外文文獻(xiàn)翻譯--數(shù)字電壓表技術(shù)-其他專業(yè)(編輯修改稿)
2025-02-24 09:02 本頁(yè)面
【文章內(nèi)容簡(jiǎn)介】 ces the possibility of making errors. To protect the board during storage from oxidation and assure it gets to you in perfect condition the copper is tinned during manufacturing and covered with a special varnish that protects it from getting oxidised and also makes soldering easier. Soldering the ponents to the board is the only way to build your circuit and from the way you do it depends greatly your success or failure. This work is not very difficult and if you stick to a few rules you should have no problems. The soldering iron that you use must be light and its power should not exceed the 25 Watts. The tip should be fine and must be kept clean at all times. For this purpose e very handy specially made sponges that are kept wet and from time to time you can wipe the hot tip on them to remove all the residues that tend to accumulate on it. DO NOT file or sandpaper a dirty or worn out tip. If the tip cannot be cleaned, replace it. There are many different types of solder in the market and you should choose a good quality one that contains the necessary flux in its core, to assure a perfect joint every time. DO NOT use soldering flux apart from that which is already included in your solder. Too much flux can cause many problems and is one of the main causes of circuit malfunction. If nevertheless you have to use extra flux, as it is the case when you have to tin copper wires, clean it very thoroughly after you finish your work. In order to solder a ponent correctly you should do the following: Clean the ponent leads with a small piece of emery paper. Bend them at the correct distance from the ponent’s body and insert the ponent in its place on the board. You may find sometimes a ponent with heavier gauge leads than usual, that are too thick to enter in the holes of the . board. In this case use a mini drill to enlarge the holes slightly. Do not make the holes too large as this is going to make soldering difficult afterwards. Take the hot iron and place its tip on the ponent lead while holding the end of the solder wire at the point where the lead emerges from the board. The iron tip must touch the lead slightly above the . board. When the solder starts to melt and flow wait till it covers evenly the area around the hole and 5 the flux boils and gets out from underneath the solder. The whole operation should not take more than 5 seconds. Remove the iron and allow the solder to cool naturally without blowing on it or moving the ponent. If everything was done properly the surface of the joint must have a bright metallic finish and its edges should be smoothly ended on the ponent lead and the board track. If the solder looks dull, cracked, or has the shape of a blob then you have made a dry joint and you should remove the solder (with a pump, or a solder wick) and redo it. Take care not to
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