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How do you know the Modulus value for the reference sample?
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To simplify the user experience only the “Feedback Gain” which equal to the IGain in the other SPM mode is used.
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Why there is only one gain parameter: “Feedback Gain” in the PeakForce QNM mode?
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What is the physical meaning for “Inphase”, “Quadrature” channels in ScanAsyst mode?
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DMT modulus and Deformation drift can be caused by a few reasons. On is the when the probe tip is worn or contaminated, the tip radius changes and resulting in DMT modulus drift. Another possible reason is that the Peak Force Setpoint is changed during the scanning. When the ScanAsyst Setpoint Control is turned on, the Peak Force Setpoint is automatically
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Why DMT modulus and Deformation seems to be drifting during the measurement? How can I prevent the drifting? Why does Set Point variation cause Modulus and Deformation value change? How to choose the correct Set Point for the accurate modulus measurement for “Relative” and “Absolute” method?
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What is the mechanism for the Auto Gain control, Auto Setpoint control, Auto Scan Rate control and Auto Z Limit control?
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Answered in the application notes: PEAK FORCE TAPPING (Page 2). Yes, the peak force can be negative. When the tip comes into contact with sample it first feels the long range negative attractive forces. Then the very apex of the tip is in contact with the sample and resulting positive repulsive interaction force. But the overall interaction force (summation
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Can the peak force be negative in this mode? If so, what is the physical meaning for negative repulsive force?
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Answered in the application notes: COMPARISON WITH FORCE VOLUME & PULSED FORCE MODE (Page 4-5).