New Coating Thickness Gauge Technology
1 Zero adjustment, that is, zero adjustment on a specific zero board, or zero adjustment on the original substrate that needs to be measured;
2. According to the different measurement ranges of the measurement products, use the appropriate test piece to adjust the value to reduce the measurement error.
Under normal circumstances, there is no problem with this method when the instrument is newly purchased and used, but it is more cumbersome.
But when the probe was used for a period of time, the problem came out. During operation, the measurement accuracy of our instruments is greatly reduced.
It's hard to grasp. The reason lies in the principle of the product, which is a fatal flaw, that is, the probe uses a magnet to wind the coil.
A magnetic field is generated when an electric current is applied, and this magnetic field is irregular.
Fortunately, there is a new type of coating thickness gauge, the FT200 coating thickness gauge, which uses the latest magnetic sensing technology.
This is what we know as the Hall effect, discovered by Hall in 1879. By studying the relationship between the Hall voltage and the working current, measuring the magnetic field and permeability of the electromagnet, and studying the relationship between the Hall voltage and the magnetic field, Hall found that the potential difference U H is proportional to the current intensity I H and is proportional to the magnetic induction B. It is inversely proportional to the thickness d of the sheet.
This magnetic field becomes regular. When this principle is applied to the coating thickness gauge, there is no need to adjust the test piece. Especially when measuring arc or concave products, it is easier and more convenient to use.
