Precautions for PCB image measuring instrument

With the progress of science and the development of society, our requirements for products are getting higher and higher, from coarse to fine, from centimeters to millimeters. This is undoubtedly the pursuit of product quality, and it has also promoted the widespread application of image measuring instruments. In all walks of life. Applicable to all fields and two fields. These fields are related to size measurement, medical equipment, molds, hardware, plastics, electronic components and other industrial applications. Let us look at its application on PCB today.

In the original PCB boards, image measuring instruments are more used for the external dimensions of the PCB boards. Nowadays, with the increasing demand of customers for electrical, the appearance requirements of PCBs are getting higher and higher. Of course, the form and position tolerances are becoming more and more strict, which promotes the use of images. Sometimes it is necessary to use a three-coordinate measuring instrument, but the current image measuring instrument is better developed, not only can meet the following requirements: the customer's two-dimensional size measurement, but also can meet the customer's three-dimensional size measurement. The main measurement of PCB is the external length and width dimensions, the distance between each dimension and the edge of the board, the line width, the arc, the thickness of the board and the size of the hole. Since the PCB is easily oxidized after copper plating, incorrect grasping will occur when measuring with the second element. Therefore, before measuring, we must ensure the integrity of the PCB to be measured, otherwise the measurement will be inaccurate and affect the measurement result. In addition, some edges in the PCB are very short. If you use a smaller magnification to capture, the actual value captured may be inaccurate. At this point, we need to select the magnification of the measuring instrument to obtain an accurate true value. The other is that during the measurement, we tried to use a low-angle ring light to get a clearer boundary.