《2022年数字万用表很重要的测量知识 .pdf》由会员分享，可在线阅读，更多相关《2022年数字万用表很重要的测量知识 .pdf（4页珍藏版）》请在taowenge.com淘文阁网|工程机械CAD图纸|机械工程制图|CAD装配图下载|SolidWorks_CaTia_CAD_UG_PROE_设计图分享下载上搜索。
1、数字万用表使用常识一、二极管档测量二极管数字万用表的二极管档其实是个电流源输出档，反向直流电压约为 2.8V，正向测量电流约1mA。当测量电阻小于70左右时机内蜂鸣器响，显示电阻近似值，单位是千欧。测量二极管时界面显示1.775、0.560 等数字是指二极管正向压降近似值，硅管0.550-0.700V,锗管 0.150-0.300V，表示该二极管在此电压下即可导通。硅二极管正向导通压降约为0.30.8V。锗二极管锗正向导通压降约为 0.10.3V。并且功率大一些的二极管正向压降要小一些。如果测量值小于0.1V，说明二极管击穿，此时正反向都导通。对于发光二极管，正向测量时二极管发光，管压降约1.
2、7V左右。发光二极管的正向电阻一般应小于50-80；反向电阻应大于 400k。二、二极管档测量三极管三极管有两个PN 结，发射结（be）和集电结（bc），按测量二极管的方法测量即可。在实际测量时，每两个管脚间都要测正反向压降，共要测 6 次，其中有 4 次显示开路，只有两次显示压降值，否则三极管是坏的或是特殊三极管（如带阻三极管、达林顿三极管等，可通过型号与普通三极管区分开来）。在两次有数值的测量中，如果黑表笔或红表笔接同一极，则该极是基极，测量值较小的是集电节，较大的是发射节，因为已判断出基极，对应可以判断出集电极和发射极。同时可以判断：如果黑表笔接同一极，则三极管是 PNP 型，如果红表笔
3、接同一极，则三极管是 NPN 型；压降为 0.6V 左右的是硅管，压降为0.2V 左右的是锗管。三、二极管档测量光耦光耦的一侧是发光二极管，测量时压降约1V 左右，另外一侧是三极管，有的只引出c、e，测量正反向均截止，如果三个脚都引出，测量特性同上面三极管（多为NPN 管）。当用一个万用表使二极管正向导通，此时用另外一块万用表测三极管c 对 e导通压降约为 0.15V；断开接二极管的万用表，三极管c 对 e 截止，说明该光耦是好的四、二极管档测量电容器在路检测小容量电容器时，蜂鸣器急速响一下，然后显示为“1”。交换表笔再测又响一下，然后显示为“1”，说明此电容是好的。大容量的电容器，蜂鸣器发声
4、时间会延长如始终不响（小容量的电容器，蜂鸣器不响。应拆下用适当量程的电容档测量。）说明断路。若始终响个不停，说明断路或漏电。注意测量大电容前一定要放电。五、二极管档测量电阻数字万用表COM 插孔是接地或 _插孔，插黑表笔。测量1M以上电阻时，需几秒才能稳定数值，这是正常现象。使用 200档时，先将表笔短接，显示表笔线的电阻值，实际中应该减去这一电阻值，得到的才是实际电阻值。文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W1
5、0 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F
6、5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W
7、10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码
8、:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9
9、S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6
10、 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4
11、S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10六、使用数字万用表判断三极管管脚1、基极判断：三极管的内部就像二个二极管组合而成的，其形式就像下图。中间的是基极（b 极）。看上图可知，对于 PNP 管的基极是二个负极的共同点，NPN管的基极是二个正极的共同点。用数字万用表的二极管档去测基极，对于 PNP 管，当黑表笔（连表内电池负极）在基极上，红表笔去测另两个极时一般为相差不大的较小读数（一0.5-0.8），如表笔反过来接则为一个较大的
12、读数（一般为1）。对于 NPN表来说则是红表笔（连表内电池正极）连在基极上。2、判断发射极和集电极：三极管发射极是发射电子的，因此发射极需要掺更多的杂质，因此，基极与发射极之间的压降要高于基极与集电极之间的压降，通过读数大小来判断C、E，数字小（压降小）的是集电极，数字大的（压降大）的是发射极。文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9
13、W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV
14、4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T
15、2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档
16、编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9
17、U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4
18、A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9
19、P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9
20、W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV
21、4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T
22、2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档
23、编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9
24、U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10文档编码:CS9U9S1V4A6 HG9P4S1X9W10 ZV4F5H7T2W10