SEM Quick Start
Revision No.2
May 2014
Page 15 of 16
1.5
Logging Off
Finishing a session with the microscope is roughly the reverse of the
startup process. The following sections will briefly outline the steps to safely log
off the instrument.
1.5.1
Stage Positioning and STEM Detector
The first steps to safely logging off the instrument involves
stowing the stage and disabling the control sticks. To begin, switch the
detector channel to TV (Section 1.3.1). If the STEM stage was used, move
it to the stage point labelled
$STEM_SAFE_ZONE
using the Stage
Points List tool found in the docking side-panel (Section 1.4.1). Once in
the safe zone, retract the STEM detector by clicking the
STEM -> OUT
button found in the
STEM Control
tool found in the docking side-panel
(Section 1.4.1). If a normal SEM stage was used during the session,
completely lower the stage using the left control stick on the
SEM Stage
Control
board. Once the stage has been stowed, the operator
must
lock the
stage controls by enabling the
Joystick Disable
checkbox under the Stage
tab. This helps minimize the chance of someone inadvertently moving the
stage while the microscope is not in use.
1.5.2
Accelerating Voltage
After safely stowing the stage, the operator must ramp down the
accelerating voltage to a low value before disabling the EHT. It is
common to lower the voltage to
2.0 kV
or lower, while remembering to
change in increments no larger than
5 kV
. Once the accelerating voltage is
sufficiently low, EHT can be disabled by clicking the
EHT
textbox at the
bottom right portion of the screen.
