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第二节焊接技能的讲解与常用仪器的 使用 主讲人:*Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.万用表Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.基本功能1、直流电压测量 2、交流电压测量 3、直流电流测量 4、交流电流测量 5、电容测量 6、电阻测量Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.v一、电压的测量1、直流电压的测量。首先将黑表笔插进“com” 孔,红表笔插进“V ”。把旋钮选到比估计值大的 量程 (注意:表盘上的数值均为最大量程,“V” 表示直流电压档),接着把表笔接电源或电池两端 ;保持接触稳定。数值可以直接从显示屏上读取, 若显示为“1.”,则表明量程太小,那么就要加大量程 后再测量工业电器。 如果在数值左边出现“-”,则表 明表笔极性与实际电源极性相反,此时红表笔接的 是负极。v 2、交流电压的测量。表笔插孔与直流电压的测 量一样,不过应该将旋钮打到交流档“V”处所需的 量程即可。交流电压无正负之分,测量方法跟前面 相同。 无论测交流还是直流电压,都要注意人身安 全,不要随便用手触摸表笔的金属部分。 Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.v二、电流的测量1、直流电流的测量。先将黑表笔插入“COM” 孔。若测量大于200mA的电流,则要将红表笔插入 “10A”插孔并将旋钮打到直流 “10A”档;若测量小于 200mA的电流,则将红表笔插入 “200mA”插孔,将 旋钮打到直流200mA以内的合适量程。调整好后, 就可以测量了。将 万用表串进电路中,保持稳定, 即可读数。若显示为“1.”,那么就要加大量程;如果 在数值左边出现“-”,则表明电流从黑表笔流进万用 表。2、交流电流的测量。测量方法与1相同,不过 档位应该打到交流档位。 Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.三、电阻的测量将表笔插进“COM”和“V”孔中,把旋钮 打旋到“”中所需的量程,用表笔接在电阻两 端金属部位,测量中可以用手接触电阻,但 不要把手同时接触电阻两端,这样会影响测 量精确度的人体是电阻很大但是有限大 的导体。读数时,要保持表笔和电阻有良好 的接触;注意单位:在“200” 档时单位是“” ,在“2K”到“200K“档时单位为 “K ”,“2M”以 上的单位是“M”。 Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.二极管档 原理:一个电源串联蜂鸣器,然后两端就是 触笔了,如果二极管是导电那一向,线路接通, 蜂鸣器就会叫了,反过来,蜂鸣器就叫不出来了 一般会带有测电路通不通的功能,就是说 当被测电路中的电阻小于10欧姆的时候就会 发出报警声 。二极管档是用来测二极管好坏 的,二极管的性质就是单向导电,测量值表 示二极管的正向电压值,单位为V。 注意:万用表二极管档是不允许通电的情 况下测试器件的 。Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.三极管最基本的作用是放大作用 Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.v按材料不同分锗管和硅管,按半导体基片材 料的不同分为PNP型和NPN型,有三个极, 分别为B极(基极)、C极(集电极)、E极 (发射极),三极管在电路中的符号是“VT” 或“Q”或“V”。晶体管是电流控制元件。 v主要参数:放大倍数、截止频率、集电极最 大电流、集电极最大功耗等v常用PNP管:8550、9012、9015v常用NPN管:8050、9018、9016、9014、 9013、9011Evaluation only.Evaluation only. Created with Aspo
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