| 摘要 |
PURPOSE:To prevent the collection of unnecessary data, by holding the emitter current when the considering ion peak will exceed over free setting then starting the data sampling of a data processor on the basis of their output. CONSTITUTION:Prior to the starting of measurement the mass peak number and the data sampling times are previously stored, and when reaching to said stred mass peak number a hold signal is provided from a data processor 17 to a field desorption power source emitter current control circuit 50 to hold the current supply to an emitter 1 constant by said signal, while only the mass specter at this time is sampled to the data memory area thereby the operator can sample only the required mass specter to the data memory in the data processor 17 without monitoring the mass peak. In the drawing (12) is an ion source, (13) is an electric field, (14) is a magnetic field, (15) is a hole element and (16) is a detector. |
