| 摘要 |
<p>A method of switching between two modes of power supply to a mass analyser is provided. In a first mode of operation, operated for a first predefined time duration, a first power supply, coupled to the mass analyser, generates a first non zero potential, whilst a second power supply, disconnected from the mass analyser, generates a second non-zero potential. In a second mode of operation, operated for a second predefined time duration, the second potential is coupled to the mass analyser, whilst the first power supply, disconnected from the mass analyser, generates the first potential. These predefined time durations are selected such that only one of: the first potential; and the second potential is coupled to the mass analyser at any time, and such that the first and second modes of operation are carried out at least once within a predetermined length of time.</p> |
