Automatic testing system for flaw detector

The internal field detection equipment and external field comprehensive detection equipment included in the automatic test system have perfect self-test functions, which completely cover their detection parameters. The self-test test accuracy is also equivalent to the detection accuracy. The metrological calibration idea based on the self-test process is completely feasible. The basic principle of the calibration system design based on the self-test process is shown in Figure 1. Here, we divide the signal in the self-test cable into source signal and test signal. The source signal is the working condition or analog signal source provided by the detection equipment, that is, the excitation, which makes the equipment or self-test circuit work; and the test signal is the signal output by the tested equipment or self-test circuit, that is, the response.

In-situ calibration is to treat the test system as an integral unit with test function, define a unified metrological calibration process and calibration cycle, and perform it at the original working position of the system. The main advantages of in-situ calibration of motor test instruments are: the calibrated parameter characteristics are the UUT test requirements, achieving the highest measurement integrity of the test system; calibration can be carried out in its actual working environment, realizing the authenticity of the calibration work; it can be completed through calibration TPS control, the system calibration is fast and easy, with a high degree of automation and a short calibration time.

The basic feature of the new generation of automatic test systems is that they are based on virtual instrument technology and are centered on PCs. Obviously, off-site calibration is difficult to meet the measurement needs of military automatic test systems and has great limitations; in-situ calibration can meet the calibration needs of military ATS and comprehensively and accurately measure its usage functions and test performance.

In the system's adapter chassis are adapter and conditioning module circuits corresponding to each detection equipment, which are the hub for adaptation and conversion between the test signal to be measured and the typical signal that can be processed by the instrument module. According to the objects of each independent measurement, their respective adapter and conditioning circuits are designed. The modular design makes circuit design, production, debugging, modification and operation more reasonable and convenient. Each conditioning module is further refined according to its function, generally including test signal input circuit, analog signal output circuit, standard signal control circuit, signal distribution circuit and signal conversion circuit, etc.