测量方法:万用表应与被测电路串联。应将电路相应部分断开后,将万用表表笔接在断点的两端。红表笔应接在和电源正极相连的断点,黑表笔接在和电源负极相连的断点。
用万用表测功率步骤如下:
1、首先选择合适的档位。如图所标识,各个用于测量的档位都标明了该选用哪一个电表笔孔将电表笔插入需要电表笔孔的测量。
![](https://video.ask-data.xyz/img.php?b=https://iknow-pic.cdn.bcebos.com/d50735fae6cd7b899e05d8e5022442a7d9330e6e?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
2、连接电笔与万用表。测量电压的孔位选择公共孔位,以及电压电阻项孔位,将电笔插好后如图所示
![](https://video.ask-data.xyz/img.php?b=https://iknow-pic.cdn.bcebos.com/35a85edf8db1cb13f291de75d054564e93584bd8?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
3、与被测量电路相连,开始测量。
![](https://video.ask-data.xyz/img.php?b=https://iknow-pic.cdn.bcebos.com/5882b2b7d0a20cf4bda013b97b094b36acaf99a0?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
4、 正确读出通过发光二极管的电流值。
![](https://video.ask-data.xyz/img.php?b=https://iknow-pic.cdn.bcebos.com/bba1cd11728b47105bb610aacecec3fdfc03233f?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
5、测量完毕,断开电源,按要求收好万用表。
![](https://video.ask-data.xyz/img.php?b=https://iknow-pic.cdn.bcebos.com/359b033b5bb5c9ea6749ee85d839b6003af3b31a?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)