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Creating a Statistical Process Control Chart (SPC)..... X-Bar

Could I please have some hints and/or examples about how to create SPC charts with LabVIEW? Specially for X-bar... how could I create it from Scratch? Thanks in advance for the time and consideration regarding this matter.


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The thing to remember is that SPC was originally implemented during World War II so we are not talking high-tech here. In fact SPC was originally designed to be done using nothing more than graph paper and a pencil. Given that, it's vitally important that you know about how the process works. Therefore my recommendation is to find a book on SPC and read it. This book will tell you not just how to create the various plot types, but what they do and how. An excellent book I can recommend is:

Understanding Statistical Process Control, Wheeler and Chambers, SPC Press, 2nd edition, 1992, ISBN 0945320132

Mike...

Certified Professional Instructor
Certified LabVIEW Architect
LabVIEW Champion

"... after all, He's not a tame lion..."

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Message 2 of 11
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There is an SPC toolkit for labview. Could be hidden on one of your install cd's.

http://sine.ni.com/nips/cds/view/p/lang/en/nid/10697

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Mike,

Thanks for the book recommendation, Indeed it is a good book. However I do not know how to do this in Labview...... I don't know what approach to take.... I've done this in Excel but in LabVIEW I don't know what route to take (I'm new with Labview) How would you approach it? Thanks.
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Message 4 of 11
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The SPC Toolkit contains X-bar functions. the toolkit is part of the Enterprise Connectivity Toolkit but is also sold separately for U$495. At that price, it's a bargain since you would require more than a couple of days to write and debug your own code.
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SPC will provide clues for your process optimization. The SPC toolkit is more robust and good for industrial view.
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SPC will provide clues for your process optimization. The SPC toolkit is more robust and good for industrial view.
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Message 7 of 11
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Basically, do it the same in LV as you would with pencil and paper. The math is very simple and the plots are not hard to generate. It took me a couple hours to write the code for your basic SPC operations - I would send it to you but I don't have it with me where I am right now...

Mike...

Certified Professional Instructor
Certified LabVIEW Architect
LabVIEW Champion

"... after all, He's not a tame lion..."

For help with grief and grieving.
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Thank you All for your suggestions.
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Message 9 of 11
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hello mikeporter

 could you send this code to me. I want to study it .thanks.

 

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