Calibration & Testing

General Testing and Calibration of Weighbridge

1. Visual & Mechanical Inspection

• Inspection of weighbridge platform for any physical damage, corrosion, or obstruction.
• Checking platform leveling, alignment, and free movement.
• Examination of load cell mounting assemblies, check rods, bearings, and stopper bolts.
• Verification that no foreign material is restricting platform movement.

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2. Electrical & System Checks

• Inspection of load cell cables, junction boxes, glands, and connectors for damage or moisture ingress.
• Checking earthing and grounding continuity.
• Verification of power supply stability and protection devices.
• Functional check of weighing indicator, display units, printer, and peripherals.

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3. Zero Setting & Stability Test

• Ensuring the weighbridge returns to true zero with an empty platform.
• Observation of zero stability over a defined time period.
• Adjustment of zero if required as per manufacturer guidelines.

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4. Corner (Eccentric Load) Test

• Placement of standard test weights at different corners of the platform.
• Verification of uniform response at all corners.
• Identification and correction of any corner imbalance.

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5. Span / Linearity Test

• Application of test weights in incremental steps across the weighing range.
• Checking accuracy at multiple load points (e.g., 25%, 50%, 75%, and 100% of capacity).
• Confirmation of linear response and permissible error limits as per applicable standards.

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6. Repeatability Test

• Repeated loading and unloading of the same test weight.
• Verification that readings are consistent within permissible tolerance.

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7. Calibration Adjustment

• Calibration of the weighing system using certified standard weights or equivalent test methods.
• Adjustment of span and linearity values in the indicator as required.
• Locking and sealing of calibration parameters after completion.

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8. Simulation & Functional Tests

• Simulation of load cell signals to verify indicator response.
• Checking overload indication, error messages, and alarm functions (if provided).

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9. Legal Metrology Compliance Check

• Verification of compliance with Legal Metrology Rules applicable to weighbridges.
• Preparation of weighbridge for statutory stamping / verification.
• Assistance during inspection by Legal Metrology authorities.

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10. Documentation & Certification

• Recording of test results and calibration data.
• Submission of calibration and testing report.
• Tagging / labeling of calibration status where applicable.