Standard Operating Procedure for Calibration Of Calculator
1.0 PURPOSE:
To lay down the procedure for calibration of Calculator.
2.0 SCOPE:
This SOP provides guidance to calibrate the handheld calculators, which are used for simple calculations of analysis in Quality control department.
3.0 RESPONSIBILITY:
| Sr. No. | Department | Responsibility |
| 1 | Quality Control – Analyst | Responsible for carrying out calibration of calculators. |
| 2 | Quality Control –Sr. Manager/ Designee | Responsible for monitoring and ensuring that the activity is performed as per laid down procedure and approving the analytical report. |
| 3 | Quality assurance | Responsible for compliance to the procedure. |
4.0 DEFINITIONS:
None
5.0. PROCEDURE:
5.1.Calibration procedure:
5.1.1. Before starting the calibration operate the calculator and verify the keys as per following procedure.
| Step No. | Operation | Expected Result |
| 1 | Press ‘ON’ or ‘AC’ key | ‘0’ |
| 2 | Press key ‘8’ repeatedly | e.g. ‘88888888888888.’ In case of a 14-digit calculator. |
| 3 | Press ‘AC’ or ‘CE’ | ‘0 |
| 4 | Press 8 and M+ | ‘MI’ and ‘8’ or ‘8’ |
| 5 | Press 8 and M- | ‘MI’ and ‘8’ or ‘8’ |
| 6 | 5 X = | 25 |
| 7 | 0 ÷ 4 = | ‘0’ |
| 8 | 4 ÷ 0 = | ‘E’ or other error indication |
5.1.2. Verify the functions calculated using a calculator with manual calculations.
5.1.3. Calibrate the calculator for Subtraction (-), Addition (+), Multiplication (x), Division (÷), Percentage (%) and Square Root (√).
5.1.4. Verify the functions calculated using a calculator with manual calculations for Subtraction (-), Addition (+), Multiplication (x), Division (÷).
5.1.5. Verify the functions calculated using a calculator with excel sheet for Percentage (%) and Square Root (√).
5.1.6. Operation and Acceptance criteria for calibration parameter
| Sr no | Test Parameter | Operation | Acceptance criteria |
| 1. | Subtraction | 654-321= | 333 |
| 2. | Addition | 123456789 + 987654321= | 1111111110 |
| 3. | Multiplication | – | – |
| – | a. | 12345679 x 8 = | 98765432 |
| – | b. | 12345679 x 9 = | 111111111 |
| 4. | Division | 22 ÷ 7 = | 3.1428 |
| 5. | Percentage | 1÷1 , press % | 100% |
| 6. | Square root | √100 | 10 |
5.1.7. Record all the observed results in respective format.
5.1.8. Manual calculations shall be performed on respective format.
5.2. Labeling for Calculator:
5.2.1. Individual identification number for each newly received calculator shall be given as CAL/XX/YYY
CAL – Calculator
XX – Department
YYY – Serial no.
5.2.2. The identification number allotted to calculators shall be updated in format for Index for calculator identification number.
5.2.3. After successful completion of activity, calibration tag shall be affix as per format.
6.0 Acceptance Criteria:
Not Applicable
7.0 Frequency:
7.1. Internal Calibration: Once every six months.
7.2. External calibration: Scientific calculators should be calibrated by external service providers with the frequency of once in a year.
8.0 Format for recording:
8.1. Analytical Work record for Calibration of Calculator
VERIFICATION OF THE KEYS:
| Step No. | Operation | Observation | Expected result |
| 1 | Press ‘ON’ or ‘AC’ key | ‘0’ | |
| 2 | Press key ‘8’ repeatedly | e.g. ‘88888888888888.’ In case of a 14-digit calculator. | |
| 3 | Press ‘AC’ or ‘CE’ | ‘0 | |
| 4 | Press 8 and M+ | ‘MI’ and ‘8’ or ‘8’ | |
| 5 | Press 8 and M- | ‘MI’ and ‘8’ or ‘8’ | |
| 6 | 5 X = | 25 | |
| 7 | 0 ÷ 4 = | ‘0’ | |
| 8 | 4 ÷ 0 = | ‘E’ or other error indication |
Verified By:__________________ Checked by:_____________________
CALIBRATION OF THE CALCULATOR
| Sr no | Test Parameter | Set value | Calculation using calculator | Manual calculation | Acceptance criteria |
| 1. | Subtraction | 654-321 | 333 | ||
| 2. | Addition | 123456789 + 987654321 | 1111111110 | ||
| 3. | Multiplication | – | – | –- | – |
| – | a. | 12345679 x 8 | 98765432 | ||
| – | b. | 12345679 x 9 | 111111111 | ||
| 4. | Division | 22 ÷ 7 | 3.1428 | ||
| 5. | Percentage | 1÷1, press % | 100% | ||
| 6. | Square root | √100 | 10 |
Inference: The Calculator, ID no.___________________ has been calibrated and is found suitable / not suitable for intended use.
| Calibration done by: | Reviewed by: | Approved by: |
8.2. Format for Manual calculation
Blank Page in SOP template
8.3. Index for calculator identification number
| Sr. No. | Calculator identification number | Year of purchase | Allotted to section | Allotted by Sign/ date | Date of discontinuation | Remarks | Discontinued by Sign/ date |