Abstract: The present disclosure relates to a method for determining a softening temperature of copper and copper alloy, including: selecting a plurality of samples of the same material, annealing the plurality of samples at different temperatures, air-cooling the plurality of samples; measuring the tensile strength of an original sample and the plurality of samples after the annealing; plotting a data of the measured tensile strength into a temperature-tensile strength curve; a temperature at which the tensile strength in the temperature-tensile strength curve drops to a certain value of an original sample tensile strength is the softening temperature of the material. The above technical solution in the present disclosure uses the tensile strength instead of hardness to measure the softening temperature. It can effectively improve the detection efficiency and reduce the cost, and can be widely used in determination of the softening temperature of fine materials of copper and copper alloy.

Abstract: A method for wiring differential signal lines and a PCB are disclosed. The wiring method includes: providing a rectangle-shaped glass fiber fabric formed of glass fibers which are woven and interlaced with each other and an adhesive filled therebetween; determining a wiring direction and obtaining a glass fiber bundle number of the glass fiber fabric in the wiring direction; equally dividing the glass fiber fabric into glass fiber units, and obtaining a width of each glass fiber unit according to a size of the glass fiber fabric in a direction perpendicular to the wiring direction and the number of the glass fiber units; determining a line distance and line widths of the differential signal lines; and according to the line distance and the line widths, forming the differential signal lines on a metal layer along the wiring direction to make the differential signal lines meet predetermined requirements.

Abstract: A method for wiring differential signal lines and a PCB are disclosed. The wiring method includes: providing a rectangle-shaped glass fiber fabric formed of glass fibers which are woven and interlaced with each other and an adhesive filled therebetween; determining a wiring direction and obtaining a glass fiber bundle number of the glass fiber fabric in the wiring direction; equally dividing the glass fiber fabric into glass fiber units, and obtaining a width of each glass fiber unit according to a size of the glass fiber fabric in a direction perpendicular to the wiring direction and the number of the glass fiber units; determining a line distance and line widths of the differential signal lines; and according to the line distance and the line widths, forming the differential signal lines on a metal layer along the wiring direction to make the differential signal lines meet predetermined requirements.