Question

Since eddy current signals are affected by many different variables, it is particularly important to use what when setting up the equipment?

Answer 1

Since eddy current signals are affected by many different variables, it is particularly important to use reference standards when setting up the equipment.

Explanation:

• While setting equipment, it is always important to check the reference standard because even small alter will drastically change in the appearance of the signal.
• The signals obtained as the result of the non-destructive testing conducted on the object should be compared with the signals in the reference standards. If the signals are different, then the object should be further investigated.
• The reference standard should have same material, electrical field and magnetic permeability.
• The cracks and notches from electron discharge machining are used as cracks in reference standard.