万用表又称为复用表、多用表、三用表、繁用表等，是电力电子等部门不可缺少的测量仪表，一般以测量电压、电流和电阻为主要目的。如何使用万用表是很多对万用表不熟悉的朋友*关心的问题，万用表可以用来解决很多问题，我们就简单的介绍一下万用表的基本使用和解决照明线路漏电问题时的使用方式。万用表的使用方法：使用前应熟悉万用表各项功能，根据被测量的对象，万用表正确选用档位、量程及表笔插孔。在对被测数据大小不明时，应先将量程开关，置于值，而后由大量程往小量程档处切换，使仪表指针指示在满刻度的1/2以上处即可。
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光纤光栅传感器在这一领域中的应用主要是在岩石变形、垂直震波的检测以及作为地形检波器和光学地震仪使用等方面。活动区的应变通常包含静态和动态两种，静态应变(包括由火山产生的静态变形等)一般都于与地质变形源很近的距离，而以震源的震波为代表的动态应变则能够在与震源较远的地球周边环境中检测到。为了得到相当准确的震源或火山源的位置，更好地描述源区的几何形状和演变情况，需要使用密集排列的应力－应变测量仪。光纤光栅传感器是能实现远距离和密集排列复用传感的宽带、高网络化传感器，符合地震检测等的要求，因此它在地球动力学领域中无疑具有较大的潜在用途。
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PV040R1K1T1NKLC
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PV040R1K1T1NMMC
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PV040L1L1T1NFWS
PV040R1K1T1NMLC
PV040R1D1T1NGCC
PV040R1K1T1NELA
PV040R9K1T1NMMCK0188
PV046R1K1T1N001
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PV046R9K1T1NMMC
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PV046R1K1T1NMMCX5934
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PV063R1K1A1VFPR
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PV063R9L1T1NFWS
PV063R1K1A1NFHS
PV063R1K1T1NFFP
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在近场区查找辐射源可以直接发现干扰源。在近场区查找辐射源的工具有近场和电流卡钳。检查电缆上的发射源要使用电流卡钳，检查机箱缝隙的泄漏要使用近场。电流卡钳与近场电流是利用变压器原理制造的能够检测导线上电流的传感器。当电流卡在被测导线上时，导线相当于变压器的初级，中的线圈相当于变压器的次级。导线上的信号电流在电流的线圈上感应出电流，在仪器的输入端产生电压。于是频谱分析仪的屏幕上就可以看到干扰信号的频谱。
