JEOL JSPM-5200 Instructions Manual page 191

５ MEASUREMENT OPERATION
6.
Click on Auto Configu
The Lock-in-Amplifier will adjust the phase and gain automati
7.
Increase the input sensitivity of the lock-in amplifier (from 1 mV to 100 nV
direction) using the Sensitivity setting key (▼) in the range in which the
signa
8.
To start scans, click on the Repeat button of the Advanced tab in the SPM
Parameters window.
The following images will be obtained.
The area in which Asinφ (friction image) becomes white is the one in which
friction is large.
9.
Specify the SPM parameters for usual operation so that you can obtain an
optimum topography image.
10.
Change the following parameters so that you can obtain an optimum friction
image.
• Oscillation level (OSC Level/V)
5-128
re in the Lock-in-Amplifier window.
ls from the lock-in amp
When using Model 5110 and the signal becomes saturated, the OLVD LED
lights up.
Oscillation level depends upon the scan range.
In this system, if the maximum sca
will be applied to the scanner. Therefore, there is the following relationship be-
tween the scan range and the voltage applied to the scanner.
Observatio
− =
Vp p
128
(It is difficult to determine an exact Y sensitivity, since you have to execute dis-
tortion correction. However, the Y sensitivity can be estimated all the observa-
tion range/300 V.)
In practice, the output value is a little smaller than the calculated one, because a
low pass filter is contained in the high voltage amplifier. In lateral modulation
FFM, set an excitation voltage to lateral amplitude of several nm to several tens
of nm of the voltage applied to the scanner.
The voltage amplitude applied to the scanner is 20 ti
tude input to the ADY. To obtain exact Y/20, use the optional oscilloscope.
lifier do not saturate.
Acos φ
Topography
(Topography
image)
Asin φ
(Friction
image)
n range is scanned, the voltage of 300Vp-p
n range
÷
Y Sensitivi
cally.
÷
ty 15
mes larger than the ampli-
TMPM5200-2