PCB新聞 - PCB板設計中的一些檢查項目和注意事項

在裡面 PCB設計.設計中的一些檢查項目和注意事項 PCB板

設計檢查

以下清單包括與設計週期相關的所有方面，特別是：應用程序還應添加一些其他項目。

一般項目

1) Has the circuit been analyzed? 電路是否劃分為基本單元以平滑訊號?
2) Does the circuit allow short or isolated key leads?
3) Where must be shielded, 是否有效遮罩?
4) Have you made full use of the basic grid graphics?
5) Is the size of the PCB the best size?
6) Do you use the selected wire width and spacing as much as possible?
7) Has the preferred pad size and hole size been used?
8) Are the photographic plates and sketches appropriate?
9) Is the use of jumper wires the least? 跨接導線是否穿過部件和附件?
l0) Are the letters visible after assembly? 它們的尺寸和型號正確嗎?
11) In order to prevent blistering, 大面積銅箔上有窗戶嗎?
12) Are there tool positioning holes?

Physical characteristics
1) Are all pads and their positions suitable for final assembly?
2) Can the assembled PCB meet the 震驚 and 振動 conditions?
3) What is the required spacing of standard components?
4) Are the components that are not firmly installed or the heavier parts fixed?
5) Is the heating element cooling and cooling properly? 還是與PCB和其他熱敏元件隔離?
6) Are the voltage divider and other multi-lead components positioned correctly?
7) Is the arrangement and orientation of the components easy to check?
8) Have all possible interferences on the PCB and the entire PCB組件 已被淘汰?
9) Is the size of the positioning hole correct?
10) Is the tolerance complete and reasonable?
11) Have you controlled and signed the physical properties of all coating layers?
12) Is the diameter ratio of the hole and the lead wire within the acceptable range?

機械設計因素

儘管PCB採用機械方法來支撐組件, 它不能用作整個設備的結構部分. 印版邊緣, 至少每5英寸一次，以獲得一定的支撐力.
The factors that must be considered when selecting and designing PCB are as follows;
1) PCB structure-size and shape.
2) Types of mechanical accessories and plugs (seats) required.
3) The adaptability of the circuit to other circuits and environmental conditions.
4) Consider installing the PCB vertically or horizontally according to some factors, 比如高溫和灰塵.
5) Some environmental factors that require special attention, 比如散熱, 通風, shock, vibration, 和濕度. 灰塵, 鹽霧和輻射.
6) The degree of support.
7) Keep and fix.
8) Easy to take off.

Electrical characteristics
1) Have you analyzed the influence of wire resistance, 電感, 和電容? 特別地, 您是否分析了關鍵壓降相位接地?
2) Does the spacing and shape of the wire accessories meet the insulation requirements?
3) Has the insulation resistance value been controlled and specified in key areas?
4) Is the polarity fully recognized?
5) Is the influence of wire spacing on leakage resistance and voltage measured from a geometrical point of view?
6) Has the medium for changing the surface coating been identified?