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Công nghệ nuôi sứa cảnh ngay trong nhà với công nghệ 2016

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Understanding phase noise in signal generators

Source:  http://www.testtek.com/en/detail-info.php?id=2151 Signal generators manufacturers set great store by specifying phase noise, such that, regardless of the application, phase noise is frequently taken as a proxy of the equipment's overall performance. However, phase noise performance might have little or no affect in some applications. For example, 'close in' phase noise creates problems when the signal generator is used as a local oscillator, limiting its sensitivity or impairing bit error rate (BER) performance if used as a clock. 'Far out' phase noise, on the other hand, affects wideband communications systems by raising the noise floor and limiting the reception of poor signals. Choosing a signal generator to match phase noise performance to the requirements of the application can be difficult as manufacturers often characterise phase noise performance at different carrier wave frequencies and at different offsets from the carrier signal. ...
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What is Internet of Things (IoT)?

Source:  http://testtek.com/en/detail-info.php?id=2139 The  Internet of Things  ( IoT , sometimes  Internet of Everything ) is the network of physical objects or "things" embedded with electronics, software, sensors and connectivity to enable it to achieve greater value and service by exchanging data with the manufacturer, operator and/or other connected devices based on the infrastructure of International Telecommunication Union's Global Standards Initiative.  Internet of Things connect physically and remotely by individuals, for both public sector and private sector,  in the sense of a computer network grid, of a created electrical device that is in place, with economic benefit and potential usefulness.  Each thing is uniquely identifiable through its embedded computing system but is able to interoperate within the existing  Internet  infrastructure. Experts estimate that the IoT will consist of almost 50 billion obj...
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Five reasons why ElectroMagnetic Compatibility testing should start early

Source: http://testtek.com/en/detail-info.php?id=2141 You have built a great product that meets market demands. You are confident that it radiates little energy and is not susceptible to outside interference, yet when you reach final EMC testing stage, your product fails. This is the nightmare scenario for most of us product designers. The cost of testing was already high, but re-testing will stretch the planned budget and slow down the entire project. The misplaced confidence that has led to a failed compliance test means that design engineers need to find out why the product failed and how to fix it. To avoid this scenario, pre-compliance testing should not be considered as an add-on to the end of a project. Instead compliance testing should be built into a project from day one. In the software testing industry, there is a move to shift testing left and introduce it earlier in the product development lifecycle. Likewise, this thinking is moving to the electr...
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