Sound Level Meter (CAL-0260) – Calibration Documents

Calibration Documents: Sound Level Meter (CAL-0260)

Asset ID CAL-0260
Equipment Sound Level Meter
Equipment Type Sound Level Meter
Department Engineering
Area/Location Facility
Process Use Noise monitoring
Parameter Sound
Units dB
Range Min 30
Range Max 130
Acceptance Criteria ±1 dB
Calibration Frequency (days) 365
Calibration Type External
Traceability ISO17025

Table of Contents

  1. Calibration SOP
  2. Calibration Protocol
  3. Calibration Checklist
  4. Deviation Impact Assessment
  5. Calibration Certificate

Calibration SOP

1. Purpose

The calibration of the Sound Level Meter is performed to ensure accurate measurement of sound levels within the facility. This calibration controls risks related to data integrity and compliance with noise monitoring requirements, thereby supporting operational efficiency and regulatory adherence.

2. Scope

  • Asset ID: CAL-0260
  • Equipment Name/Type: Sound Level Meter
  • Department/Area: Engineering
  • Process Use: Noise monitoring
  • Parameter: Sound
  • Range: 30 dB to 130 dB
  • Units: dB
  • Calibration Frequency: 365 days

3. Definitions

  • Calibration: The process of comparing a measurement instrument to a known standard to ensure accuracy.
  • Verification: The process of confirming that a measurement instrument is functioning correctly.
  • Adjustment: The act of modifying a measurement instrument to bring it into alignment with a standard.
  • As Found: The condition of the instrument prior to any adjustments.
  • As Left: The condition of the instrument after adjustments have been made.
  • OOT (Out of Tolerance): A condition where measurement results fall outside the defined acceptance criteria.
  • Drift: The gradual change in the measurement output of an instrument over time.
  • Traceability: The ability to verify the history, location, or application of an item by means of documented recorded identification.
  • Measurement Uncertainty: A parameter that characterizes the range of values within which the true value is expected to lie.
  • Intermediate Check: A periodic check performed between calibrations to ensure continued accuracy.

4. References

  • Company Metrology SOP [TBD]
  • ISO/IEC 17025 traceability via calibration certificates
  • ALCOA+ principles

5. Responsibilities

  • Technician/Metrology: Perform calibration and maintain records.
  • QC/QA Reviewer: Review calibration results and documentation.
  • Owner Department: Ensure equipment is available and ready for calibration.
  • External Service Provider: Conduct external calibration as per the defined schedule.

6. Safety & Preconditions

  • Ensure the calibration area is clean and free from contaminants.
  • Verify environmental controls are within specified limits.
  • Allow the Sound Level Meter to warm up and stabilize as per manufacturer guidelines.
  • Check that the equipment is leveled and positioned correctly.
  • Confirm power supply is stable and within specifications.
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7. Standards & Tools

  • Reference Standards Required: [TBD]
  • Traceability Statement: ISO17025
  • Certificate Validity Check: Ensure calibration certificates are current and valid.

8. Calibration Strategy

Calibration will follow the As Found and As Left logic:

  • Minimum number of points: At least 5 points including endpoints (30 dB and 130 dB) and midpoints.
  • Replicate readings at each point: 3 repeats as a best practice.

9. Step-by-Step Procedure

  1. Preparation: Gather all necessary tools and reference standards.
  2. Stabilization: Allow the Sound Level Meter to stabilize in the calibration environment.
  3. As Found checks and data capture: Record initial measurements at defined points.
  4. Adjustment rules: If OOT is detected, follow escalation procedures for adjustments.
  5. As Left verification: Confirm that the instrument is within tolerance after adjustments.
  6. Labeling + documentation completion: Complete all required documentation and label the equipment accordingly.

Record raw observations contemporaneously to ensure data integrity (ALCOA+).

10. Acceptance Criteria & Calculations

Acceptance criteria: ±1 dB

Error calculation formula: Error = Observed Value – True Value

Pass/Fail Logic: If the absolute value of error is within acceptance criteria, mark as pass; otherwise, mark as fail.

