Interpreting my R+R chart - NDC's and Out of Control Limits

M

mahender

#1
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.:bonk:
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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Miner

Forum Moderator
Staff member
Admin
#2
This study is telling you that this gage is acceptable for inspecting this parameter to tolerance (P/T Ratio = 29%), but is not acceptable for use to control your process (ndc = 1; %GRR = 71.26%) using SPC.

The reason for this is that ndc and %GRR compare the measurement variation to the sample variation, which should represent the actual process variation. The sample variation was nearly the same as the measurement repeatability, so your gage cannot see the part variation (signal) over the measurement variation (noise).
 
P

Pudge 72

#3
That is a very nice chart - would you mind unprotecting it so that new data can be entered and cleared and posting it so that we all could use it?
 
M

mahender

#4
good morning all,
thanks so much miner. that is very useful.
i think that is the conclusion that we came down to roughly.
the equipment cannot determine any variations on this parameter and the current parameters we also do.
we are going to document this as the result the 2 main parameters we measure are fine and acceptable, but the rest of the parameters hover around the 10- 20% area.
we are gioingt to state this as acceptable because the measures are so small we understand that there are natural fluctuations in the equipment based on temp etc. (and the measures could just as easily be noise fluctuations, hence why i have one point outside of the control limits rather than them all)
for example i have a multimeter that has a residual fluctuation on voltage of 47 - 52 uVolts. so the measurement in the nano range for some of these is so small and the equipment can just indicate the value but not show the variation.
in essence some of the parameters measured like this one (RDSON) should have a value of zero. so that is the value required where as the voltage tests we do as mentioned earlier have limits so they are fine.

thanks once again miner.
( maybe i dont need to go on a trasining course i can learn everything on here LOL.)

Pudge, i am sorry and dont want to seem unhelpful but my software is managed and i cannot release it, but if you like i can give you the contact details for the mftr??
let me know.
mahender.

:thanx:
 
I

imie476

#5
Good day,

In the attachment BVDSS.xls. I'm already see in the sheet of EMP and I found that N.B in the colum Estmate of Discrimination Ratio.
what meaning of N.B
 

Miner

Forum Moderator
Staff member
Admin
#6
The spreadsheet owner has not visited the Cove since December 2008. I reviewed the file and could not determine the intent of N.B. The spreadsheet is protected and the formulae are hidden.

You may want to search for a different spreadsheet. There are two such files in my blog on MSA. These are unprotected, and I can answer any questions that you may have concerning them.
 
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