《项目二制作单片开机发板》由会员分享，可在线阅读，更多相关《项目二制作单片开机发板（36页珍藏版）》请在金锄头文库上搜索。
1、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.1本章任务 掌握基本电子元件的识别与检测方法 熟练掌握手工焊接的基本技能 焊接制作单片机开发板的电路 Evaluation only.Eva
2、luation 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. 掌握基本电子元件的识别与检测 掌握基本电子仪表的使用方法 掌握电路焊接的基本技能 熟练掌握8051单片机最小系统和外围接口电路 能设计和制作一个8051单片机开发板本章目标Ev
3、aluation 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.电阻元件的识别与检测电阻器的基本功能 通过分压电路提供所需的电压（分压作用）。 通过限流电路提供所需的电流（限流作用）。Evaluation o
4、nly.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.电阻参数 电阻器共有6个主要参数： 标称阻值：电阻体表面上标志的电阻值。 允许误差：实际与标称所允许的最大偏差范围。 额度功率：连续工作所允许承受的最大功率 。 温
5、度系数：电阻热稳定性随温度变化的物理量。 电压系数：电压每改变1V时电阻值相对变化量。 最大电压：电阻不发生过热或击穿时最大电压。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.电阻命名电
6、阻器的命名及规格 电阻器命名：国家规定,固定电阻由4部分构成。6GTR电阻器导电材料电阻器类别序号电阻器代号电阻RTG6：6号、高功率、碳膜、固定电阻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
7、 Ltd.电阻值的标识方法 直标法：将电阻参数直接标示在电阻表面上电阻RJ5 50K1%普通电阻金属膜 高温标称阻值允许误差形式一：用数字和单位符号直接标称。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
8、 Pty Ltd.电阻值的标识方法形式二：用数字和符号有规律组合标称。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.形式三：用三位数字标示片状电阻。电阻1R=220电阻2R=3.3221
9、3R3电阻4R=6.8k6801电阻值的标识方法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.电阻值的标识方法 色标标法：将电电阻参数以不同的颜颜色带带来标标示。 颜色对照表 四色环标示
10、第1位有效数(黄:4)允许误差(金:5%)电阻第2位有效数(紫:7)倍乘(橙:103)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.电阻值的标识方法 颜色对照表 色标法：将电阻参数以不同
11、的颜色带来标示。 五色环标示电阻第1位有效数(棕:1)倍乘(金:10- 1)第2位有效数(灰:8)允许误差(棕:1%)第3位有效数(黑:0)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.
12、开发板中使用到的电阻 合成碳膜电阻：将碳黑、填料与 有机粘合剂调配成悬浮液，喷涂在 绝缘骨架上并加热聚合而成。高压高阻抗湿性差，电压稳定性低，频率特性 不好，噪声大 生产设备、工艺简单且造价较低 排电阻器：也称集成电阻器或电阻器网络。 按一定规律排列的分立电阻器集成在一起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. Copy
13、right 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.电容器的功能特点 电容器：一种可贮存电荷的元件。 电容器在电路中的主要功能有稳定电压、隔离 直流、与电阻或电感形成谐振电路等。 耦合电容器用于传输交流信号。 电容上的电压有建立过程，不能突变。电池 充电放电Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET
14、 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.电容器的功能特点 电容器的两个特性 阻止直流电通过，而允许交流电通过。 含直流成分的交 流电压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
15、.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.电容器的标量方法 电容器规格的直标法电容的名称标称容量允许误差额定电压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 Pt
16、y Ltd.Copyright 2004-2011 Aspose Pty Ltd.电容器的标量方法 电容器标称容量的标示方法332n电容1C=332nF332电容2C=3.32FEvaluation 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.开发板中用到的电容类型 铝电解电容器有正负极之分体积小且容量大、重量轻在电路中常作滤波、旁路及 耦合之用 瓷介电容器温度系数范围宽，且价格低、体积小损耗小、稳定性好且耐高温高压无正负极之分Evaluation only.Eval
