Tecnai on-line help manual -- Options - UT Southwestern

<strong>Tecnai</strong> on-line help Options 140Options Software version 210.6 AutoGun (Supervisor) – (Thermionic)The AutoGun Control Panel provides functionality to control theelectron gun and related functions that are required to switch'light' on or off on the microscope. It combines functionality fromthe high-tension, filament, alignment and vacuum controls.Note: The AutoGun control panel covers a major part of the functionality of the normal Filament(Supervisor) and High tension (Expert) control panels (and has more). It is suggested that youremove these control from your user interface setup and insert the AutoGun control panelinstead.The functionality not covered is that related to the ability to set the high tension to other valuesthen the preselection (Free High Tension control).LightThe Light button starts the procedure to make light:• Check high tension status and switch high tension on if needed.• Check the status of the filament and switch it on if needed.• Check the status of the Column valves and open these if needed.• Switch to a low magnification in the HM range with suitable illumination settings.If the first three conditions are fulfilled the button is yellow. If it is impossible to attain 'Light', the statuswill display why.When the yellow Light button is pressed, the light is 'switched off'. In the case of the FEG this means thatthe column valves are closed.When the make light (or switch off) is active, the button will be orange (a transitional status).AlignThe Align button starts or stops the alignment procedure selected from the drop-down list on the right.The color of the button indicates whether the procedure is active (yellow).Note: The gun-tilt pivot points can be difficult to align (especially on FEG microscopes) because thebeam moves when the pivot points are changed. AutoGun has a special feature that will detect thechange in pivot point and automatically compensates the gun-deflection settings to keep the beamcentered. This makes the alignment of the gun tilt pivot much easier. You do not have to activateanything in AutoGun, just make sure it is in the user interface.StatusThe status label provides feedback on status and operation of the AutoGun functionality.