System suitability or stability during continuous usage

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before measuring any samples, we have this practice of
* verifying the system precision using an standard material; and
* measuring same standard at a given periodic/frequency ( bracketing standard)
* at a minimum at the end of measuring the standard at the end of analysing the samples. ( bracketing standard)

viz., the system precision is given at NMT 6% or 3% for n=5 ;
the question is about the acceptance criteria for the standard measured at periodic frequency.
option 1 :- the response of bracketing standard is NMT 2% from the average of first 5-standard_measurements.
optioin 2 :- the precision of first 5-standard+1-bracketing standard ( total 6 standards ) - RSD NMT 6%

how to evaluate and simulate above options. pl. guide.
by simple logical representation of values, percentage-difference seems to be better/stringent control of variability of the response of bracketing standard.
 
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