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Tips for the Servo Dialog Box Settings_2

Tips for the Servo Dialog Box Settings_2 - Tips for the...

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Tips for the Servo Dialog Box Settings Setpoint and Gain settings are very tip-sample dependent and will change with tip type, scan speed, scan size and surface topography. These suggestions give some general guidelines for working with the settings in the Servo dialog box. Setting Integral and Proportional Gains The I and P gains dictate how quickly the feedback system reacts to changes in deflection. The I gain setting has a much greater effect on imaging than the P gain. When the gains are set too high, the system will overcompensate to correct changes in tip deflection which will lead to “ringing” at the leading and trailing edges of features. When the gains are too low, the system will not adjust the tip quickly enough for that scan speed, blurring the topography. To adjust the I and P Gains, observe both Topography and the servo input signal (Deflection or Amplitude) in the Realtime Images window. Look for rapid response and quick settling in the Topography data and oscillations in the Servo Input signal to help fine tune the Gain settings. - Observing Trace and Retrace scans in the Topography image can indicate how well the tip is tracking the surface while scanning. Adjust the Gains and Scan Speed so that the tip tracks the surface the same in both scan directions.
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