What is the frequency of determination of minimum weight for analytical weighing balance.

Is it sufficient only during the initial qualification?

Or a periodic determination of minimum weight is required?

If period determination of minimum weight is required, what is the frequency?

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For analytical balances , the minimum weight depends on repeatability test result (Standard Deviation) as illustrated in USP 1251

It is typically done once a year as mentioned in OMCL Annex 8

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When you determine SD of analytical balance during repeatability test , directly the minimum weight can be calculated using minimum weight formula present in USP chapter 1251

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Note that it is recommended to apply a safety factor (2 by default) when determining minimum weight as illustrated in Mettler Toledo GWP.