JEOL JSPM-5200 Instructions Manual page 300

• Beat Noise
Frequency detection in the FM mode is executed in the frequency-detection circuit
of AFM AMP using PLL (Phase Lock
with relatively low frequency (of 1 kHz or less) occurs due to the correlation
between the signal frequency and the characteristic frequency of the frequency
detection system (PLL).
In such a case, checking the Beat Noise check box will remove the beat noise by
slightly changing the characteristic frequenc
(PLL).
• Q
Factor/Peak Frequency/kHz
When you have performed a frequency scan, if the resonance frequency (peak
frequency) of the cantilever and Q factor are detected, each detected value will
appear here.
• FMD Value indicator
The outputs of the present FMD signal (FM detection signal) will appear. The
displayed value is the same as that appears on the LCD of the AFM AMP front
panel.
• Tuning
The parameters in the Tuning frame are used for searching for the resonance
frequency of the cantilever.
• Start Frequency/kHz
• Stop Frequency/kHz
• Phase Display
•
No
When Normal S
When Autotune is select
When Phase Scan is sel
• Scan
• Filter
• High Pass Filter/kHz
• Low Pass Filter/kHz
TMPM5200-2
Specify the start frequency of the frequency sweep in this input box.
Specify the stop frequency of the frequency sweep in this input box.
Checking the Phase Display check box acquire
frequency scanning.
rmal Scan/Auto tune/Phase Scan
can is selected:
Clicking on the Scan button performs the frequency sweep once from the start
to the stop frequency. Detected peak frequency and the Q value appear after the
measurement.
ed:
Clicking on the Scan button starts the automatic adjusting sequence.
ected:
Click ing on the Scan button performs the phase scan, and adjusts the phase
control of the frequency detection circuit to the optimal condition for perform-
ing frequency detection.
Starts frequency scanning using the method that is selected from the above scan
types.
High Pass Filter/kHz has the same function as that of the AC/Phase tab win-
dow.
Low Pass Filter/kHz has the same function as that of the AC/Phase tab window.
５ MEASUREMENT OPERATION
ed Loop). In the PLL circuit periodical noise
y of the frequency detection system
s and displays phase data during
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