Proficiency Testing — Compression Testing Machine(Interlaboratory Comparison — Force Calibration)
ISO/IEC 17043-aligned proficiency testing scheme for compression testing machine (CTM) calibration — circulated reference artefacts, ISO 13528 statistical evaluation (En / z-scores), and confidential performance reports for NABL-accredited and aspiring calibration laboratories.
What is the Proficiency Testing — Compression Testing Machine Scheme?
Under ISO/IEC 17025:2017 (clause 7.7), every accredited calibration laboratory must monitor the validity of its results by participating in proficiency testing (PT) — and NABL expects documented, satisfactory PT participation across the accredited scope. Global Lab operates an ISO/IEC 17043:2023-aligned interlaboratory comparison scheme for compression testing machine (CTM) calibration: a characterised artefact travels between participating labs, each calibrates it by their normal method, and results are evaluated statistically against the assigned reference value.
CTMs anchor the cube-strength economy of Indian construction — interlaboratory agreement on CTM force is what keeps one lab's 25 MPa equal to another's. The scheme measurand covers compressive force calibration of CTMs against proving devices, with results reported at standard force steps spanning the common cube-testing ranges. Each participant receives a confidential performance report — En numbers and z-scores per ISO 13528 — through our Live PT Program portal, with anonymised group statistics and corrective-action guidance where performance flags arise.
How the Proficiency Testing — Compression Testing Machine is Conducted
- 1
Enrolment
The laboratory enrols for the compression testing machine (CTM) scheme round through the Live PT Program portal and receives the scheme protocol. - 2
Artefact Receipt
The characterised artefact arrives per the circulation schedule with handling instructions and condition-check requirements. - 3
Calibration by Your Method
Your lab calibrates the circulated proving device (or its CTM, per protocol) by its normal IS 1828-based method and reports forces with uncertainties. - 4
Result Submission
Results with claimed uncertainties are submitted through the portal by the round deadline. - 5
Statistical Evaluation
Submissions are evaluated against the assigned value per ISO 13528 — En numbers and z-scores computed per measurement point. - 6
Performance Report
A confidential report with your performance flags and anonymised group statistics is issued; corrective-action guidance follows any unsatisfactory result.
Applicable Test Standards
| Standard | Title | Scope | Type |
|---|---|---|---|
| ISO/IEC 17043:2023 | Conformity Assessment — General Requirements for the Competence of Proficiency Testing Providers | PT Scheme Operation | International |
| ISO 13528:2022 | Statistical Methods for Use in Proficiency Testing by Interlaboratory Comparison | En / z-Score Evaluation | International |
| ISO/IEC 17025:2017 | Competence of Testing and Calibration Laboratories (Clause 7.7) | Participation Requirement | International |
| IS 1828 (Pt 1) | Verification of Static Uniaxial Testing Machines — Force Measuring System | Calibration Method Context | Method Standard |