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As the iPhone sells well in the present market, its peripheral products (such as chargers, and the supporting audio and video equipments and etc.) come out more and more. Therefore, the requirements of Apple iPhone accessories testing also seem to be more and more important and urgent. In this case, Apple also update relevant standards according to the market situation of iPhone annex OTA (Over the air) test requirements. In fact, the latest requirements of the test include TRP OTA (Total Radiated Power), EIS (effective isotropic sensitivity) and IC (Relative Sensivity Intermediate Channels). iPhone-Accessories TRP test require the content to be linked to the iPhone, and do the sampling every 30 degree. Compare the testing results with the single iPhone TRP, we need to determine whether it matches the testing standard. In the TRP test, it is not required to be measured in charged state. We often meet the problems in the test as follows. The structure of the whole machine-problems: the part of the device is too close to the iPhone, such as speaker, iron nets, PCB version of position, the size of the heat sink and so on. If these devices for testing result influence,they should be removed or away from the iPhone. The size of the PCB's grounding: the size of the land for the influence of the TRP test is significant, in general, the greater the land for the valuable, the bigger TRP’ influence. The length of the connecting lines and their positioned influence: after iPhone connects the measured thing, we should make measurements according to the required angles, and it's easy to put the connections as a single antenna, which leads the worse result. Therefore, there is an urgent requirement to avoid the connecting lines of being as long as transmitting signal wavelength section; The positioned location of the connecting lines should be as far as possible from the iPhone.according to our testing experience, a little fold may have a large influence to the crease test results. iPhone-Accessories EIS test requires the measured thing to be linked to the iPhone accessories according to the requirements of the test Angle tests, you can see the test Angle via table 1. You can compare the testing result with single iPhone EIS, in order to determine whether it conforms to the test standards. In the EIS test, the requirements need the measured thing to be in working conditions. We can meet the problems in the test are as follows.
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