Calibration of Weight Box
1.0 PURPOSE
The purpose of the standard operating procedure is to provide guidelines for calibration of
Weight Box.
2.0 SCOPE
The scope of this standard operating procedure includes calibration of Weight Box.
3.0 RESPONSIBILITY
3.1 Application Scientist
3.2 QA Manager
3.3 Director Technical
4.0 PROCEDURE
4.1 VISUAL EXAMINATION
4.1.1 Check and clean the weights under calibration for the quality and finish of surfaces and
edges, freedom from foreign /extraneous matter and the closeness of the screw knob.
4.1.2 Ensure that no weight is magnetic in nature.
4.1.3 Fractional weights should not be punctured and should be identifiable.
4.2 ANALYTICAL BALANCE:
4.2.1 Ensure that the analytical balance used for weighing should be levelled at zero levelling
and is supported on a vibration free rigid table base.
4.2.2 Ensure that a consistent ambient or fixed room temperature is maintained.
4.2.3 There should be no movement of air, like running of ceiling fan etc.
4.2.4 Ensure cleanliness of the analytical balance.
4.3 CALIBRATION
4.3.1 Weigh one by one the standard set of weights and the weights under calibration.
4.3.2 The standard set of weights must have traceability to a national accredited body.
4.3.3 Repeat the weighing of each set of weights at least two or three times to ensure greater
accuracy and reproducibility.
4.3.4 Ensure the precision and accuracy of weighing.
4.4 REPORTING
4.4.1 Assign the actual mass value for each weight under calibration with respect to the weight
of the reference set of weights.
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