Abstract:The concept of signal distortion measurement is introduced in this papre and some technical features are discussed according to the classification of analog and digitizing method. Some key problems and study hot points are analyzed. The research trend of the degree of distortion is presented as well.

Abstract:In the paper, the Neural Network model of metal content mainly monitored in the lubricating oil monitoring system of aeroengine is built by the method of Neural Network. The trend of the metal's content is forecasted and ananyzed according to this model. The different practical data tested show that the result of this model can forecast the overrun of the metal content.

Abstract:The defects of the fault dictionary method in the practical application are analyzed and the application method of an unit BP algorithm which is used in the fault diagnosis of the electronic circuit is put forward. This paper validates the diagnostic technique with the example of some electronic circuit of the aero electronic equipment by computer simulation and evaluates the diagnosis results with different neural network structures and different parameters. Simulation results indicate the rationality and validity of the method.

Abstract:An auto measuring system for the thickness interpretation instrument transmission screen, using the linear CCD sensor as the detector instead of reading micrscope and using the 8253 CMOS chip to realize the auto measuring and real time displaying results, is presented. The principle and the realization of the hardware and software are discussed and the error of measurement of this system is analyzed. The feasibility and the advancede character of this system are proved and it has upper practical value and application prospect.

Abstract:In the paper, a digitalization ground testing system with two pieces of PIC18F448 microchips and its peripheral devices is designed. Through I 2C Bus, the two microchips are coordinated and the tested data are transmitted. Using its CAN interface module,the network and remote control multi sets of ground test systems are realized.

Abstract:According to the principle of measuring spacious point by laser tracker and through "move station" the coordinate system is established. The "cloud point" of the aeroplane outline is collected. The data are processed and the methamatics model is established.

Abstract:In this paper, a new method of AC voltage measurement based on the combination of ADC card and correlation analysis technology is discussed and the practical illustration is also given.

Abstract:The flight parameter record system is an important equipment. Using the method of function testing to design this system, the test of the flight parameters is realized and the covering rate of fault is high. The testing method is of great value to popularization for other flight parameter record systems.

Abstract:It is described that the uncertainty of evaluation results of amplitude of square wave, including the courses of analysis and evaluation of uncertainty of it. Some error sources of amplitude evaluation are discussed, including the amplitude measuring error, the effect of the range of the mode of the density distribution method, and the others. The uncertainty of amplitude of square wave is given out, and several main methods of decreasing the amplitude evaluation errors and evaluation uncertainty are proposed. In an example of experiment, the analysis and uncertainty evaluation results of amplitude by using the method are presented in this paper.

Abstract:Verifying the horizontal and vertical scales of the theodolite by the verification instrument with reference, the component composition of the uncertainty of angle measurement and uncertainty evaluation are presented in this paper.

Abstract:The uncertainty of evaluation results of stopwatch calibration by standard time generator and the courses of analysis and evaluation of uncertainty of stopwatch calibration are described in this paper. Some error sources of stopwatch calibration evaluation are discussed. Through a group of examples of experiment, the analysis and evaluation results of stopwatch calibration and its uncertainty by using the method in this paper are presented.

Abstract:Humidity as a circumstance parameter is a very important parameter norm not only in science fields but also in industrial production. In concret application, owing to the different requirements of unit and range of the humidity for different units, we have compited the "Software Package for Humidity Conversion". It makes the conversion among the different parameters and units of the humidity could be done. This paper introduces the key functions of the software, explanation of use and the situation of data contrasted with foreign similar software.

Abstract:根据国防科工委《计量标准考核评审表》的条款要求，结合参与对企事业单位最高计量标准考核(复查)的经验，提出了国防科技工业企事业单位最高计量标准考核(复查)的评审要点。