What is PCB warpage

2018-11-23 17:45Writer: qyadminReading:
First, that is when the copper is copper mesh good or good, big board, copper mesh is good, because when the copper will remain warped by external circumstances, the grid will not be restored to maintain the ~ the original formation, the general process of copper left side also aim is to protect the warpage of the board.
  IPC standard warpage is less than 0.75%, is qualified products!
  How to measure, first put in the marble platform PCB board
  Or greater than 5mm thick glass plate
  Use plug gauge measuring the size of the largest corner
  Then take the diagonal length of the PCB using a measuring tape
  Divides two numbers, if more than seven thousandths on substandard


 PCB warpage

pcb backup board
pcb back up board backup material