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Figure 184 Final test station The final test station is generally an equipment rack and, in the case of mobile test, will include: a cellular test set to establish a call with the mobile and make measurements, a computer to control the test station, a power supply to power the mobile, and display and printing devices for measurement results
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Quality assurance When the final test is complete, theoretically the mobile or BS is ready for packing and shipping to the customer Most manufacturers do perform a certain amount of QA testing on a portion of their products, however The QA test process will normally be a more extensive version of the final functional test, perhaps taking more measurement points or testing on more channels Because mobile network service providers often inspect newly manufactured mobiles or base stations, the manufacturer attempts to simulate this incoming inspection test to give a high degree of confidence that products will not be rejected by the customer Faults found at the QA stage indicate serious defects in the manufacturing process and need immediate investigation to prevent the creation of further faulty units In many cases, failures at final test and sample QA arise from measurement problems rather than any real defect in the mobile or BS In some instances, problems are caused by poor accuracy and repeatability in the test equipment being used Even if manufacturing test software has been carefully designed to catch all product defects at pretest, it still is possible for poorly specified test equipment to fail good units later in the process 1834 Specification budgets
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A specification budget is a listing of the uncertainties in each measurement a piece of test equipment can make, such as how accurately it can measure power or frequency This usually is obtained from the instrument data sheet If properly specified test equipment is used at each stage of the production process, the budget can be used to calculate testing pass/fail limits for each stage of the manufacturing process These
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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
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Cellular Measurement Strategies Cellular Measurement Strategies 401
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limits directly affect the number of mobiles that pass the final test with a high degree of confidence that they will meet their design specifications This is known as the process yield Using a specification budget ensures that failures occurring at final test and sample QA do not result from measurement problems The specification budget can be used during the design of a manufacturing line as a tool to help select test equipment Figure 185 illustrates the principles of a specification budget Budgets sometimes are single-ended (as shown), often symmetrical (simply add a reflection of the diagram to the left of the page), and occasionally asymmetric The room temperature specification usually is the value determined by the regulatory authorities controlling the standard In the case of GSM900 mobiles, one example would be transmitter output power, which for most levels has to be within 3 dB of the nominal value This specification is driven by the ETSI GSM 0505 (ETS 300 577) specification for the RF interface The full environmental specification is generally looser than that for room temperature ( 4 dB in our example) and is also found in the GSM 0505 specification The exact environmental conditions of temperature, humidity, and vibration are also specified in ETSI documents To pass Type Approval, the mobile must be capable of meeting both the room temperature and the full environmental specifications If a particular manufacturer s environmental drift is greater than that anticipated by GSM 0505, it will be necessary for the manufacturer to tighten the manufacturing room temperature specifications to ensure all mobiles, if tested, could meet the full environmental specification The value for environmental drift will have been obtained from a sample of mobiles tested during the development phase The manufacturing test pass/fail limit is used to reject unacceptable mobiles during the manufacturing process It is calculated from the room temperature specification by subtracting the measurement uncertainty Measurement uncertainty is determined
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Figure 185 Specification budget to set manufacturing test limit There will be a natural spread in the performance of manufactured products, caused by component tolerance variations The measurement uncertainty affects where the manufacturing test line limit is set It is important to guarantee passing the full environmental and room temperature specifications A bigger measurement uncertainty means that for a given spread of product performance, fewer are guaranteed to pass
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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
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