MIME-Version: 1.0 Content-Type: multipart/related; boundary="----=_NextPart_01CA66BF.96E4BC80" 此文档为“单个文件网页”，也称为“Web 档案”文件。如果您看到此消息，但是您的浏览器或编辑器不支持“Web 档案”文件。请下载支持“Web 档案”的浏览器，如 Microsoft Internet Explorer。 ------=_NextPart_01CA66BF.96E4BC80 Content-Location: file:///C:/2CDF2062/file0322.htm Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset="us-ascii" 用电位差计校正电= 387;表

 

用电位差&#= 35745;校正电压表

 

一= 2289;实验目的

= 1．了解箱式电߮= 1;差计的结构、原理。<= /p>

= 2．学会用箱式ஸ= 5;位差计校正电压表，&= #29087;练掌握箱式电位差#= 745;的使用。

二= 2289;实验仪器

箱式= 0005;位差计（UJ31型= 0452;流低电势电位差计ᦀ= 9;、直流稳压电源、滑&= #32447;变阻器、待校电压"= 920;（量程1V）z= 89;电阻箱2个ᦀ= 8;代替标准电阻）、单&= #20992;单掷开关、导线等 = 290;

三= 2289;、实验设计要求

用电位差计校准= 量程为1V的电压表&#= 65292;要求校正点在五个É= 97;上。

（1）设计用电位差= 计校正大于电位差计= 7327;程的直流电压表的ஸ= 5;路图，要求控制电路&= #30340;电压调节范围在间连= 续可调。

（2）根据电位差计= （171mV）和= 待校电压表的量程（1V），使用&#= 20004;个标准电阻箱，选Ö= 62;适当的分压比。

（3）作校准曲线，= 并确定待测ஸ= 5;压表准确度等级,对待= 校电压表的精度作出= 5780;价。

自己设计实验步= 骤和记录表格，以完= 5104;实验。

 

四= 2289;实验提示

1．所谓校准是使被= 校电压表与标准电压= 4920;（本实验中使用）ࡧ= 6;时测量一定的电压，&= #30475;其指示值与相应的= 631;准值（由电位差计测= ;出）相符的程度。用UJ31型电位差计作为= 标准电压表来校准被= 6657;电压表，考虑到UJ31电位= 差计测量范围为0~171mV，被= 校表量程为1V，所以必&#= 39035;利用分压电路。为Ñ= 43;小测量误差，当被校= 表满度时，电位差计= 0134;应接近测量上限，ਠ= 5;应据此设计分压电路&= #30340;分压比（用电阻箱= 195;替标准电阻构成分压= ;器）。

2．确定待测电压表&= #20934;确度等级的方法：

通过校准į= 40;实验数据,得到电表各个࠹= 1;度的绝对误差。选取&= #20854;中最大的绝对误差&= 500;以量程，即得该电表= ;的标称误差，即

标ĸ= 16;误差=3D  

根据标称&#= 35823;差的大小，将电表Ñ= 98;为不同的等级，常记= 为K。例如，若0.5%<标称误差≤1.0%，则该电&#= 34920;的等级为1.0级。

 

五= 2289;用电位差计校准电ඤ= 0;评分标准

（一）预习报告= 及课堂操作5分

1、预习报&#= 21578;、步骤设计及课堂ÿ= 52;问1分

（1）实验报告上正= 确画出所设计的线路= 2270;0.5分<= /p>

（2）实验步骤清楚= 、正确，回答问题准= 0830;0.5分<= /p>

2、课堂操&#= 20316;4分

（1）电位差计连接= 正确，实验线路接线= 7491;确1.5分<= /p>

（2）正确使用电位= 差计进行校表1分

（3）实验记录表格= 设计合理，实验数据= 0934;确1分

（4）操作完毕后，= 拆除线路、整理好仪= 2120;等0.5分<= /p>

（二）实验报告= 5分

1、实验数&#= 25454;计算步骤清楚、公ó= 35;运用准确1分

2、正确确&#= 23450;出电压表的精度等ń= 23;1.5分<= /p>

3、正确画&#= 20986;标准曲线 1.5分<= /p>

4、实验报&#= 21578;及实验结论书写规ŏ= 39;  1分

 

 

 

附1：

电工= 仪表的精度等级

电工测量指示仪= 表在额定条件下使用= 6102;，其最大基本误差௚= 0;百分数称为仪表精度&= #31561;级a的百分数&#= 65292;即±a%=3D（ΔXm/Xm）×<= /span>100%。<= /p>

其中，Δ= Xm为最大绝对误差= ，Xm为仪表的&#= 22522;本量程。

国家标准规定，= 电压表和电流表的精= 4230;等级分0.05、<= span lang=3DEN-US>0.1、<= span lang=3DEN-US>0.2、<= span lang=3DEN-US>0.3、<= span lang=3DEN-US>0.5、<= span lang=3DEN-US>1.0、<= span lang=3DEN-US>1.5、<= span lang=3DEN-US>2.0、<= span lang=3DEN-US>2.5、<= span lang=3DEN-US>3.0、<= span lang=3DEN-US>5.0等十= 一级；

测量时，仪表全= 量程范围内的指示误= 4046;不得超过最大基本෾= 3;差。

 

附2：

对于= 仪表精度需说明的问= 9064;

1.仪表的精&#= 24230;并非测量精度。仪ŝ= 20;运用在满刻度偏转时= ，相对误差较小。

2.要提高测&#= 37327;精度，应从两方面ı= 28;手：一是选用精度等= 级高的仪表；二是使= 0202;表尽可能运用在满ࠇ= 9;转状态。因此应合理&= #36873;择仪表的量程。

3.非线性刻&#= 24230;的仪表其示值相对Ŧ= 23;差不能用上述方式计= 算。例如，对于万用= 4920;电阻档，当指示值=3D中心= 值=3D时，= 测量误差最小。因此= 5292;为了减小误差，一ഄ= 4;以指针在中心电阻值&= #30340;0.2～<= span lang=3DEN-US>2.5倍之= 间为宜。

 

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