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

<strong>Tecnai</strong> on-line help Options 150Options Software version 2High tensionPressing the High tension button switches the high tension on and off. The color of the button indicatesthe high-tension status (yellow = on). The high-tension setting is the one shown in the drop-down list boxon the right. The High tension button has three possible settings:• The high tension is enabled but off : the button is 'normal' gray.• The high tension is on : the button is yellow.• The high tension is disabled : the text in the button is gray.The high tension is enabled through the High tension enable button on the System On/Off Panel.High-tension selectionThe high tension setting is by clicking in the drop-down list box and selecting the required setting (arange of fixed settings, comprising 20, 40, 80, 120, 160 and 200 kV for <strong>Tecnai</strong> F20 and 50,100,150,200,250 and 300 kV for <strong>Tecnai</strong> F30).OperateThe Operate button switches between the Operate and Standby FEG states. The button is only enabledwhen the FEG is on.Current extraction voltageThe value gives the currently active extraction voltage (corresponding to the value displayed on theprogress bar).User extraction voltageThe Extraction voltage is set with the spin control. Spin the value to the required setting. The value of theExtraction voltage cannot exceed the Extractor limit set in the flap-out. When the Enter button is enabled(which occurs after the value has been changed by the user), the value currently displayed can be sentto the server by pressing the button (as long as the button is enabled, the server has not been updated).Extraction voltage displayThe Extraction voltage display shows the value of the extraction voltage. The value is displayed innumerical format on the left as well as in a progress bar. The progress bar always has a range of 1000Volts, changing dynamically from 2000-3000 to 3000-4000, etc. The extraction limit is shown by a redbar coming from the right.Emission currentThe FEG Emission current display shows the value of the emission current.Gun lensThe Gun lens setting can be changed with the spin control within the range 1 to 8.Flap-out buttonThe flap-out button leads to the Control tab of the AutoGun Control Panel.