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

<strong>Tecnai</strong> on-line help Options 66Options Software version 2A Random scan is a scan where the software calculates grid-holepositions on the basis of random moves in the X,Y direction. In this way itis possible to remove operator bias from the procedure and thus toreduce the number of grid holes that must be scanned for statisticalconfidence.Each hole passed is based on a random selection of X and Y position.Movement from one hole to the next is outlined by the red line andarrows.Scan typeThe Scan type can be either manual or automatic. In manual scan, the operator must command thesoftware to move the specimen stage from one hole to the next. In automatic scan, the software waitsuntil the delay time has passed and then moves the stage to the next hole.OptionsRelocatable gridA Relocatable grid is a specially shaped grid that has an asymmetric 'ear'that fits into the single-tilt specimen holders delivered since 1993. The 'ear'takes care that the grid can be loaded into the specimen in only one way,without rotation and very little sideways movement. The relocatable grid thusmakes it easy to remove specimens from the microscope holder and puttingthem back in and still retrieve stored locations easily.If relocatable grids are used, switch on the option under Control Options.Grid Scanning will then make it possible to drive back directly to the oldlocation of the first reference point which should be very close to the currentlocation of that point.Use labelsThe label refers to user-written comments (up to a maximum of 100 characters) than are stored togetherwith stored locations. If Use labels is checked the software will bring up a dialog allowing insertion of thelocation label.Use hyperlabelsThe software provides a special feature in the form of hyperlabels (labels that act like hyperlinks: whenthe cursor moves over them they flash their color to blue and a mouse-click brings up a dialog withinformation about the point, with additional functionality such as Go to or Delete).Use Function keysFunction keys can be used in addition to menu commands to control Grid Scanning. The followingfunctions are used:• Up, down, left, right arrows in cursor scan (these have no menu equivalent).• F4: Add location• F6: Next hole• F8: Previous hole