Researching On The Control Of RF Power Error Variance From Hand Phone Test Bay

RF PATH (Radio Frequency Path), which is on Hand Phone Test Bay, includes RF Probe,3dBm Attenuator, RF Cable, RF Relay and Test Set. It creates some RF Power Lose while RF signal transfers along it. The RF Power Lose must be compensated during Hand Phone being produced and tested. The value of RF Power Lose can be measured with Net Analysis instrument and Calibration Cart, and the variance of the Lose Value can be checked if it is out of control tolerance by using Correlation Radio.The accuracy and precision of Calibration Cart is very important for RF PATH to be sure of the accuracy and precision of its Power Lose. So, it is very necessary for measurement system to have a judgment criterion to make a decision whether Calibration Cart is ok or not. According to the theory of measurement system analysis, Every standard deviation of the measurement result, from relative factors, can be calculated by using statistical method, and produces basis for the judgment. Application Software MINITAB can also help us to make the analysis automaticallyResearching into the RF Power Error Variance of Hand Phone Test Bay means to find out the root cause of the Variance through taking a full-scale and detail study. Being aimed at the good control of the Variance, solutions are put forward and to make the issues closed.Dynamic Correlation Monitor System (DCMS) is a new correlation system concept. It uses the Multiple Comparisons of Statistical Method to analyze the collected data of Test Ports in one production line, and give out which port is abnormal, and then inform technician to take actions, such as Doing Correlation, Changing Fixture. Or doing Calibration, and so on. The New Correlation way may take place of the current method to avoid doing correlation and calibration every day . It is very useful for manufacturer to improve the economic benefit.