TMPM5200-2
5-71
ing so
adjusts the sensitivity and phase of the lock-in amplifier automatically.
7.
Increase the input sensitivity of the lock-in amplifier using the SENSITIVITY
setting key in the range in which the OLVD LED does not light up (from 1 mV
to 100 nV direction).
8.
Click on the Repeat button to scan the specimen.
The following display will appear:
Click on Auto Configure in the Lock-In Amplifier window in the case of Model
5110, and on Auto Sensitivity and Auto Phase in the case of Model 7265. Do
Topography
(Topography
image)
Acos
φ
(Elasticity
image)
Asin
φ
(Viscosity
image)
The region where both Acos
φ
(elasticity) and Asin
φ
(viscocity) images become
bright is the region where elasticity and viscosity are high.
9.
Specify the SPM parameters for usual operation so that you can obtain an
optimum topographical image.
10.
Change the following parameters so that you can obtain an optimum
elasticity image as well as an optimum viscosity image.
•
Oscillation frequency (OSC Frequency/kHz)
If the difference between elasticity and viscosity of the specimen is small as in, for
example, composite plastics composed of related materials, it is expedient to
increase the oscillation frequency. Doing so might provide better images.
•
Oscillation level (OSC Level/V)
When you use hard cantilevers such as an Si cantilever, it is recommended that
you use a low oscillation level to observe the image. If the oscillation level is too
high, the cantilever may be broken. When you use soft cantilevers, however,
increase the oscillation level accordingly. Generally, there is a tendency that the
harder the cantilever, the better the results for viscoelasticity image observation.