Rounding rule: [TBD]

11. Handling OOT / Failures

  • Immediate containment: Tag equipment and cease use.
  • Notification & deviation initiation: Notify relevant personnel of OOT condition.
  • Impact assessment trigger: Define impact window and review affected results/batches.
  • Recalibration after repair/adjustment: Ensure recalibration is performed post-adjustment.
  • QA disposition placeholders: [TBD]

12. Records & Retention

  • Logbook entries: Document all calibration activities.
  • Calibration report/certificate filing: Maintain records in accordance with company policy.
  • e-Records if applicable: [TBD]
  • Label content requirements: Include calibrated date, due date, technician name, and status.

13. Annexures

Annexure A: Calibration Data Sheet

Test Points Reference Observed Error Acceptance Pass/Fail As Found As Left
[TBD] [TBD] [TBD] [TBD] [TBD] [TBD] [TBD] [TBD]

Annexure B: Quick Checklist

  • Calibration area is clean and controlled.
  • Equipment is warmed up and stable.
  • All tools and standards are available.

Annexure C: Example Label Text

Calibration Date: [TBD]

Due Date: [TBD]

Calibrated By: [TBD]

Status: [TBD]

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Calibration Protocol

Calibration Protocol

Protocol ID Asset ID Equipment Name Equipment Type Dept Area Process Use Parameter Units Range Acceptance Criteria Frequency Calibration Type Traceability
[TBD] CAL-0260 Sound Level Meter Sound Level Meter Engineering Facility Noise monitoring Sound dB 30 – 130 ±1 dB 365 days External ISO17025
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Environmental Conditions

Temperature: [TBD]

Relative Humidity: [TBD]

Vibration: [TBD]

Drafts: [TBD]

Test Point Selection

  • Minimum: 30 dB
  • 25% of Range: 55 dB
  • 50% of Range: 80 dB
  • 75% of Range: 105 dB
  • Maximum: 130 dB

Results Table

Test Point Ref Value Observed (As Found) Error Limit Pass/Fail Observed (As Left) Error Pass/Fail
30 dB [TBD] [TBD] [TBD] ±1 dB [TBD] [TBD] [TBD] [TBD]
55 dB [TBD] [TBD] [TBD] ±1 dB [TBD] [TBD] [TBD] [TBD]
80 dB [TBD] [TBD] [TBD] ±1 dB [TBD] [TBD] [TBD] [TBD]
105 dB [TBD] [TBD] [TBD] ±1 dB [TBD] [TBD] [TBD] [TBD]
130 dB [TBD] [TBD] [TBD] ±1 dB [TBD] [TBD] [TBD] [TBD]

Stepwise Instructions

  1. Preparation: Ensure the sound level meter is clean and free from obstructions. Verify that the equipment is within the calibration frequency.
  2. Stabilization: Allow the sound level meter to stabilize for at least 30 minutes before taking measurements.
  3. Performing Readings: Take three replicate readings at each test point. Record all observed values.
  4. Calculating Error: Calculate the error for each observed value using the formula: Error = Observed Value – Ref Value.
  5. Evaluation: Compare the calculated errors against the acceptance criteria of ±1 dB.
  6. Documentation: Complete the results table and ensure all data is recorded accurately, maintaining ALCOA+ principles (Attributable, Legible, Contemporaneous, Original, Accurate).

Deviation Instruction for OOT

If any observed value is outside the acceptance criteria:

  • Stop use of the sound level meter.
  • Notify the supervisor immediately.
  • Open a deviation report.
  • Quarantine impacted results window: [TBD]
  • Await QA decision on further actions.

