What is an eddy current thickness gauge:
The eddy current thickness gauge is a small instrument that uses the eddy current measurement principle to conveniently and non-destructively measure the thickness of paint, plastic, rubber and other coatings on non-ferrous metal substrates, or the thickness of anodized films on aluminum substrates. This instrument is widely used in machinery, automobiles, shipbuilding, petroleum, chemical industry, electroplating, plastic spraying, enamel, plastics and other industries.
The principle of eddy current measurement is that high-frequency AC signals generate electromagnetic fields in the probe coil. When the probe is close to the conductor, eddy currents are formed in it. The closer the probe is to the conductive substrate, the greater the eddy current and the greater the reflected impedance. Like the magnetic induction thickness gauge, the eddy current thickness gauge also reaches a high level of resolution of 0.1um, allowable error of 1%, and measuring range of 10mm. Thickness gauges that use the eddy current principle can, in principle, measure non-conductive coatings on all conductive bodies, such as paint, plastic coatings on the surface of aerospace aircraft, vehicles, home appliances, aluminum alloy doors and windows, and other aluminum products. Anodized film. The cladding material has a certain conductivity, which can also be measured through calibration, but the ratio of the conductivities between the two is required to be at least 3-5 times different (such as chromium plating on copper). Although the steel matrix is also a conductor, it is more appropriate to use magnetic principle measurement for this type of task.
Measurement notes:
1. In order to reduce the impact of the material of the measuring body on the measurement accuracy. It is recommended to use an uncoated measuring body or a standard test block made of the same material as the measuring body as the reference block for calibration.
2. After the measurement is completed, lightly press the power button to turn off the power of the whole machine, and apply a little grease on the contacts of the measuring head and the reference block to prevent rust.
3. This instrument has an automatic shutdown function. If no operation is performed, it will automatically shut down after about one minute.
4. The instrument should be protected from severe vibration and impact. After use, the surface of the instrument should be wiped clean of oil and dirt and placed in the instrument box for proper storage.
5. It is strictly forbidden to knock or collide with the probe to avoid affecting the performance of the probe; it is strictly forbidden to pinch the tail of the probe for measurement.
