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怎样用指针万用表精确测量电容

点击数:2019-07-11 09:09 来源:未知

  怎样用指针万用表精确测量电容( 1 )机房空调分为精密空调和普通空调,系统应能实现对两类空调的,功能包括开关机、设定工作模式、设定温度、风速等,普通空调除上述要求外,还应具备可°旋转,可调成柱状大射程米,也可调成雾状大射程米,可调成来电自启功能,系统不许改动空调内部线路,避免产生事故隐患。可能原因:变比不对,电压电流的相序错,解决方法:将仪表设置的变比与PT、CT的变比核对是否一致; 检查电压、电流的相序是否正确; 在用电的情况下,有功率显示的仪表可以通过仪表的功率显示查看单相功率是否有负号指示,有负号指示的则很可能对应的那相电流的进出线反了。

  项目实施前期,宝鸡市政府大力支持,通过召开全市城市居民用电户表改造工作推进会,并由市政府同各区县政府签订目标责任书,共同推进户表改造工作。作为实施单位的宝鸡供电公司,积极联系省计量中心为合表改造配送计量表计、备品备件和施工物资,确保改造工程顺利推进。

  我们在电器维修过程中,经常用万用表检测电容器的好坏。传统的方法是和同样型号电容器进行充放电比较,操作很不方便,有些电容由于引脚短、容量过大,有时也不能用数字万用表检测。笔者在长期的维修实践中,摸索出一个简单而又实用的检测方法,现介绍如下,希望能给同行们带来一点点方便。在电学测量中,有两种结构完全相同的电流计。一种是冲击电流计。它是用来测量脉冲电流的电量的精密仪表,当流过冲击电流计的脉冲电流的持续时间远小于冲击电流计表针的自由振荡周期时,表针的最大偏转幅度正比于脉冲电流的电量,从而可线性地测量脉冲电流的电量。另一种是灵敏电流计,指针万用表的表头就是一种灵敏电流计。用指针万用表的电阻挡测量电容时,将产生一个脉冲充电电流,如果此脉冲电流的持续时间远小于表头指针的自由振荡周期,表头由灵敏电流计变为冲击电流计,其指针的最大偏转幅度Am正比于该脉冲电流对电容器所充的电量Q。而电容器的电量Q=CE,E为该电阻挡的电池电动势,是定值,所以Q又正比于电容量C,表针的最大偏转幅度Am也就正比于电容量C。根据这个道理,就有可能用线性读数来测量电容量。指针万用表的电阻挡在小角度偏转时全满足上述规律,因此可准确测量电容量。现以MF500型万用表为例,说明添加电容刻度的方法和使用。MF500型万用表刻度盘如图所示,选取直流均匀刻度线小格作电容量的线性刻度。这是因为它既可满足小角度偏转的线性条件,又方便读数。超过10格,刻度将逐渐变为非线性。取一个新电容器,例如标称值为3.3F的电容器,用数字万用表测得其实际容量为3.61F,把500型万用表的R×1挡作欧姆调零。用表笔尖使电容器放电后,用两表笔接触电容器两极,观察表针的最大偏转幅度。再用R×10、R×100、R×1k、R×10k挡依次重复上述步骤,看哪一挡在10小格范围内偏转幅度最大。结果在R×1k挡时,表针的偏转幅度最大,为3小格,用3.6μF除以3小格,得RX1k挡的电容灵敏度为,1.2F/格,只要测出一个挡的电容灵敏度,就可算得其他挡的灵敏度,电阻倍率高的灵敏度高,倍率低的灵敏度低,相邻挡成10倍关系递推。于是得MF500型万用表电阻挡的电容灵敏度如下,RX1挡—1200F/格,R×10挡1201F/格,R×100挡—12F格。R×1k挡——1.2F/格。Rx10k挡-----0.12F(120nF)/格。从上面500型表的电容灵敏度可看出,最大可测容量为1200F格×10格=12000F,因此,完全能适应日常维修的要求。笔者就是把这组数字刻在了电阻挡旋钮上,使用起来很方便。3、放电、测量、读数,用表笔尖短路被测电容器的两引线,进行放电。放电后,用两表笔分别接触电容两引线(电解电容“+”极接黑表笔,“-”极接红表笔)。这时可读取表针的最大偏转,实读为8.5格。5.再观察表针已回零。判断,容量正常,无漏电,是好电容器。其他型号万用表可照此方法加电容刻度。

  很多有用到传感器的朋友,会遇到三极管输出信号的传感器,有的是PNP,有的是NPN,还有推挽的,在接线....

