A: For standard laboratory use (10–20 hours per week), we recommend annual calibration. For high-volume production testing (8+ hours daily) or third-party testing labs operating under ISO/IEC 17025 accreditation, calibrate every 6 months. This aligns with the verification intervals suggested by BIFMA, EN, and ASTM standards, which require that force and displacement measurement systems remain within specified tolerance bands.

Key components requiring periodic calibration include load cells (verify against ISO 7500-1 Class 0.5 or Class 1 reference standards), displacement transducers and laser sensors (the DR-J503 mattress tester uses Panasonic laser displacement sensors with ±1 mm accuracy), and servo motor encoders. We also recommend an intermediate functional check every 3 months — run a known reference sample or calibration block through a standard test cycle and verify the force-displacement curve matches historical data. This catches drift early without requiring full recertification.

After any major maintenance (load cell replacement, servo drive repair, software update), perform an immediate single-point verification before resuming production testing. Derui provides remote calibration guidance for all DR-J series machines, including step-by-step verification procedures and reference load checklists specific to each standard you’re testing against.