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to find severe defects as early as possible in the test process Faults like completely nonfunctional integrated circuits and missing components ideally should be identified at the pretest stage, where they can be replaced most easily A certain amount of calibration may take place at pretest, though usually most of this is done at final test due to the influence of external coverings on sensitive RF circuitry Pretest usually is fully automated, with a manual rework loop to correct any identified faults There are two basic strategies for pretest, illustrated in Figure 183 Mobiles generally are manufactured using either strategy, but base stations tend to be manufactured using strategy 2 Pretest Strategy 1 This is a top-down approach, which starts from the assumption that the circuit board is likely to be working An integrated cellular test set is the ideal choice of test equipment for this strategy An attempt is made to establish a call with the basic mobile circuit board and measurements are made with wide limits The test development time with this approach is quick because much circuit board functionality is implied by the fact that it can operate well enough to establish a call The type of measurements carried out on the transmitter module are carrier power, modulation quality, and (in digital TDMA systems) power versus time The receiver sensitivity or bit error ratio in digital mobiles also may be checked During testing the mobile is controlled using over-the-air signaling from the test set Measurements are made either at the mobile antenna connector or accessory connector What is looked for in pretest is functionality and adjustability This technique has the advantage that it is reasonably easy to implement, and a large portion of the circuitry is exercised and tested in the process of establishing a call Pretest Strategy 2 The second method of implementing pretest uses discrete test instruments such as spectrum analyzers, voltmeters, and signal generators. .net upc-a reader . NET Barcode Reader Library | C# & VB. NET UPC-A Recognition ...
Guide C# and VB. NET users to read and scan linear UPC-A barcodes from image files using free . NET Barcode Reading Tool trial package. .net upc-a reader . NET Barcode Scanner | UPC-A Reading in . NET Windows/Web ...
How to scan and read UPC-A barcode image in . NET windows and web applications using Barcode Reader Component for . NET ; provide APIs for various . NET ... Figure 183 Pretest options A cellular test set offers a quick, easy way to check if a circuit is working The fact that it operates gives a high degree of confidence that it will be able to be calibrated into a final-quality unit Discrete instruments offer superior flexibility because there is no dedicated protocol built in, as there is in the cellular test set The flexibility is offset by the fact that each section of the circuit board has to be tested individually, which slows the test development process This package shown in Figure 16 - 16 is a simple mailer, with no graphics or text It is suf ciently robust to withstand the rigors of snail mail Downloaded from Digital Engineering Library @ McGraw-Hill (wwwdigitalengineeringlibrarycom) Copyright 2004 The McGraw-Hill Companies All rights reserved Any use is subject to the Terms of Use as given at the website birt upc-a, word code 128 barcode font, word ean 13 barcode font, birt pdf 417, gs1-128 word, birt code 128 .net upc-a reader UPC-A . NET Control - UPC-A barcode generator with free . NET ...
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The Universal Product Code ( UPC ) (redundantly: UPC code) is a barcode symbology that is .... read UPC -like labels with his ring wand. In addition to reading regular labels, he read the large two-page centerfold label in the proposal booklet. These typically are set up in a 19-inch rack that also houses a power supply and a computer to automate the measurements This is a bottom-up approach that assumes no circuit components to be working and checks each part of the circuit separately Test development is usually slower, as there is a need to test each section individually RF signals and voltages are injected at various circuit test points and the responses measured using a spectrum analyzer and voltmeter This process closely mirrors the way the circuits were designed on the R&D bench, only now the process is automated This technique has the advantage that it allows manufacturing flexibility; many different boards can be tested with a basic set of equipment, simply by changing the fixturing and control software This has to be traded off with the complexity of testing separately each part of the circuit board and not seeing how it all performs as a whole Because simulating a network of mobiles is difficult, this second method is more commonly used in base station pretest The mobile or BS under test is controlled by an external computer connected to a special test bus In the case of a BS, the test bus may be a restricted functional simulation of the real-life base station controller Once the product has passed the pretest stage, it moves on to final test At final test, full calibration is performed and functionality is checked Because RF components are prone to being affected by their immediate surroundings, the raw circuit boards are usually assembled into their final cases before final test commences .net upc-a reader C#. NET UPC-A Barcode Reader /Scanner Library | How to Read ...
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