| 摘要 |
A control system for controlling a magnet (70) of a magnetic sector mass spectrometer (10) comprises a magnetic field sensor (140) for sensing the magnetic field of the magnet (70) and generating an output representative thereof; a set point generator (210) configured to generate an output representative of, or related to, a desired magnetic field of the magnet (70); and a digital controller (130) configured to receive a variable digital input signal from the output of the magnetic field sensor (140) and a set point digital input signal from the output of the set point generator (210), and to generate a digital output from which is derived a control signal for controlling a current to the magnet (70) so as to control, in turn, the magnetic field thereof; wherein the control system is arranged to apply to the digital controller (130) a selected one of a plurality of different controller settings, in accordance with the desired magnetic field of the magnet (70). |
