The main faults of coating thickness gauge in nondestructive testing include unstable value display, large error, no value display, etc.The causes of these failures are from the instrument itself, from the measured workpiece, as well as from the natural environment. Here are the methods to troubleshoot these failures.
Troubleshooting method of coating thickness gauge
1. Display value is not stable
The cause of the instability of the coating thickness gauge is mainly due to the particularity of the material and structure of the workpiece itself, such as whether the workpiece itself is a magnetic conductive material. If it is a magnetic conductive material, we have to choose the magnetic coating thickness gauge. If the workpiece is conductive, we have to choose the eddy current coating thickness gauge.There are workpiece surface roughness and attachment is also the cause of the instrument value display temperature, workpiece surface roughness is too large, surface attachment too much.The key to troubleshooting is to grind the workpiece with large roughness, go out to the attachment, and then choose the appropriate coating thickness tester.
2. There are too many errors in measurement results
The reasons for the large measurement error of the coating thickness gauge have been introduced clearly in the previous articles. Here we briefly introduce the main reasons for the large measurement error:Matrix metal magnetization, matrix metal thickness is too small, edge effect, workpiece curvature is too small, surface roughness is too large, magnetic field interference probe placement method, new friends can refer to the instrument article familiar with we will not do a introduction.
3. Don’t display numbers
The simple reason why the coating thickness gauge does not display a number is to check whether the battery is sufficiently charged. If the battery is sufficiently charged, the measurement still does not display the value.