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  校准的主要依据是组织根据实际需要自行制定的《校准规范》或按照《国家计量技术规范》(JJF)的要求。在《校准规范》中,组织自行规定校准程序、方法、校准周期、校准记录及标识等方面的要求。因此,《校准规范》属于组织实施校准的指导性文件。

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  在实施过程中,该公司实行领导干部包抓机制,层层签订户表改造目标责任书,严格月、周、日进度管控,并坚持周例会,及时协调解决推进中存在的各种问题,同时将党建工作融入户表改造一线主战场、为民服务最前沿,各现场还成立了户表改造党员突击队,以争创“党建+户表改造示范项目”和“户表改造党员先锋示范岗”为抓手,逐级开展“硬骨头”攻坚行动。在技术攻关方面,充分发挥专业支撑作用,一线青工利用休息日进入小区配合开展宣传和客户资料收集工作。

  界面以图形界面为主,并提供树形导航。严重应以浮动消息窗口自动弹出、并有明确提示。要求提供3D显示界面,在3D场景中以红色闪烁显示设备状态。在3D界面中,当鼠标停留在某个被对象上时,其实时信息应自动浮现,相应设备可以查询设备的详细信息,包括实时数据、历史数据、等。3D界面中应提供温度场显示,在不同的切面上以温度色谱进行实时着色显示,温度场刷新速度应快于2秒。3D界面中应提供机柜负荷分布柱形图,实时反映电流分布,当电流越限时显示颜色。3D界面应支持通过鼠标、键盘动态切换视角,进行旋转、前进后退等操作,系统应实时平滑响应。3D界面应提供动态巡视功能,可任意指定巡视路线,系统自动进行实时平滑巡视,动态展现机房的各个部位的状况。当有设备时,3D界面自动聚焦到该设备,并观察到该设备红色闪烁,持续一段时间(10秒)后,继续进行巡视,并自动将该设备加入巡视路线,即巡视路线D界面的空调应提供风扇转动,冷热媒在管道的流动等真实显示效果,反映空调的实际状态。3D界面的配电柜应有电压表、电流表反映实际电压电流参数,配电柜应有空气开关,反映空气开关的线D界面的机柜门打开应能看到内部的IT设备,并能显示IT设备的工作状态、资产信息等。3D界面当发生漏水时,应显示真实的水流,使管理人员迅速发现并排除故障。3D界面应整合资产管理功能,鼠标移到空调、UPS、服务器等设备上时,自动显示其资产和维保信息。3D显示应提供双显或多显模式,允许在3D图上设备后,在其他显示中展现该设备的运行信息及等信息。3D功能应能在远程IE浏览器中呈现与本地一致的功能。3D功能应提供真实演示版本,以展现其效率和效果,仅仅采用合成的PPT或录影进行演示,不能反映其真实功能。可以根据重要级别将同时发生的排序处理,并可以将不同的内容任意指定不同的方式,如是否记录、是否显示到界面、是否、是否、是否电话等。要求动画界面仿真设备运行。要求提供手工复位功能,某些重要数据量(如消防、门禁等)一旦发生以后,即便该已恢复,但系统任需将该数据量置为状态,直到管理人员复位按钮,确认该,同时系统记录该确认操作。要求提供重复功能,当一个经过一段时间以后,尚未处理,应再次,并级别,使通知高一级别的管理人员。要求提供设备设防撤防功能,当设备正常维修或试验时,将该设备设为撤防状态,在撤防状态,即便检测到该设备发生异常,也无需启用,直到恢复为设防状态。要求提供具体测点(如红外测点、门禁测点)的设防撤防功能,可定时或手动设置监测点的设防、撤防状态,在撤防状态,即便监测点发生异常,也无需启用,直到恢复为设防状态。此功能可避免正常上班时间或有正常维护工作时的过多。

  本川智能主要致力于高精度印制线路板的生产加工,公司建有高规格的无尘净化生产车间、先进的生产和检测设备....

  野蚕丝被为什么比桑蚕丝更保暖???野蚕在北方那么多冷的天是怎么过冬的???

  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  1.对于直接接入电路的电度表以及与所标明的互感器配套使用的电度表,被测电能均可从电表中直接读数。当电度表上标有“10×千瓦小时”或“100×千瓦小时”字样,应将表的读数乘10或100倍即为被测电能值。

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  在实现多级CIC滤波器前我们先来了解滑动平均滤波器、微分器、积分器以及梳状滤波器原理。CIC滤波器在....

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  在用到STM32定时器的更新中断时,发现有些情形下只要开启定时器就立即进入一次中断。准确。

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