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PCB配線完了後チェックするアイテム
PCBブログ
PCB配線完了後チェックするアイテム

PCB配線完了後チェックするアイテム

2022-04-25
View:109
Author:pcb

1. PCBボード design inspection
The following checklist covers all aspects of the design cycle, 特別なアプリケーションのための追加項目. 一般 PCBボード design drawing inspection items:
1) The circuit is analyzed or not, and the circuit is divided into basic units in order to smooth the signal;
2) Whether the circuit allows the use of short or isolated key leads;
3) Where must be shielded, whether it is effectively shielded;
4) Make full use of the basic grid graphics without;
5) Whether the size of the printed board is the size;
6) Whether to use the selected wire width and spacing as much as possible;
7) Whether the preferred pad size and hole size are used;
8) Whether the photographic plate and sketch are suitable;
9) Whether there are few jumper wires used; whether the jumper wires should pass through components and accessories;
10) Whether the letters are visible after assembly; whether their size and model are correct;
11) In order to prevent blistering, 銅箔の大面積は開いているか?
12) Whether there is a tool positioning hole;

PCBボード

2. PCBボード electrical characteristics inspection items
1) Whether the influence of wire resistance, inductance and capacitance has been analyzed; especially the influence of the key voltage drop to grounding;
2) Whether the spacing and shape of the wire accessories meet the insulation requirements;
3) Whether the insulation resistance value is controlled and specified at key points;
4) Whether the polarity is adequately identified;
5) The influence of wire spacing on leakage resistance and voltage was measured from the geometrical point of view;
6) Whether the medium that changes the surface coating has been identified;

3. PCBボード physical characteristics inspection items
1) Whether all pads and their positions are suitable for final assembly;
2) Whether the assembled printed board can meet the ショック and 振動 power conditions;
3) What is the spacing of the specified standard components;
4) Whether the components that are not firmly installed or the heavier parts are fixed well;
5) Whether the heat dissipation and cooling of the heating element are correct; or whether it is isolated from the printed board and other thermal elements;
6) Whether the voltage divider and other multi-lead components are positioned correctly;
7) Component arrangement and orientation for easy inspection;
8) Whether all possible interference on the printed board and the entire printed board assembly has been eliminated;
9) Whether the size of the positioning hole is correct;
10) Whether the tolerance is complete and reasonable;
11) Control and sign off the physical properties of all coatings;
12) Whether the ratio of the diameter of the hole to the lead wire is within the acceptable range;

4. PCBボード mechanical design factors
Although the printed board supports components mechanically, デバイス全体の構造部分として使用できません. 印刷版の縁に, サポートの特定の量の少なくとも5インチ. The factors that must be considered in the selection and design of printed boards are as follows;
1) The structure of the printed board - size and shape.
2) The type of mechanical accessories and plugs (seats) required.
3) The adaptability of the circuit to other circuits and environmental conditions.
4) Consider mounting the printed board vertically or horizontally depending on factors such as heat and dust.
5) Some environmental factors that need special attention, 放熱のような, 換気, shock, vibration, 湿度. 塵, 塩噴霧と放射.
6) Degree of support.
7) Hold and fix.
8) Easy to take off.

5. Installation requirements for printed circuit boards
It should be supported at least within 1 inch of the three edge edges of the printed board. 実務経験別, 厚さ0のプリント板の支持点間隔.031 - 0.062インチは、少なくとも4インチでなければなりません;厚さが0以上のプリント板について.093インチ, サポートポイントの間隔は、少なくとも4インチ. 5インチ. この措置をとることにより、プリント基板の剛性が増大し、プリント基板の共振が破壊される. プリント基板は、通常、その実装技術を決定する前に、以下の要因を考慮しなければならない.
1) The size and shape of the printed board.
2) Number of input and output terminals.
3) The available equipment space.
4) Desired ease of loading and unloading.
5) The type of installation accessories.
6) The required heat dissipation.
7) Required shieldability.
8) The type of circuit and its relationship with other circuits.

6. Dial-out requirements for printed boards
1) No printed board area for mounting components.
2) The influence of plugging tools on the installation distance between two printed boards.
3) The mounting holes and slots should be specially prepared in the design of the printed board.
4) When the plug-in tool is to be used in the equipment, 特にサイズは考慮すべきである.
5) A plug-in device is required, リベット付きプリント基板アセンブリには通常固定される.
6) In the mounting frame of the printed board, 荷重軸受フランジなどの特別な設計が必要である.
7) The adaptability of the plugging tools used to the size, プリント板の形状及び厚さ.
8) The cost involved in using plugging and unplugging tools includes both the price of the tool and the increased expenditure.
9) In order to tighten and use plug-in tools, 機器の内部にはある程度アクセスする必要がある.

7. PCBボード mechanical considerations
Substrate properties that have a significant impact on printed circuit assemblies are: water absorption, 熱膨張係数, 熱的性質, 曲げ強さ, 衝撃強さ, 引張強さ, せん断強度. これらの特性の全ては、プリント基板構造の機能性およびプリント基板構造の生産性に影響を及ぼす. ほとんどのアプリケーション, the printed circuit board's dielectric backing is one of the following:
1) Phenolic impregnated paper.
2) Acrylic-polyester impregnated glass mats with random arrangement.
3) Epoxy impregnated paper.
4) Epoxy impregnated glass cloth.
各基板は難燃性または可燃性であり得る. 上記1, 2, 3パンチすることができます. 金属化ホールプリント板用の一般的な材料はエポキシガラス布である. その寸法安定性は高密度回路に適している, そして、それは、金属化された穴のクラックの発生を減らすことができます. エポキシガラスクロス積層板の欠点は、プリント基板の通常の厚み範囲ではパンチが困難であることである, このため、全ての穴は通常ドリル加工され、コピーミリング動作が用いられてプリント板形状が形成される.

8. PCB wire spacing
The conductors must be spaced to eliminate voltage breakdown or arcing between adjacent conductors. Spacing is variable and depends primarily on the following factors:
1) Peak voltage between adjacent wires.
2) Atmospheric pressure (working height).
3) Coating layer used.
4) Capacitive coupling parameters.
臨界インピーダンスコンポーネントまたは高周波数成分は、一般に、臨界ステージ遅延を低減するために近接して配置される. 変圧器と誘導部品は、結合を防止するために絶縁されなければならない誘導信号線は直角に直角に走る磁界の動きに起因する電気的ノイズを発生させる部品は、過大な振動を防止するために分離され、または堅固に取り付けられるべきである.

9. PCBボード ワイヤパターン inspection
1) Whether the wire is short and straight without sacrificing function;
2) Whether the limitation of wire width is complied with;
3) Check whether the distance between wires, ワイヤーと取付穴の間, and between wires and pads must be guaranteed;
4) Whether the parallel arrangement of all wires (including component leads) is relatively close is avoided;
5) Whether acute angles (90°C or less) are avoided in the PCBボード wire pattern.