一份報告。 切記，千萬不要跳入統計的學問深淵，否則自己會立馬灰心無力，統計 …

2021年6月23日 · 西格玛水平Sigma Level：过程能力的一种衡量指标，将过程分布的平均值、标准偏差与质量特性的目标值、规格线结合起来。 西格玛水平越高，过程满足质量要求的能力就越强，反之，西格玛水平越低，过程满足质量要求的能力就越低。 我们可以简单的理解为规格线与目标值间的距离最少能容纳k个标准偏差σ，当k = 3时，我们称之为3西格玛水平，上下规格极限之差为6σ。 接下来，我们讨论Cpk和西格玛水平之间的关系。 Cp适用于统计稳定过程，是过程在受 …