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USP <41> Balances

Hi,

The upcoming USP update, eff, Dec 1st, 2013 has added repeatability and Accuracy tests.

In Accuracy, it states:

The accuracy of a balance is satisfactory if its weighing value, when tested with a suitable weight, is within 0.10% of the test weight value.

we are having 4 place balances.
My question is:

with this, change, does it mean, we can not weigh less than 1 g on this balance, and will need 5 place balance to weigh less than 1 g?

Thanks in advance

[quote=lalooprasad]Hi,

The upcoming USP update, eff, Dec 1st, 2013 has added repeatability and Accuracy tests.

In Accuracy, it states:

The accuracy of a balance is satisfactory if its weighing value, when tested with a suitable weight, is within 0.10% of the test weight value.

we are having 4 place balances.
My question is:

with this, change, does it mean, we can not weigh less than 1 g on this balance, and will need 5 place balance to weigh less than 1 g?

Thanks in advance[/quote]

earlier it is 0.1, From dec 1st onwards it would be 0.10%

So there is no problem for your needs.

whatever you are following now, you can follow the same.

There is no difference in the guideline.

Only the changes are
1)0.1% becomes 0.10%

2)uncertainity :
3sd/weight should be less than 0.001 becomes 2sd/weight should be less than 0.001

Regards,
Bujji Reddy Kanchi.
9676749937