make preparation for the test the workpiece; insert the probe plug into the computer's probe socket; power equipment; determine whether need to calibrate the instrument. If in the needs, choose the appropriate calibration method to calibrate; measurement. The vertical probe contacts the workpiece test surface and gently press the probe loading units, when the probe is in contact with the measured surface stability, with a loud beep, the screen will display the measurement identification and measurement. If the measurement is not identified or no flashing logo, it indicates that the measurement probe is unstable. After remove the probe, measuring identification disappear, thickness values ??remains. turn off the instrument. note! If the measuring head is placed instablely in the measurement, it will cause the measured value and the actual value have large deviation; if appropriate calibration has been carried out, all measured values ??will be kept within a certain range of error (see Appendix 1); according to statistics point of view, the once readings are not reliable. so any measured value of the instrument is five times; the unseen; the average value of the measurement. The five measurements are completed within a fraction of a second by the probe and instrument; to make measurements more accurate, multiple measurements at one point can be used, and calculate the average value as the final result of the measurement; after knowing the measurement results, be sure to lift the probe from the workpiece to 10mm or more, we can go for the next measurement.
the using method of coating thickness gauge when using the coating thickness gauge you should be complied with the provisions: a base metal properties of the magnetic method, the base metal magnetic of specification sheet and the surface roughness, and the test?specimen base metal magnetic should be similar to the base metal surface roughness. as for eddy current method, the electrical properties of the sheet specifications base metal should be similar to the electrical properties of the test?specimen base metal. b check the thickness of the base metal whether the base metal thickness exceeds the critical thickness, if not, it may be employed a method in 3.3 to calibrate. c edge effect should not be in close proximity to a mutation at the specimen, such as the edge of the hole and the inner corner, etc. were measured. d the curvature should not be measured on the test?specimen outer curvature surface. e the number of readings usually are not the same because each instrument readings is different, so it must take several readings within each measurement area. Local differences in the thickness of the cover layer is also required in any given area of ??multiple measurements, and when the surface is roughness the result is the same. f before the appearance of cleanliness measurement, you should remove any adhering substance on the surface, such as dust, grease and corrosion products, etc., but do not remove any cover layer material.
This instrument is widely used in manufacturing, metal processing industry, chemical industry, commodity inspection and other testing fields. it is the necessary equipment for the material protection. Magnetic measuring mechanism method, when the probe is in contact with the cladding, the probe and the magnetic metal substrates constituting a closed magnetic circuit, due to the presence of a non-magnetic coating, the magnetic resistance changes, by measuring the amount of change we can obtain the thickness of the coating.
It is using laser reflection mechanism, using the geometry of the measured thickness of the product according to microscopic observation and measurement of light cutting machinery manufacturing parts processing surfaceand it is a non-contact dynamic measurement instruments. It can directly output digital signal which is connected to the industry computer, and quickly process the data and outputs the offset value to a variety of industrial equipment.
