Journal of Data Processing Jordan Badev, Angel Lichev and Georgi Terziyski 11 1 2021 https://doi.org/10.6025/jdp/2021/11/1/7-14 https://www.dline.info/jdp/fulltext/v11n1/jdpv11n1_2.pdf To locate and find the high order linear models, the method for organizing experiments and to collect the required data is important. We perform the experiment with the help of a controller in the closed loop. We have used the frequency characteristics for collecting the variables with the performing mode values.