Calibration of Frame Stiffness and Area Function

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Introduction

The Keysight Technologies, Inc. G200 NanoIndenter performs a specific kind of mechanical test known as instrumented indentation. Instrumented indentation testing (IIT) involves pressing a hard indenter of known shape and elastic properties into a test material while continuously measuring both force and displacement. Mechanical properties, including Young’s modulus and hardness, are derived from these fundamental measurements. Because IIT naturally lends itself to evaluating materials on the scale of nanometers, it is also commonly known as “nanoindentation”.

A number of calibration processes are required in order to bring an instrumented indentation system online. For example, the mechanism for sensing the motion of the indenter must be calibrated by associating the output of the sensor with known dimensions (we use laser interferometry for this task). Most of these calibrations are performed at the factory and are transparent to the user. However, two calibrations deserve special attention. They are the “frame-stiffness” and “area-function” calibrations.

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