一、什么是物联网？所谓物联网(Internet of Things)是指物品通过各种信息传感设备（如射频识别(RFID)、红外感应器、全球定位系统、激光扫描器等装置）与互联网连接而形成的一个巨大的网络。物联网本身并不是一个简单的网络，涉及IT硬件制造、软件服务业以及信息处理等众多行业，能够应用于交通与物流、公共安全管理、医疗、城市管理等诸多领域。具体来说，我们可以将物联网产业链划分为物品标识、对象感知、数据处理、信息传输以及业务处理等五个环节，涉及到的关键技术条件有RFID、传感器、智能芯片、有线（无线）传输网络以及包含软硬件的业务处理系统等。因此，通过物联网，未来我们可以将世界上所有的物品都连接起来，并对远程物体加以识别与管理，从而对经济社会发展产生重大的影响。毫无疑问，物联网将成为继计算机、互联网与移动通信网之后的又一次信息产业浪潮。
2019-07-29 07:39
我有两个8590A的幸运位置，一个很好，另一个有显示问题。当将模拟输出连接到“范围”时，RF部分很好，波形符合预期。显示器的所有数字方面都很完美，但ADC的扫描功能被打破（见图）。我强烈怀疑ADC芯片有一个卡位，所以经过一些研究选择了模拟器件AD774BBD部分似乎工作正常，但同样的显示故障发生。我已经比较了设置为相同扫描等的两个分析仪之间的12位总线信息，这使我认为第9位不正确，它确实切换但仅在块中。但是我得出的结论是红鲱鱼。仪器偶尔点亮A16上的LED 4，标记为88230.该手册暗示当此指示灯亮起时ROM故障。目前我正在考虑在有缺陷的工作仪器中尝试ROM，我看不出会导致问题。根据ROM上的标签，仪器相隔一年，一个是88，故障仪器89.任何想法都感激不尽！ Bob One波形为299MHz中心，10MHz扫描。其他来自重置。 20160303_181034.jpg253.4 KB 以上来自于谷歌翻译 以下为原文I am in the fortunate position of having two 8590A's, one fine, the other with a display issue. The RF sections are fine, when connecting the analogue outputs to a 'scope the waveforms are as expected. All digital aspects of the display are perfect,but the sweep from the ADC is broken up (see picture). I strongly suspected the ADC chip had a stuck bit, so after some research chose a Analogue Devices AD774BBD part which seems to work OK, but the same display fault occurs. I have compared the 12bit bus information between the two analysers set to the same sweep etc, and that made me think bit 9 was not correct, it did switch but only in blocks. However I have concluded that is a red herring. The instrument occasionally lights LED 4 on A16 which is marked 88230. The handbook implies a ROM fault when this light comes on. At present I am contemplating trying the ROMs in my working instrument in the defective one, I cannot see that would cause a problem. The instruments are a year apart according to the label on the ROM, one is 88, the faulty instrument 89. Any thoughts gratefully received! Bob One waveform is 299MHz centre, 10MHz sweep. Other is from reset.附件20160303_181006.jpg231.7 KB20160303_181034.jpg253.4 KB
2018-09-18 16:11
