天气预报15天查询> 其他> 如何测量一根电话线的通断

如何测量一根电话线的通断

更新时间: 2020-07-01 00:00:00     

测量一根电话线通断的步骤如下:

1、将电话线一端连在一起,两根电线就成为一根。

2、然后在另一端用万用表电阻挡测量。

3、把万用表打到二极管测量位置,两个表笔接触会有蜂鸣,说明表正常,然后用表笔分别接触电源线的两端,有蜂鸣说明完好,不蜂鸣说明断路。

关键词: 如何 测量 电话线

如有意见、反馈、侵权或投诉等情况,请联系:

电话:
邮箱:

我们将会在48小时内给与处理!

版权所有 Copyright ? 2009-2020 tianqiyubao3.com

页面:/news/view-589832/ | 耗时:0.3605 s | 内存:1.89 MB | 查询:4 | 缓存读取:4 写入:0 | 加载文件:23
select * from tbl_Articles WHERE ArticleID=589832 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=589832 LIMIT 0,1
select * from tbl_Articles_sphinx where id=589832 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(986336,1070088,1077112,1098825,1129029,1070284,1082173,1080913,1127601,1090801,1094387,1085256,1093625,1058843,1081277,1107168,1092926,1069221,1076029,1073276,1079217,1074618,1084259,1130238,1086832,1063309,1092034,1072278,1067795,1076209) ORDER BY field (ArticleID,986336,1070088,1077112,1098825,1129029,1070284,1082173,1080913,1127601,1090801,1094387,1085256,1093625,1058843,1081277,1107168,1092926,1069221,1076029,1073276,1079217,1074618,1084259,1130238,1086832,1063309,1092034,1072278,1067795,1076209)