METHOD OF AND APPARATUS FOR PROGRAMMING PRESSURE CHANGES AS A FUNCTION OF TIME

摘要

3. Apparatus for programming pressure changes as a function of time comprising a pressure measurement unit, characterized in that in the feedback control loop it has a digital controller (6) generating a controlling variable which comprises two segments: fixed (WSP) and variable (KR), whereas the input of the digital controller (6) is connected to the output of the pressure measurement unit (5) which is connected through a pressure pick-up (1) with a pressure generator comprising a stepper motor (2) which drives an executive device (3) connected with the pressure chamber (4) and the stepper motor (2) is controlled with frequency received from the controlling unit (7) which is situated at the output of the digital controller (6) and has at its input a combination logic circuit (18), whose output is connected with the input of the power amplifier (14) powered from a programmable power pack (20) controlled by the combination logic circuit (18).<IMAGE>