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can be deleted immediately. The final reading derives from the statistical calculation and from
the guaranteed tolerance levels of the instrument. T (coating thickness) = M (mean value) ± S
(standard deviation) ± A (measuring accuracy)
5.2 Factors affecting accuracy
There are some factors which might affect the measurement’s accuracy. These factors are listed
as below;
Factor/principal Magnetic
Eddy
Recommendations
current
Magnetic samples
Calibration
needed
Electrical samples
Calibration
needed
Curvature radius
Please read paragraph 1.1 + calibration needed
Substrate thickness
Please read paragraph 1.1 + calibration needed
Size of measuring area
Please read paragraph 1.1 + calibration needed
Surface roughness
Position and shape
Sample deformation
Avoid measuring on too soft or too thin materials
Adhesive substances
Clean probe and sample
Strong magnetic fields
Keep away from strong magnetic fields
Temperature & Humidity
Re-calibrate at the same environment conditions
Measuring operations
Please read paragraph 5.1.2.
Low batteries
Please replace the batteries
Probe wear
Please contact supplier
The measured sample must have the same conditions as the calibration sample (material proper-
ties, curvature radius) The more closely the measured sample matches the calibration sample, the
more accurate the readings will be. In addition, curvature radius should meet the minimum value
as specified in paragraph 1.2.
The minimum substrate thickness and the minimum measuring area as specified in chapter 1.2
should be taken into account. The instrument needs to be re-calibrated (Zero/Multi-point) if
measuring various samples for higher accuracy.
To achieve high-accuracy readings, it is advisable to log calibration values several times. In this
way, the instrument will automatically establish a mean calibration value. The high-accuracy
calibration is an obvious advantage when calibrating uneven and rough surfaces.
EN