Approvals

Prepared Reviewed Approved
[Signature/Date] [Signature/Date] [Signature/Date]

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Calibration Checklist

Asset ID Equipment Dept Area Parameter Range Acceptance Frequency Traceability
CAL-0260 Sound Level Meter Engineering Facility Sound 30 – 130 dB ±1 dB 365 days ISO17025

Pre-calibration

  • [ ] Verify environmental conditions are within specified limits
  • [ ] Allow equipment to warm up for the recommended duration
  • [ ] Clean the equipment as per SOP
  • [ ] Ensure the sound level meter is properly leveled
  • [ ] Check validity of reference standards
  • [ ] Confirm logbook is ready for data entry

As Found Execution

  • [ ] Set the sound level meter to specified setpoints
  • [ ] Perform repeat measurements for accuracy
  • [ ] Record raw data in the logbook
  • [ ] Perform necessary calculations for results
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OOT Immediate Actions

  • [ ] Tag out the equipment
  • [ ] Stop use of the sound level meter
  • [ ] Notify the responsible personnel
  • [ ] Document the deviation
  • [ ] Trigger impact review process

As Left Verification

  • [ ] Conduct post-adjustment checks
  • [ ] Confirm all measurements are within acceptance limits

Documentation & Closure

  • [ ] Update equipment label
  • [ ] Attach calibration certificate
  • [ ] Obtain reviewer sign-off
  • [ ] Update next due date in logbook

Data Integrity (ALCOA+): Ensure all data recorded is Accurate, Legible, Contemporaneous, Original, and Attributable.

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Deviation Impact Assessment

Event Summary
Asset: Sound Level Meter
Date: [TBD]
Discovered By: [TBD]
Document References: [TBD]
As Found Results Summary: [TBD]

Immediate Containment Checklist

  • Stop use of the asset
  • Label/tag the asset as out of tolerance
  • Segregate impacted work

Define Impact Window

Last Known In-Tolerance Date Discovery Date
[TBD] [TBD]

Product/Batch/Test Impact Review

Batch/Study/Report ID Results Potentially Impacted Re-test/Re-weigh Decision
[TBD] [TBD] [TBD]

Data Integrity Review Prompts (ALCOA+)

  • Attributable: [TBD]
  • Legible: [TBD]
  • Contemporaneous: [TBD]
  • Original: [TBD]
  • Accurate: [TBD]
  • Complete: [TBD]
  • Consistent: [TBD]
  • Enduring: [TBD]
  • Available: [TBD]

Risk Assessment

Severity Probability Detectability Rationale Overall Risk
[TBD] [TBD] [TBD] [TBD] [TBD]

Investigation Summary

Root Cause: [TBD]

CAPA Plan

Action Owner Due Date Effectiveness Check
[TBD] [TBD] [TBD] [TBD]

QA Disposition

Release/Hold/Retest/Recall Triggers: [TBD]

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Calibration Certificate

Certificate No: [TBD]

Date: [TBD]

Next Due Date: [TBD]

Asset Details

Asset ID Equipment Name Equipment Type Dept Area Make/Model Serial No Location Parameter/Range/Units Acceptance Criteria
CAL-0260 Sound Level Meter Sound Level Meter Engineering Facility [TBD] [TBD] [TBD] Sound (30 – 130 dB) ±1 dB

Conditions

Environment: [TBD]

Reference Standards

Standard Name/ID Certificate No Due Date Traceability Statement
[TBD] [TBD] [TBD] Traceability to ISO17025

Results

As Found Results

Test Point Measured Value (dB) Pass/Fail
30 [TBD] [TBD]
50 [TBD] [TBD]
70 [TBD] [TBD]
100 [TBD] [TBD]
130 [TBD] [TBD]

As Left Results

Test Point Measured Value (dB) Pass/Fail
30 [TBD] [TBD]
50 [TBD] [TBD]
70 [TBD] [TBD]
100 [TBD] [TBD]
130 [TBD] [TBD]

Measurement Uncertainty Statement: [TBD]

Statement of Conformity: [Pass/Fail overall]

Remarks: [TBD]

Signatures

Performed by: ____________________ Date: ____________

Checked by: ______________________ Date: ____________

Approved by: _____________________ Date: ____________

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