Instruction manual

Calibration, Maintenance, Troubleshooting and Warranty
Calibration of “A” Scanners for Atomic-scale Measurement
Rev. B MultiMode SPM Instruction Manual 307
3. Engage the surface and adjust the Integral gain and Setpoint to obtain a good image. Keep
the Setpoint low if possible, and the Z Center Position close to 0V. Notice that the Scan
rate is set much higher (~ 61 Hz) for atomic-scale images, this to defeat some of the noise
due to thermal drift.
If difficulty is experienced obtaining an image, Withdraw and try a different site on the surface,
then Engage again. Many users find it easiest to obtain good image measurements if the sample is
rotated until atoms are oriented vertically.
4. After obtaining a satisfactory image, Capture it. The image should appear similar to the
image of graphite shown below. The captured image will be used for the calibration
procedure described in the next several steps.
Figure 15.9a Typical atomic scan of graphite. Note the highly regular lattice of the atoms. The cursor line
describes a distance of 6.66Å.