9
KolibriSensor
V2.0 | June 17, 2014
Note
By narrowing the frequency range or increasing the number of data points it is now possible to
obtain a higher resolution characteristic in order to accurately measure the Q factor of the
KolibriSensor.
7. Either narrow the frequency range or increase the number of data points to obtain a higher
resolution characteristic. Make sure that the Q factor does not change significantly as you
further narrow the frequency range—this ensures that you have found the correct value.
Figure 8: Altering the sweep range or number of points
8. Press
Apply
next to the row of values in the table in the
Frequency Sweep
panel. This will
transfer the resonance frequency, the Q factor and the A/U_exc (amplitude/ excitation)
ratio to the Oscillation Control and PLL Setup views.
Figure 9: Sending values to the PLL Setup view
9. Enter the following in the PLL Setup view:
Amplitude Controller BW
: 50 Hz
Phase Controller BW
: 50 Hz
Note
FM-AFM measurements may require amplitude controller and phase controller bandwidths to
be optimized according to specific requirements. The values indicated above may serve as a
starting point.