文档介绍：SOP No. 2110 Rev 11
Title: Calibration and Use of Analytical Balances
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Reference: Current version USP.
Rev. No. Date Revised Revision Summary
1. 09-06-91 Original SOP
2. 10-25-91 Weight for calibration of semimicro balance changed to 2 g
3. 09-30-93 New Format
4. 12-09-93 Added CLP Requirements
5. 12-14-94 Minor revisions, : re-certification of 1 and 50 g Class S
weights
6. 12-17-97 "for 2 weeks" deleted from and OOS investigation added
7. 07-08-98 The QAU responsible for both re-calibration of balances if
results exceed control limits as well as coordination of balance
inspections by an outside service. The results from weekly
weighings are documented in the QA Logbook instead of on 3
X 5” cards, and personnel responsible for conducting weekly
checks updated.
8. 12-06-99 Changed to current SOP format. : semi-micro checked with
additional 10 or 20 mg weight. : added
9. 05-01-00 Sec , , : scope widened to include use of balances.
Sec. , : added.
10. 02-21-02 Sec. : Changed balance check from weekly to daily,
changed reference form to and added reference to
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