Biaozhuo Calibration Standard Block Set for Pendulum Skid Resistance Tester (Conforming to JJG(Transportation) 053–2017)

Overview

The Biaozhuo Calibration Standard Block Set for Pendulum Skid Resistance Tester is a traceable, metrologically validated reference material system designed exclusively for the verification, calibration, and periodic performance assessment of pendulum-type skid resistance testers used in road surface safety evaluation. Engineered in strict accordance with JJG(Transportation) 053–2017 “Verification Regulation for Pendulum Skid Resistance Testers” — the national metrological verification regulation issued by the People’s Republic of China Ministry of Transport — this block set serves as a primary physical standard for initial verification, interim checks, and subsequent verifications of pendulum testers deployed in highway engineering laboratories, pavement quality control centers, and transportation infrastructure inspection agencies. Each block features a precisely engineered, wear-resistant ceramic or hardened steel friction surface with certified nominal British Pendulum Number (BPN) values, enabling quantitative assessment of instrument bias, repeatability, and long-term stability. The measurement principle relies on standardized dynamic pendulum impact: a calibrated rubber slider (standardized hardness and geometry per BS EN 13036-4 and ASTM E303) swings across the block surface under gravity; energy loss due to friction is converted into a dimensionless BPN value proportional to the coefficient of friction. This method directly supports compliance with international pavement safety standards including ISO 13473-2, EN 13036-4, and ASTM E303.

Key Features

• Two certified configurations available: 2-block set (for rapid functional verification) and 6-block set (for comprehensive linearity and range validation across low-, medium-, and high-friction domains)
• Each block manufactured from monolithic, thermally stable ceramic or case-hardened alloy steel, ensuring minimal thermal drift and long-term dimensional integrity
• Surface finish and rubber-slider interaction geometry conform to JJG(Transportation) 053–2017 requirements for contact area, roughness profile (Ra ≤ 0.8 µm), and edge chamfer tolerance
• Individually serialized and supplied with a metrological certificate indicating certified BPN value, expanded uncertainty (k=2), reference temperature (20 °C ± 2 °C), and date of calibration
• Robust anodized aluminum transport case with custom-cut foam inserts, providing shock absorption, humidity buffering, and ESD-safe storage during field deployment
• No maintenance required between calibrations; surface cleaning performed only with isopropyl alcohol and lint-free cloth per verification protocol

Sample Compatibility & Compliance

This calibration block set is compatible with all pendulum skid resistance testers compliant with JJG(Transportation) 053–2017, including but not limited to models from Pavetest, Humboldt, Troxler, and domestic Chinese manufacturers (e.g., Nanjing Soil Instrument, Wuhan Huatong). It satisfies mandatory verification requirements for Class I and Class II pendulum testers under China’s national road testing metrology framework. While primarily intended for use in domestic transportation laboratories, the block geometry and material properties are fully aligned with international harmonized specifications: surface hardness ≥ 60 HRC (ceramic variant) or ≥ 55 HRC (steel variant); nominal BPN range covers 20–80 BPN in discrete increments; maximum permissible deviation between tester reading and certified BPN is ±2.0 BPN — a threshold consistent with ISO/IEC 17025 accredited calibration intervals. The set supports GLP-compliant documentation workflows and is suitable for inclusion in audit-ready quality records per CNAS-CL01 and GB/T 27025 requirements.

Software & Data Management

Although the block set itself is a passive physical standard, its integration into laboratory data management systems follows established digital traceability protocols. Each block’s serial number links to a secure, timestamped calibration certificate hosted in Biaozhuo’s LIMS-accessible portal (accessible via customer login credentials). Laboratories may import certificate metadata—including certified BPN, uncertainty budget, and calibration date—into internal QA databases or electronic lab notebooks (ELN) using CSV or XML export. For users operating pendulum testers with digital output interfaces (RS-232/USB), the verification procedure defined in JJG(Transportation) 053–2017 mandates recording raw swing-angle data, calculated BPN, and deviation against certified values — all of which support 21 CFR Part 11–compliant audit trails when captured within validated software environments. No proprietary software is required; verification reports comply with ISO/IEC 17025 clause 7.8.2 for reporting of calibration results.

Applications

• Initial verification of newly commissioned pendulum testers prior to field deployment in highway construction projects
• Intermediate checks between scheduled calibrations to confirm instrument stability under routine operational stress
• Post-repair or post-maintenance validation following replacement of critical components (e.g., pivot bearing, slider assembly, or scale mechanism)
• Inter-laboratory comparison exercises among provincial transportation research institutes under MOC supervision
• Training and operator competency assessment for personnel performing JTG E60–2008 pavement skid resistance testing
• Supporting accreditation audits by CNAS, CMA, or provincial metrology institutes requiring documented traceability to national standards

FAQ

What is the recommended recalibration interval for these blocks?
Per JJG(Transportation) 053–2017, the calibration certificate remains valid for 12 months from the date of issue, provided the blocks are stored and handled per the included instructions and show no visible surface damage.
Can these blocks be used with non-Chinese pendulum testers (e.g., UK or US models)?
Yes — the physical dimensions, slider geometry, and BPN scale definition are harmonized with BS EN 13036-4 and ASTM E303; however, users must verify alignment of their instrument’s zero offset and scale factor before cross-standard application.
Is surface reconditioning or resurfacing permitted if a block becomes scratched?
No — mechanical alteration invalidates the certified BPN value. Damaged blocks must be replaced and recertified as a new unit.
Does the set include a reference thermometer or hygrometer?
No — environmental monitoring equipment is not part of the calibration block set. Users must supply and validate separate temperature/humidity sensors meeting JJG(Transportation) 053–2017 ambient condition requirements (20 °C ± 2 °C, RH 50% ± 10%).
How is measurement uncertainty determined for each block?
Uncertainty is evaluated per GUM (JCGM 100:2008) using Type A (repeatability of reference measurements) and Type B (contributions from master standard, environmental effects, and operator influence) components, with k=2 coverage factor reported on the certificate.