0762013.1 Basic principles of calibration and final test 13.1.1 Purpose of calibration and final test Although the same model of mobile phones currently produced use the same components, there are still certain deviations in these same components. Therefore, there are bound to be differences in the mobile phones combined, but the differences are within a certain range. If they exceed the range, the mobile phone will be considered defective. Therefore, the purpose of calibration is to adjust the differences of mobile phones to the range that meets the national standard, and the final test is a check on the calibration. Because calibration cannot adjust every channel and every power level of the mobile phone, only representative (experimental test points) can be selected for calibration. Therefore, it is not certain that a mobile phone that has passed calibration is a good product. Only those that have passed the final test can be considered good. The calibration and final test procedures on our current production line combine these two parts (except for DA8 and EMP platforms). 13.1.2 Introduction to basic calibration and test items of mobile phones 1. Battcal (battery calibration): It is an adjustment to simulate the use of the battery of the mobile phone, divided into two cases (4.2V and 3.5V). The calibration of Heng9 series and Florence platform is similar. First adjust the bias value when the mobile phone battery is at 4.2V so that the voltage reading of the mobile phone is in the range of 4.2±0.1v, then adjust the battery voltage to 3.5v to see if the voltage is still in the range of 3.5±0.1v. If it is, store the bias value in the mobile phone. 2. TxCal (transmitter calibration): Different platforms have different calibration methods, but the general principle is the same. It is to adjust the power value at one or several test experience points (all power levels) through a certain method to meet the requirements of the national standard. This representation value can be a single number or a group. For example, the A6/A8 series has multiple experience points (GSM900 has 4 channels 10, 60, 105, 1000, DCS1800 has 3 channels 570, 700, 800) full power level (i.e. GSM900 has 5-19, DCS1800 has 0-15) single value, while the Heng 9 series and Florence platform have a single experience point (GSM900 has 62, DCS1800 has 698) full power level representing a group of power curves for that power level. Here is a detailed introduction to the calibration of the two PAs currently in use. 1) RF…
You Might Like
Recommended ContentMore
Open source project More
Popular Components
Searched by Users
Just Take a LookMore
Trending Downloads
Trending ArticlesMore