Universal tensile testing machines perform tension, peeling, bending and compression tests for plastics, films, metals, packaging and other materials. Long-term frequent operation often causes data drift, inaccurate force readings, poor repeatability and peak deviation, leading to wrong quality assessment, invalid reports and audit failures. Such precision issues are mostly caused by improper sensor use, insufficient calibration and non-standard maintenance, rather than hardware faults.
Based on ISO, ASTM and GB/T standards, this guide delivers streamlined calibration, sensor protection, troubleshooting and maintenance solutions. It helps global labs and manufacturers stabilize test accuracy, reduce downtime and meet international certification requirements.
1. Main Causes of Data Inaccuracy & Drift
Data inaccuracy and drift mainly stem from sensor overload/fatigue, eccentric sample loading, ambient temperature & humidity changes, dust/oil contamination, missing regular calibration and worn slippery fixtures. Over-range testing causes permanent sensor micro-deformation, while incorrect clamping undermines test repeatability.
2. Daily Sensor Protection Guidelines
High-precision load cells are vulnerable to overload, impact, eccentricity and moisture. Avoid over-range testing, violent sample fracture impact, inclined or unilateral loading. Do not operate in dusty, humid or corrosive environments. Never knock or squeeze sensors. Release static stress regularly to prevent elastic fatigue.
3. Standard Calibration Procedures
Adopt a three-tier calibration system: daily inspection, quarterly calibration and annual third-party calibration. For daily checks, preheat the machine for 15–20 minutes, hang standard weights on the sensor center and verify readings. Recalibrate immediately if errors exceed ±0.5% and conduct multi-point verification for linear accuracy.
Annual calibration complies with ASTM E4 and ISO 7500-1 to verify indication error, repeatability and linear deviation, providing valid certificates for factory audits and international certification.
4. Fixture & Transmission System Maintenance
Clean and replace worn fixtures regularly to prevent sample slipping and data distortion. Clean slide rails and lead screws weekly and apply special lubricant to ensure smooth transmission. Avoid low-grade oil to prevent carbon deposition and data jitter. Routinely check transmission parts to eliminate mechanical looseness and data drift.
5. Long-Term Shutdown, Storage & Reuse Rules
For long-term storage, fully clean the equipment, center the crossbeam to release sensor stress, and apply anti-rust treatment on metal parts. Power off and cover with a dust cover, keeping the lab dry and ventilated. Before reuse, preheat the machine, run no-load tests and recalibrate precision for stable operation.
6. Quick Troubleshooting for Abnormal Test Data
For data fluctuation and poor repeatability, troubleshoot in order: check firm and centered sample clamping; inspect fixture condition and cleanliness; confirm rail lubrication and parameter matching; check sensors for dust, moisture and overload damage; reset and recalibrate the system. Most common issues can be fixed on-site.
7. Standard Practices for Long-Term Testing Precision
Long-term precise testing requires standardized operations: preheat and calibrate before use; select matched sensor ranges; ensure vertical, centered clamping; clean equipment after testing; perform regular inspection and calibration; follow international standards for parameter setting; keep traceable maintenance records.
Conclusion
Stable test accuracy is critical for export quality control and global certification. Standard calibration and daily maintenance effectively avoid data errors and audit risks. Our tensile testing machines comply with ISO, ASTM and GB global standards. We offer professional maintenance guidance, remote calibration and compliance consulting, helping customers stabilize product quality and pass international certifications efficiently.
Post time: Jul-17-2026