| 摘要 |
FIELD: radio engineering; measurement equipment.SUBSTANCE: invention can be used in radio-measurement and simulation equipment intended, in particular, to determine noise coefficient of different devices and their calibration. Device includes an output signal extraction unit (1) connected to power supply circuit (2) connected to switching unit (3) operating in the mode of accidental closure of its electrodes. Switching unit (3) consists of two electrodes (4 and 5) included in the process of operation in contact with current-conducting layer is forcibly moving metalized film (6). First electrode (4) is made in the form of a roller freely rotating about its axis, and the second electrode (5) in the form of the point of the contactor. Generation of output signals are switching power supply source by direct or alternating current (2) electrodes switching unit (3). When voltage on electrodes (4 and 5) is closure circuit through metallised film layer. Due to difference in areas of contact electrodes with a surface film of current density nearby the point of contact of the second electrode (5) is many times greater than the current density near the first electrode. When current density value exceeding critical occurs spark breakdown current-conducting film layer, resulting in instant opening circuit. Due to objective with place of non-uniformity of thickness of conducting film layer centres of its destruction are randomly placed areas with minimum thickness.EFFECT: higher effect of stochasticity of frequency characteristics of electromagnetic radiation and high bandwidth emitted frequencies.1 cl, 2 dwg |
