Sampling Method for Stability Study - Implementing MSA Study on Testers

  • Thread starter Jacquiline.Fjeldstad
  • Start date
J

Jacquiline.Fjeldstad

#1
Hi,

our company is starting to implement msa study on testers. but for economy reasons, we plan to implement it on sampling basis only. we'll pick a number of testers only to represent the performance of the tester population as a whole. is it ok to proceed with this procedure? if yes, can you share with me some sampling plan or formulas that we can use?

thanks.
 
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Bev D

Heretical Statistician
Staff member
Super Moderator
#2
depends.
Are the testers replicates of each other?
Are these testers used for testing your product or are they your product?
what do the testers test for?

What do you hope to gain by performign an MSA on a tester??
 
J

Jacquiline.Fjeldstad

#3
Hi Bev D,

Thanks. My answers to your questions are written below.

Are the testers replicates of each other? Yes they are.
Are these testers used for testing your product or are they your product? Yes they are our product. Automotive products.
what do the testers test for? They test for electrical functionality of the devices.

What do you hope to gain by performing an MSA on a tester??
1. conformance to TS16949 requirements
2. several advantages of performing msa like: a. obtain criterion to accept new test equipments, b. obtain basis for evaluation a tester accepted of being deficient, etc..
 
L

Lena66

#4
I think you`d better test it when your product have some changes or your instrument have changes.
 

Miner

Forum Moderator
Staff member
Admin
#5
What do you mean by electrical functionality? Does this mean that they provide a Pass/Fail test result or actual numerical test results? If the latter, can you test against a standard reference value?
 
J

Jacquiline.Fjeldstad

#6
Hi Miner,

Our testers provide Pass/Fail results, and at the same time, they can also provide the actual numerical test results.

Going back to my first question, is it ok if we do sampling on the stability study? If yes, can you share with me some sampling plan design to use?

Thanks!
 
B

brahmaiah

#7
Hi Miner,

Our testers provide Pass/Fail results, and at the same time, they can also provide the actual numerical test results.

Going back to my first question, is it ok if we do sampling on the stability study? If yes, can you share with me some sampling plan design to use?

Thanks!
In your first letter you had said that you are conducting MSA study on your testers.In the proposed MSA study is your tester one of the products or is it a testing equipment tp carry out MSA study?
V.J.Brahmaiah
 

Stijloor

Staff member
Super Moderator
#8
In your first letter you had said that you are conducting MSA study on your testers.In the proposed MSA study is your tester one of the products or is it a testing equipment tp carry out MSA study?
V.J.Brahmaiah
Post #3 in this thread provides the answer to your question.

Stijloor.
 

Caster

An Early Cover
Trusted Information Resource
#9
Hi, our company is starting to implement msa study on testers. but for economy reasons, we plan to implement it on sampling basis only. we'll pick a number of testers only to represent the performance of the tester population as a whole. is it ok to proceed with this procedure? if yes, can you share with me some sampling plan or formulas that we can use? thanks.
This seems to be a case of family MSA studies. Customers often want "every gage that measures my part" to be subject to an MSA study.

However, TS registrars often accept the family gage argument where one study represents all such gages. For example one study for all 6" calipers of one brand.

Do you have tens, hundreds, or thousands? You have nothing to lose with your idea, pick as many as you can handle/afford and see what you learn. If they are all great you have some support for your sampling approach. If the study shows problems, you have work to do to improve all gages.

Good luck.
 

Miner

Forum Moderator
Staff member
Admin
#10
Hi Miner,

Our testers provide Pass/Fail results, and at the same time, they can also provide the actual numerical test results.

Going back to my first question, is it ok if we do sampling on the stability study? If yes, can you share with me some sampling plan design to use?

Thanks!
In your situation, I would consider any MSA study to be more of a design qualification study. Perform an MSA on a small quantity of testers to initially qualify the design. After that, you should follow standard manufacturing controls to ensure that you repeatably build the testers to design requirements.

You then have the option to periodically repeat the MSA at some extended frequency (if desired) or when you change the design. I do not recommend performing MSA as a sampling inspection.
 
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