What is the primary purpose of using reference standards in eddy current testing?

In eddy current testing, the primary purpose of using reference standards is to create a baseline for comparison. Reference standards are typically materials that have known properties and characteristics, including specific types of flaws or conditions. By employing these standards during testing, operators can establish what the expected signals will look like for various material attributes and defect configurations.

Creating a baseline allows for accurate diagnostics when assessing the condition of similar materials in the field or during manufacturing processes. When a test is performed on an item, the signals received can be compared against the reference standard signals to determine the presence and severity of flaws or anomalies in the material being tested. This comparative analysis is essential for making informed decisions about the integrity and safety of the inspected components.

While calibrating equipment is also a critical process in ensuring accurate measurements, it is a separate function from the use of reference standards. The roles of training personnel and reducing costs, while significant to the broader context of testing, do not directly relate to the primary function of comparison that reference standards provide.