1756-EN2T

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1756-EN2T

工业里所用的元器件挺多的,每种在使用时会有着异样的使用要求的。作为工业里常用到的万用表,人们在使用时也是有需要去注意的。本文主要讲解的内容就是使用万用表来测量电阻阻值时需要注意哪些问题,一起来看看吧。
  万用表分为传统万用表和数字万用表,传统万用表是指针电磁偏转式的,每次使用前都需进行机械调零,使用较繁琐且示数的读取具有主观性,并不精确,现在已很少使用;而数字式万用表可直接显示数字,无需观察刻度进行读数,结果较精确,目前使用较为广泛。
  万用表测量电阻阻值时的注意事项:
  (1)在使用万用表之前,应先进行“机械调零”,即在没有被测电量时,使万用表指针指在零电压或零电流的位置上。
  (2)在使用万用表过程中,不能用手去接触表笔的金属部分,这样一方面可以保证测量的准确,另一方面也可以保证人身安全。
  (3)在测量某一电量时,不能在测量的同时换档,尤其是在测量高电压或大电流时,更应注意。否则,会使万用表毁坏。如需换挡,应先断开表笔,换挡后再去测量。
  (4)万用表在使用时,必须水平放置,以免造成误差。同时,还要注意到避免外界磁场对万用表的影响。
  (5)万用表使用完毕,应将转换开关置于交流电压的最大挡。如果长期不使用,还应将万用表内部的电池取出来,以免电池腐蚀表内其它器件。
  万用表是一种多功能、多量程的测量仪表,它不仅可以用来测量被测量物体的电阻,还可以测量直流电压。作为一种工业里重要的测量工具,熟知测量时要注意的点,才能更好的去发挥本身的作用。

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主营DCS系统配件
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选择深圳长欣,选择放心,售后无忧大量现货,当天顺丰发货!
主营:本特利,英维思,伍德沃德,福克斯波罗、西屋、瑞恩、施耐德莫迪康、ABB、AB、西门子、摩托罗拉、GE发那科、安川、博世力士乐,ACSO,力士乐等各大品牌的DCS系统配件,机器人系统配件,大型伺服系统备件。

先介绍几点经验。
1、先通读一遍“系统手册”(不管能不能看懂,先了解个大概,以便学习编程时查找);
2、由位控逻辑入手,逐渐增加定时、计数等条件,把或、与、非关系理顺;
3、进而练习整数运算、实数运算、类型转换;
4、量程转换、PID调节回路的建立及P、I、D参数的理解(最好是有个物理回路验证,比如变频器+电机+测速传感器);
5、循环、顺序、跳转等程序控制(尽量避免跳转,非跳不可时也是跳的越近越好);
6、中断、通讯、位置控制....

本人以ABB工业机器人配件DSQC系列和Motorola MVME系列,GE 卡件 模块 驱动器系列为主攻。各位电工朋友可根据自己的条件选择适合自己的PLC品牌,由于PLC的基本框架大同小异,学会一种至于其它的学习起来也就简单了。