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Dear All,
Good afternoon. i think i will be using this forum a lot more now after reading the help topics. it is a very informative forum and credit to all involved.
I am the calibrtaion and MSA controller for my company and we have reintroduced studies throughout the company. so here goes;
attached is an example R+R sheet for a parset ATE.
I wondered if people could give me their interpretation of this chart. as i get nmore confused the more i read it.
the values for the measures resolute to 6 or 7 decimal places.
My NDC is poor and my No. of points outside control limits is also poor.
ok my questions:-
1) there are many distinct categories are there not? each reading is different
so why do i have NDC of less than 4??
2) The software determines the control limits (bottom left of sheet). but how does it nknow how much of this equipments readings are noise.
( it states in the 3rd edition that the points have to be outside these limits to not be confused with noise.)
We prefer to use 6 sigma more than tolerance or spread (against process spread) unless there is no spc chart to provide control limits we then use tolerance.
theior is no op influence so we use the probe cards as the appraisers. (not a problem)
i understand that this is showing that the equipment is just showing that the MS is just telling me it is capasble of measuring the item but with no furhter breakdowns available.
PS. this parameter RDSon doesnt have tol limits it just has to be below1.2e-02 ohms.
my other question what do i do without top and bottom limits? ( i have made the limits 1.2e-02 ( 0 to 1.2e-02)) is this correct??
i am confused in the overall outcome of this study.
i hope its not too much ramble and thanks very much in advance for your responses.
mahender (NXP semiconductors)
i have enclosed a chart of voltage measures also (BVDSS) now these are parametric measures that have a tolerance + and -.
could someone please compare and tell me why one is ok and the other isnt.
thanks all so much...
Good afternoon. i think i will be using this forum a lot more now after reading the help topics. it is a very informative forum and credit to all involved.
I am the calibrtaion and MSA controller for my company and we have reintroduced studies throughout the company. so here goes;
attached is an example R+R sheet for a parset ATE.
I wondered if people could give me their interpretation of this chart. as i get nmore confused the more i read it.

the values for the measures resolute to 6 or 7 decimal places.
My NDC is poor and my No. of points outside control limits is also poor.
ok my questions:-
1) there are many distinct categories are there not? each reading is different
so why do i have NDC of less than 4??
2) The software determines the control limits (bottom left of sheet). but how does it nknow how much of this equipments readings are noise.
( it states in the 3rd edition that the points have to be outside these limits to not be confused with noise.)
We prefer to use 6 sigma more than tolerance or spread (against process spread) unless there is no spc chart to provide control limits we then use tolerance.
theior is no op influence so we use the probe cards as the appraisers. (not a problem)
i understand that this is showing that the equipment is just showing that the MS is just telling me it is capasble of measuring the item but with no furhter breakdowns available.
PS. this parameter RDSon doesnt have tol limits it just has to be below1.2e-02 ohms.
my other question what do i do without top and bottom limits? ( i have made the limits 1.2e-02 ( 0 to 1.2e-02)) is this correct??
i am confused in the overall outcome of this study.
i hope its not too much ramble and thanks very much in advance for your responses.
mahender (NXP semiconductors)
i have enclosed a chart of voltage measures also (BVDSS) now these are parametric measures that have a tolerance + and -.
could someone please compare and tell me why one is ok and the other isnt.
thanks all so much...
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