It is very accurate. First, pressing the zero botton of the gauge and putting the probe on the basic board. Picking up the probe after the equipment has readed the number. Instrument then has returned to zero. Usually several standard test pieces will be attached after purchased. There is standard thickness value marked on the test piece. When detecting the equipment, you can put the test pieces on the base material and check whether the normal measurement and numbers on the test piece is consistent.
Errors are inevitable. We can just try our best to avoid it. Here are some factors that affect the accuracy. a. magnetic properties of a base metal The thickness guage using magnetism method to measure the thickness will be affected by magnetic variation of base metal (in practical applications, low carbon steel magnetic changes can be considered to be minor). In order to avoid the effect of heat treatment and cold processing, a standard sheet that has the same property with the base metal can be used to adjust the instrument. Test specimen to be coated can also be used to adjust the equipement. b. conductivity electrical properties. The conductivity of the base metal will affact the measurement and is relatedt to the its materials and heat treatment methods. a standard sheet that has the same property with the base metal can be used to adjust the instrument.
First, pressing the zero botton of the gauge and putting the probe on the basic board. Picking up the probe after the equipment has readed the number. Instrument then has returned to zero. Usually several standard test pieces will be attached after purchased. There is standard thickness value marked on the test piece. When detecting the equipment, you can put the test pieces on the base material and check whether the normal measurement and numbers on the test piece is consistent.
Under normal circumstances it is relatively accurate. It may be inaccurate under special occations. After all, every product has its particularity. The thickness gauge is used to measure the thickness of materials and objects. It is usually used to measure the thickness of the products (such as plate, strip, film, paper and metal foil) in industrial production. There is radioactive thickness gauge that takes advantages of the α-rays, β-rays, γ-rays; ultrasonic thickness gauge that takes advantages of the ultrasonic frequency changes; eddy current thickness meter that takes advantages of the vortex principle; thickness gauge that takes advantages of the principle of mechanical contact measurement.
The question is not whether the thickness gauge precise or not, but how precise you are required. The portable thickness gauge generally is not very precise. After all, the film is only tens of micrometers thick. The repeatability and reproducibility of the gauge is also not good. The Non-destructive gauge is generally not precise as destructive one.
