During SMT processing, plug holes are required, which have five main functions:1. Prevent short circuit caused by tin penetrating through the component surface from the passthrough hole during wave soldering of PCB; 2. Avoid flux residue in the pass hole.
The milling technology of circuit board CNC milling machine includes the selection of cutting direction, compensation method, positioning method, frame structure, the next cutter point, which is an important aspect to ensure the milling precision.
No cleaning means that the residues of PCB circuit boards are safe from the chemical point of view, will not have any impact on the production line of PCB circuit boards, and can be left on PCB circuit boards
So what are the factors that affect the price of a PCB board? 1, PCB material difference, 2, surface treatment process difference, 3, PCB itself difficulty difference, 4, copper foil thickness difference, 5, customer quality acceptance standard difference
Analysis of PCB deformation causes :1. The uneven area of the copper plane on the circuit board will aggravate the bending and warping of the circuit board. 2. The weight of the PCB board itself may also cause the board to sag and deform.
PCB color has no direct relationship with its performance, because the different color will not affect the performance of the circuit board. Black is the most prone to chromatic aberration, and the lines on black PCBS are difficult to read.
Over-protection of the product can allow it to survive the harshest environmental conditions, but the "harshest environment" may be temporary or transient, so a resin solution with lower performance in the higher temperature range is usually suf...
Traditionally, we define PCB boards with more than 4 layers as "multilayer PCB boards", and more than 10 layers as "high multilayer PCB boards".
It is easy to determine that the IC is damaged. These changes are not necessarily caused by the IC damage, nor do they necessarily indicate that the IC is good. Because some soft faults do not cause a change in DC voltage.
In order to meet customer requirements, the circuit board must plug holes through the hole, after a lot of practice, change the traditional aluminum sheet plug process, with white mesh to complete the circuit board surface welding and plug holes.
Image of local separation caused by local expansion between layers of substrate or between substrate and conductive foil or between substrate and protective coating.
in fact, no matter how to produce or design, ultimately can not be separated from the consideration of money, so should all the factors into the amount to make the final measurement standard to choose a suitable plate method.
Telegram