EN ISO 7500-1:2018 PDF

Overview

EN ISO 7500-1:2018 - "Metallic materials - Calibration and verification of static uniaxial testing machines - Part 1: Tension/compression testing machines - Calibration and verification of the force‑measuring system" is the CEN-adopted version of ISO 7500-1:2018. The standard specifies procedures for the calibration and verification of the force‑measuring system used in static tension and compression testing machines. It covers a general inspection, force‑measuring system calibration and the confirmation that a testing machine meets the performance limits for a specified class.

Note: EN ISO 7500-1:2018 addresses static calibration only - calibration results are not guaranteed for high‑speed or dynamic testing.

Key topics and requirements

• General inspection of the testing machine and force-application accessories (see Annex A).
• Calibration of the force‑measuring system using force‑proving instruments; establishes relationship between machine-indicated force and reference force (see ISO 376 as normative reference).
• Determination of resolution and variation of readings for analogue and digital force indicators.
• Alignment, temperature compensation and conditioning of the testing machine and force‑proving instrument before measurement.
• Calibration procedure: application of discrete forces, verification of accessories, piston-position effects, and reversibility/error estimation.
• Performance assessment metrics: relative indication error, relative repeatability error, agreement between instruments, and uncertainty estimation (informative Annex C).
• Classification and acceptance: confirmation that the machine achieves limits for a specified class and generation of a verification report with results and intervals between verifications.
• Safety caution: some tests can create hazardous situations; appropriate safeguards are required.

Practical applications and users

Who uses EN ISO 7500-1:2018:

• Calibration and metrology laboratories performing force calibrations.
• Mechanical testing laboratories conducting tensile and compression tests on metals.
• Manufacturers and maintainers of uniaxial testing machines who need type verification or factory calibration.
• Quality managers, materials engineers and conformity assessment bodies requiring traceable force measurement for material certification, R&D, and production quality control.

Practical benefits:

• Ensures traceable, repeatable force measurements for static material tests.
• Provides a standardized basis for comparing testing machines and meeting accreditation requirements.
• Helps manage measurement uncertainty, repeatability and machine classification.

Related standards

• ISO 376 - Calibration of force‑proving instruments used for verification of uniaxial testing machines (normative reference).
• Other parts of the ISO 7500 series (see ISO catalogue) for related procedures and machine types.

Keywords: EN ISO 7500-1:2018, calibration, verification, tension/compression testing machines, force‑measuring system, static calibration, force‑proving instrument, ISO 376, testing machine class.