Probe Frequency (4)

Question 1

Factors that impact the selection of a frequency for an EC inspection: (4)

Answer 1

• probe coil characteristics
• test material characteristics
• type of inspection
• inspection sensitivity requirements

Question 2

Frequency formula (plate)

Answer 2

F = 1.6p/t²

F = frequency (KHz)
p = plate resistivity (ohm)
t = plate thickness (mm)

Question 3

Frequency formula (tube)

Answer 3

F90 = 3p/t²

F90 = frequency (KHz)
p = tube resistivity (ohm)
t = tube wall thickness (mm)