What is CP Cpk and PP PPK?
Cp, Cpk, Pp and Ppk are all parameters (indices) that can help us to understand how our process is operating relative to the specifications, or in other words, they measure how close our process is running to its specification limits. For requirements we measure the process specifications.
What is PP and PPK?
Process Performance Metrics. Pp is the performance index. It measures how well the data might fit between the spec limits (USL, LSL). It doesn’t care if the process is centered within the limits only if it would fit if it was centered. Ppk is the performance centering index.
What Cpk means?
Creatine phosphokinase (CPK) is an enzyme in the body. It is found mainly in the heart, brain, and skeletal muscle. This article discusses the test to measure the amount of CPK in the blood. Blood is drawn from a vein (venipuncture), usually from the inside of the elbow or the back of the hand.
What is CP value?
Cp is a ratio of the specification spread to the process spread. The process spread is often defined as the 6-sigma spread of the process (that is, 6 times the within-subgroup standard deviation). Higher Cp values indicate a more capable process.
What is PPK formula?
Ppk can be determined by diving the Z score by three. A z score is the same as a standard score; the number of standard deviations above the mean. Z = x – mean of the population / standard deviation. Ppk = ( USL – µ) / 3σ = z / 3.
What is PP PPL PPU PPK?
Ppk is a measure of the overall capability of the process and equals the minimum of PPU and PPL. Ppk is a ratio that compares two values: The distance from the process mean to the closest specification limit (USL or LSL) The one-sided spread of the process (the 3-σ variation) based on its overall variation.
What is CP Cpk formula?
A proper centered process will have Cp = Cpk. An estimate for Cpk = Cp(1-k). Since the max value for k is 1.0, so the value for Cpk will always be less or equal to Cp. Input is required from the customer regarding the lower specification limit (LSL) and the upper specification limit (USL).
What is CP and PK?
Cp and Cpk measure how consistent you are to around your average performance. The ‘k’ stands for ‘centralizing factor. ‘ The index takes into consideration the fact that your data is maybe not centered. Cpk tells us what a process is capable of doing in future, assuming it remains in a state of statistical control.
What is PPK system?
Post Processed Kinematic (PPK) is a GPS correction technology technique that corrects location data after it is collected and uploaded. The data can be uploaded to the cloud for processing or processed using specialise software on your desktop after the flight has been concluded.
What is Cpk formula?
The formula for the calculation of Cpk is Cpk = min(USL – μ, μ – LSL) / (3σ) where USL and LSL are the upper and lower specification limits, respectively. A process with a Cpk of 2.0 is considered excellent, while one with a Cpk of 1.33 is considered adequate.
What is a CP value?
Cp is an index used to assess the width of the process spread in comparison to the width of the specification. It is calculated by dividing the allowable spread by the actual spread. The allowable spread is the difference between the upper and lower specification limits.
What is a PPK solution?
Propeller PPK (post-processed kinematic) is a processing automation solution designed to minimize time in the field and make accuracy an easy, affordable option for businesses of all sizes.