Extensometer & LVDT Calibration

Extensometer & LVDT Calibration
(ISO 9513 / ISO 13225 — Displacement Calibration)

NABL-accredited calibration of extensometers and LVDTs per ISO 9513 — verifying linearity, repeatability, zero offset and hysteresis for tensile testing and structural monitoring applications.

Overview

What is the Extensometer & LVDT Calibration?

Extensometers and LVDTs are precision displacement transducers measuring strain and linear displacement. ISO 9513 classifies extensometers by accuracy class (0.2 to 2). LVDTs are calibrated per ISO 13225 using reference slip gauges.

At Global Lab, extensometer calibration per ISO 9513 uses a calibrated micrometer screw as reference — verifying gauge length, linearity error, zero offset and hysteresis. LVDT calibration per ISO 13225 verifies voltage vs displacement linearity using NPL-traceable reference. ISO 9513 class is assigned from measured errors.

Non-Destructive

Minimal surface preparation. Structure integrity is preserved throughout testing.

Fast Turnaround

On-site results within hours. Digital reports dispatched within 24 hours.

NABL Certified

All test and calibration results are backed by traceable measurements and standardized procedures.

Pan-India Coverage

Site engineers deployed across 7 lab locations and all major project sites.

Digital Reporting

Access reports anytime via Autovity QLMS client dashboard — zero paperwork.

High Accuracy

Results correlated to cube compressive strength with ±2% precision range.

Test in Action

Extensometer & LVDT Calibration — Site Images

Extensometer on Calibrated Micrometer Reference — ISO 9513

LVDT Voltage vs Displacement Linearity Plot

ISO 9513 Class Designation from Measured Errors

Test Procedure

How the Extensometer & LVDT Calibration is Conducted

1

Surface Preparation

A shallow groove (approx. 25mm deep) is cut into the concrete surface using a diamond-tipped cutting tool. The surface is cleaned of dust and debris.
2

Insert Disc Placement

A specially designed steel insert disc is placed into the groove. A thin rod connects the disc to the pullout apparatus above the surface.
3

Hydraulic Pullout Force Application

A hydraulic jack applies a steady, controlled pullout force to the insert disc via the reaction ring resting on the concrete surface.
4

Failure Load Recording

The maximum force at which the concrete cone is extracted is recorded. A digital load indicator provides real-time readings with data logging.
5

Strength Calculation & Reporting

The pullout force is correlated to cube compressive strength using established calibration curves. NABL-accredited reports are issued via Autovity QLMS.

Standards & Specifications

Applicable Test Standards

Standard	Title	Scope	Type
ISO 9513	Metallic Materials — Calibration of Extensometers	Extensometer	ISO
ISO 13225	Dimensional Metrology — Local Calibration of Contact Instruments	LVDT	ISO
IS 1317	Methods of Test for Length Measuring Instruments	Dimensional Reference	Indian Standard
NABL-141	NABL Policy on Metrological Traceability	Traceability	NABL

Applications

Where is the Extensometer & LVDT Calibration Used?

UTM extensometer calibration for Young's modulus and yield strength testing

SHM LVDT calibration for deflection and settlement monitoring

Concrete creep LVDT calibration

Servo-hydraulic test frame LVDT position feedback calibration

Triaxial LVDT calibration for soil consolidation

Pre-NABL extensometer calibration for lab scope

Why Choose Global Lab

Our Advantages

NABL Accredited CertificatesISO 9513 class certificates for NABL lab assessment.

Class Designation IssuedISO 9513 class assigned — directly referenced in test reports.

Gauge Length CertifiedKnife-edge gauge length certified alongside electrical output.

Fast 2-Day CertificateNABL certificate within 2 working days.

Pan-India CoverageDimensional calibration teams at all 7 locations.

On-Site or LabExtensometers at our lab; LVDTs on-site if required.

Extensometer & LVDT Calibration(ISO 9513 / ISO 13225 — Displacement Calibration)