Stereo Scan 440 - DCU

Now that the stage has been correctly positioned over the S1EM detector it is
now simply a case of providing the correct SEM operating conditions to provide
good S1EM imaging for the sample being investigated. Typical working
conditions would be
kV
IProbe
WD
20-40kV
5-5OpA
5 - 12rnm (WD is limited by the height of STEM Detector)
All of these parameters depend on the type of work being undertaken and the
resolution required.
The next step is to select the QBSD detector (the SlEM is a BSD variant using
the same input into the SEM) from the Select Signal A in the Detector pull down
panel selected from the Men" Line, and to ensure that the SlEM detector diode
quadrant configuration has been set correctly which is as follows :-
Ql = OFF Q2 = INVERT Q3 = NORMAL Q4=OFF
To achieve STEM imaging all that is now required is to set the Brightness and
Contrast settings to provide the correct video levels for your sample.
2.5 Specimen Current Monitor
The Specimen Current Monitor (SCM) is both a specimen current measurement
tool and an imaging device that can also provide an image of absorbed current
from a sample. It is mounted on the left hand side of the chamber and connects to
the specimen contact feed through on the stage door in place of the specimen
touch alarm cable.
Operation
Image Mode
Select the Specimen Current panel from the Detector menu (not
available on software version VO2.0l). Alternatively, select the
following from the Status! menu - SCM mode, SCM range, SCM
Image, SCM Measure and Specimen I.
2. Obtain a secondary electron image and bring it to focus.
3. Select SCM from the Select Signal A field in the Detector menu
Stereoscan 440 Operator Manual