Delay time of detonators and propagation velocity of detonation wave in a waveguide are important for security at the time of explosions. A device for measuring the time between the two sensors' operation is developed. The main measurement problem is related to the radio frequency interference due to the explosion plasma that determines the measurement errors. In the case of great explosive amounts the line power supply controller could be reset because the electrical line represents a receiving antenna f9r the radio frequency interference. That is why a development of the battery power supply devices is needed.

In this paper are given the major points of the DSP based automatic industrial test of an analog filter, as a building part of a mixed-signal integrated circuit. The currently used methods and their advantages and disadvantages are subject of analyses. It is proposed a combined method solving the problems that have impact on the test time and cost, the accuracy, the repeatability and the standard deviation of the measurement results. Experimental results showing the advantages of the application of the method are presented.