Reference Block Type 1 EN ISO 9934-2

1. Verify the magnetization effect (magnetic field direction and intensity)

MTU-3 test blocks are usually made of materials with high magnetic permeability, When the test block is placed on the surface of the inspected workpiece and magnetized together with the workpiece, The operator determines the direction of the magnetic field on the surface of the workpiece by observing which directions of defects display magnetic traces. For example, if only radial cracks are visible, it indicates that the magnetic field is circumferential; If only concentric cracks are displayed, it indicates that the magnetic field is radial.

2. Evaluate the comprehensive sensitivity of the system

The artificial defects on the test block are very subtle and can only be clearly displayed when the entire detection system (current value, magnetization method, magnetic suspension concentration, cleanliness, lighting conditions, etc.) is in good condition.

3. Daily performance verification

·Before starting the testing work every day, or after replacing the testing process and equipment, using MTU-3 test blocks for a quick calibration is an important quality control step to ensure the reliability of the testing results. This meets the regulatory requirements of high standard industries such as aerospace, nuclear power, and pressure equipment.

4. Compare the performance of different magnetic suspensions

·By using the same MTU-3 test block and the same magnetization specification, the performance of magnetic suspensions (including fluorescent and non fluorescent) from different batches or suppliers can be compared. A better performing magnetic suspension will result in clearer defect display and higher contrast on the test block.