How can i reveal the CP/ CPK to my trend labels ?

[[Jo...]]

ZEISS INSPECT only shows Pp/Ppk in trend labels like the 1st picture.

 

But I want to reveal Cp/Cpk in trend labels like the 2nd picture.

 

How can I do that? Or do you have Trend code?

If you have the Trend code, send it to this email: jhpark96@vpkcorp.com.

 

[[DW...]]

Not sure if I can answer this, but where did the second picture come from?

[[Jo...]]

I found this picture in ZEISS forum.

 

 

[[Na...]]

Hi,

we have an FAQ in the techguide for this:
https://techguide.zeiss.com/en/zeiss-inspect-2025/article/how_to_add_Cp_and_Cpk_values_to_the_trendlabels.html

The old thread links to our old (deactivated) FAQ.

Nanno

[[Jo...]]

Thank you for your answer!

[[Ma...]]

Hi Nanno, I’m taking advantage of this thread to ask for a clarification: which standard or regulation is used as a reference for the calculation of Cp and Cpk? Because in the case shown in the image, even though I have some values outside the tolerance limits, the Cp is greater than 1.33, while the Cpk is not acceptable.

[[Jo...]]

Hi Marco,

this behaviour is (can be) "normal", due to what cp and cpk evaluates.

What are Cp and Cpk?

Cp, or Process Capability Index: Measures the potential capability of a process under the assumption of perfect centering.

Cpk, or Process Capability Ratio: Reflects on the actual process mean, presenting a more realistic image of the process capability.

 

[[Ma...]]

Hi Jochen! Thank you for your response. So does Cp have something like a filter that removes the outside measurements? Or does it accept only a certain percentage out of tolerance? because in the example I posted I have a correct Cp, but I have something like 5 measurement out of tolerance. I don't understand this thing.. thank you very much

[[Na...]]

Hi,

we have a small article with

Please sign in to view this username.

's post as a picture here on these values: https://techguide.zeiss.com/en/zeiss-inspect-2026/article/introduction_to_cp_pp_cpk_ppk_values.html