User Manual

16
immediately. The final reading derives from the statistica l calculation and from the guaranteed tolerance levels
of the gauge. T(coating thickness)=M(mean value)±S(standard deviation)±A(measuring accuracy).
3. Factors of Affecting Measurement Accuracy
User needs to know the factors of affecting measurement accuracy before using the gauge. The factors are
listed as below.
Factors
Principle
Magnetic
Eddy Current
Reco m m end ations
Magnetic properties
√
Need to calibrate
Elect rical properties
√
Need to calibrate
Curvature radius
√
√
Reference the chapter 1.6, and need to calibrate
Substrate thickn ess
√
√
Reference the chapter 1.6, and need to calibrate
Size of measuring area
√
√
Reference the chapter 1.6, and need to calibrate
Surface roug hness
√
√
Position and shape
√
√
Sample defor med
√
√
Avoid to measure on too soft or too thin material
Adhesive sub stances
√
√
Clean probe and sample
Strong magnet ic field
√
Be away from strong magnetic field
Temperature and humid ity
√
√
Recalibrate at the same environment conditions
Measuring op erations
√
√
Read the chapter 2.2
Low battery
√
√
Replace the battery
Probe wear
√
√
Consult with suppler