工作原理：基于电磁波运动学、动力学原理和现在电子技术。HC-HD85楼板测厚仪主要由信号发射、接收、信号处理和信号显示等单元组成，当接收到发射电磁信号后，信号处理单元根据电磁波的运动学特性进行分析，自动计算出发射到接收的距离，该距离即为测试板的厚度，并完成厚度值得显示，存储和传输。测试方法：发射与接收分别置于被测楼板的上下两侧，仪器上显示的值即为两之间的距离，只需移动接收，当仪器显示为值时，即为楼板的厚度。
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PV032R1K1T1WFDS
PV032R1K1AYNMTP
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从被测物体开始，每隔5～1米分别将辅助接地棒呈一直线插入大地，将接地测试线(红、黄、绿)从仪表的S、E接口开始对应连接到辅助电流极辅助电压极S、被测接地极E上。如上图简易法测量接地电阻法此方法是不使用辅助接地棒的简易测量法，利用现有的接地电阻值的接地极作为辅助接地极，使用2条简易测试线连接(即其中S接口短接)。可以利用金属水管、消防栓等金属埋设物、商用电力系统的共同接地或建筑物的防雷接地极等来代替辅助接地棒S，测量时注意去除所选金属辅助接地体连接点的氧化层，接地电阻简易测试接线如下图，其他操作同精密测量。
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PV040R9K1T1NMMCK0188
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各类电器、电子设备在城乡和到迅速普及，给生产带来极大方便。但各类电器、电子设备的广泛使用，由此带来的人身事故也大为增加。给生命财产带来危害，触电伤亡和电气火灾是常见例子。电器、电子设备的使用安全性这一重要问题，成为决定产品质量的各要素中跃居地位，安全标准成为*重要的技术标准。电气安全性能测试主要有耐电压测试，绝缘电阻测试，泄露电流测试和接地电阻测试。下面简要介绍这几种测试。耐压测试耐压测试是检验电器、电气设备、电气装置、电气线路和电工安全用具等承受过电压能力的主要方法。
