Non-Destructive Testing (NDT) Practice Test

What is typically required for the calibration of eddy current inspection equipment?

1. Regular visual checks

2. A custom calibration procedure

3. Calibration to a reference standard

4. Calibration by the user only

The correct answer is: Calibration to a reference standard

Calibration of eddy current inspection equipment typically requires calibration to a reference standard. This is essential because using a reference standard ensures that the equipment is providing accurate and reliable measurements. A reference standard involves known properties that can be used to compare and adjust the performance of the inspection equipment, ensuring that it operates within specified tolerances. This process validates the sensitivity and accuracy of the system, allowing for effective detection of flaws or material properties in the items being inspected. Establishing a baseline with a reference standard also allows for consistency across different inspection sessions and operators, leading to standardized results. Without calibration to a reference standard, there is a risk of misleading data, which can compromise the integrity of the NDT process. Other methods such as regular visual checks or user-only calibration may not provide the level of accuracy necessary for precise measurements required in eddy current testing. A custom calibration procedure could be helpful in some cases, but the fundamental necessity lies in the comparison with established reference standards for meaningful calibration.