Chapter 6. Preparing for Measurements
41
a) AFM head b) STM head
Fig. 6-30. Measuring head at its working position
6.6. Screening with the Protective Shield
(ISOSHIELD SYSTEM™)
To activate screening with the protective shield, click the button in the
Measuring heads control panel (see Fig. 6-31). This draws down the protective shield that
covers the measuring head and the sample to reduce exposure of the measurement system
to external noises thus improving conditions for scanning.
Fig. 6-31
Repeated click on the button lifts the protective shield and opens access to the
measuring heads and to the sample.
6.7. Adjusting the Cantilever Deflection Detection
System
For STM measurements, skip this section and proceed with initial approach (see sect. 6.8
“Initial Approach” on p. 51).
Adjustment of the cantilever deflection detection system is necessary for AFM
measurements. Proper alignment of the detection system requires that the initial laser beam
falls on the cantilever end while the reflected beam comes to the center of the photodiode
and illuminates uniformly all its quarters.
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