Brief Description : The Digital Weighing Balance is very sensitive instrument used for weighing substances to the milligram (0.001 g) level.
1. Purpose:
To lay down the procedure for the calibration of digital weighing balances.
2. Scope:
Applicable to digital weighing balances.
3. Responsibility:
Department Head
4. Definitions:
- Digital Weighing Balance: Digital Weighing Balance is very sensitive instrument used for weighing substances to the milligram (0.001 g) level
- Calibration: The demonstration that a particular instrument or device produces results within specified limits by comparison with those produced by a reference or traceable standard over an appropriate range of measurements.
5. Procedure:
- Switch Off the digital weighing balance.
- Clean the pan of the digital weighing balance.
- Switch On the digital weighing balance & allow it to stabilize for at least 10 minutes.
- After stabilization, check the Zero reading.
- If the Zero reading fluctuates then set Zero reading by pushing the button on the balance.
- Calibration shall be performed by putting 20 %, 40 %, 60 %, 80 % & max. weight of balance capacity.
- Place standard weights, sequentially & in ascending order, on the balance.
- Record the displayed readings in Calibration Log.
- Unload the standard weights from the pan, sequentially & in descending order, on the balance.
- If the difference is not within the limit ± 0.5% range, put the under maintenance label on the balance & arrange for repair, recertification &/or recalibration.
- If the difference between standard weight & displayed weight is more than the acceptance criteria, immediately inform to concerned dept. & investigation shall be carried out.
- Frequency : 30 Days ± 7 days
- Acceptance Criteria: ± 0.5 % of the standard weight / actual weight.
- QA shall verify all calibration records, approve. If any deficiency is found then QA shall inform to concerned department & investigation shall be performed.
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