Instrument Calibration Protocol for Analytical Balance                                                                    

Instrument	Analytical Balance
Instrument ID. Number
Refer SOP No.
Model No.
Make
Date of Calibration
Next due date

Weight Box ID No. :

1. Full range and Accuracy Test :

Observation:

Test Weight (mg/g)	Mass Value of Test Wt. (mg/g)	Maximum Weight (mg/g)	Minimum Weight (mg/g)	Observed Weight (mg/g)
20 mg
50 mg
200 mg
500 mg
2 gm
10 gm
20 gm
50 gm
100 gm
200 gm

Permissible Tolerance Limit: NMT ± 0.10 %

Remarks: Complies / Does Not Complies.

 Calibrated by:                                              Checked by:

2. Repeatability Check :

      Observation:

Test Weight:  50 mg

Sr. No.	Displayed Weight
1
2
3
4
5
6
7
8
9
10

Permissible Tolerance: NMT ± 0.10%

Standard Deviation (S.D): ___________

Calculated Repeatability: ___________

Calculation: 

Compare S.D with 0.41d, where d = scale interval (d = 0.01 mg, For 0 to 81 g) and    (d = 0.1 mg, For 81 to 220 g).

Standard Deviation:

a. If Standard deviation < 0.41d

 Repeatability = (2*0.41d) / desired smallest net weight

b. If Standard deviation < 0.41d

Repeatability = (2*S.D) / desired smallest net weight

Calculation: 

Minimum Weight Calculation:

             Minimum Weight = 2000*S.D.

 Calculation:

Remarks: Complies / Does Not Complies.

Calibrated by:                                              Checked by:

3. Eccentricity Test:

Observation:

Test Weight: 100 gm

Permissible Deviation from the center: NMT ±0.05%

Reference Position	Displayed Weight	Deviation from the Center (C – Displayed Weight)
Center (C)
C1
C2
C3
C4

Calculation:

For C,

= Deviation from the Center * 100/Displayed Weight

=

For C1,

= Deviation from the Center * 100/Displayed Weight

=

For C2,

= Deviation from the Center * 100/Displayed Weight

=

For C3,

= Deviation from the Center * 100/Displayed Weight

=

For C4,

= Deviation from the Center * 100/Displayed Weight

=

Acceptance Criteria: Tolerance Limit = NMT ± 0.05 %.

Remarks: Complies / Does Not Complies.

Calibrated by:                                              Checked by:

4. Linearity Test:

Observation:

Test Weight (mg/g)	Mass value of Test Weight (mg/g)	Observed weight (mg/g)	Deviation (mg/g)	Tolerance Limit : NMT ± 0.05 %
20 gm
50 gm
100 gm
200 gm

Remarks: Complies/ Does not Complies.

Calibrated by:                                              Checked by:

5. Sensitivity Test:

Observation:

Sensitivity = (Change in Weighing / Change in Load) * 100

=

Deviation =     Sensitivity – 100

  Deviation =

Acceptance Criteria: Sensitivity NMT ± 0.05 %.

            Remarks: Complies/ Does not Complies.

Calibrated by:                                              Checked by:

Remarks: Calibration Satisfactory / Not Satisfactory

—	Calibrated By	Checked By	Approved By
Signature
Date
Name
Department	Quality Control	Quality Control	Quality Control