Force Calibration

Whether you need to measure 1 gram force (0.01 N) or 1,000,000 pounds force (5 MN) Instron can calibrate your testing machine or instrument. This can be carried out in one of our Force Calibration Laboratories or by one of our field calibration staff visiting your premises to undertake the calibration on-site. Instron's range of capability reflects our commitment to be the leading force calibration service in the industry. As the first materials testing company to use strain gauge load cell technology and as the leader in providing high accuracy instruments, we take pride in our knowledge of force measurement and calibrations of the highest quality.

We perform calibrations and verifications to internationally recognized standard methods including ASTM E74 and ISO 376 for calibration devices (standards), and ASTM E4 and ISO 7500-1 for verification of force on testing machines. Instron can also provide calibrations to specific national standards where requested.

The Instron Difference

Instron® not only meets internationally accepted force calibration standards, but we routinely exceed them. All our calibration certificates provide comprehensive uncertainty of measurement data meeting the demanding needs of testing laboratories requiring full compliance to ISO/IEC 17025. Our calibrations usually cover a much wider force range than other calibration providers so that you can use your system confidently down to lower forces.

High-Capacity Deadweight Stack

The largest deadweight stack in North America outside of the National Institute of Standards and Technology (NIST) is maintained at Instron's corporate headquarters. This allows us to directly calibrate our field working standards to high accuracy level.

Equipment Calibrated

Materials testing machines and instruments of all types, production equipment with force or weight transducers, hand held pull/push testers, hardness, structural testing rigs, simulators, mechanical, electromechanical or hydraulic drives.

Equipment Brands

Instron, Satec™, Dynatup®, Wilson® Instruments, Wolpert™, Schenk®, MTS®, Instron IST, Tinius Olsen, Zwick, United, Lloyds Instruments, Mayes, Dennison, Shimadzu®, Rhiele, Baldwin®, ATS and more.

Materials Testing Force Verification Standards

There are two internationally recognized standard methods for verifying the force measuring capability of a materials testing machine or instrument. One is published by American Society for Testing and Materials (ASTM) and is titled ASTM E 4. The other is an ISO document, ISO7500-1. Both of these similar standards have been developed over many years, and are technically rigorous. If followed, they ensure that the force measuring system of your testing instrument is accurate under static or quasi-static conditions. ASTM E 4 specifies that the testing machine be accurate to 1% of reading over the verified range. This is very different from 1% of full-scale, which is how some suppliers spec their product. ISO 7500-1 defines several accuracy classes, ranging from 0.5 to 3. Most materials testing machines are calibrated to Class 1, which is equivalent to the ASTM E 4 requirement of 1.0%.

Which Force Verification Standard Should Be Used?

For the majority of customers, verifying equipment to either of the major standards (ISO7500-1 or ASTM E 4) is a low-risk way to assure that the calibration of force transducers is done properly, and the probability that the instrument will provide bad data is minimal. These standards provide a reasonable balance between the difficulty (and cost) of performing the verification and the quality of the results. Accepted practice is to verify systems in North America to ASTM E 4 and systems in Europe to ISO 7500-1. Other regions vary based on local requirements. Ultimately, the choice is yours, and Instron can calibrate to either standard to meet your needs.