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  • Re: Some Peak Force QNM questions regarding calibration

    Hi Jerome, Please see the other post as Joop notes. It seems that you are not the only one that has lost their calibration lately. The two different ETRs are calculated at different distances from the tip apex (there are parameters in the analysis view, so you can control the distances). You should figure...
    Posted to SPM Digest (Forum) by Bede Pittenger on Fri, Feb 15 2013
  • Re: "Internal NS5 thermal tune gains have not been calibrated"

    Hi Scott, Did you recently upgrade your software or system? The thermal tune gains are stored in a file called "system.par". If you have not changed hardware, you may be able to snag the correct calibration values out of the old system.par file found in the directory with the z.exe file (usually...
    Posted to SPM Digest (Forum) by Bede Pittenger on Wed, Feb 13 2013
  • Re: Peak force quantitative nanomechanical mapping

    Every time you put in a new probe or change the laser spot alignment or change from air to fluid, you must recalibrate the deflection sensitivity. For instructions on how to calibrate, please refer to the manual. The calibration must be done with a sample that is very stiff compared to the cantilever...
    Posted to SPM Digest (Forum) by Bede Pittenger on Thu, May 31 2012
  • Re: Peak force quantitative nanomechanical mapping

    That is generally due to poor deflection sensitivity calibration. If the deflection sensitivity is too large, the change in cantilever bending can be erroneously calculated to be larger than the Z piezo motion. This causes the deformation calculation to return negative numbers and will cause problems...
    Posted to SPM Digest (Forum) by Bede Pittenger on Thu, May 31 2012
  • Re: Peak force QNM, Probe calibration

    Those probes are a bit stiff for the thermal technique. I would suggest the "Sader Method" as an alternate option that might give more accurate results: http://www.ampc.ms.unimelb.edu.au/afm/calibration.html This document describes the options for spring constant calibration and the advantages...
    Posted to SPM Digest (Forum) by Bede Pittenger on Mon, Feb 27 2012
  • Re: Typical deflection sensitivity of Icon

    Deflection sensitivity depends on: The shape of the laser spot when it hits the PSD (how does the response change as a function of spot position) The length of the cantilever and how it bends along its length (since we are using an optical lever, this determines how much the spot moves) The geometry...
    Posted to SPM Digest (Forum) by Bede Pittenger on Mon, Sep 12 2011
  • Re: Q on spring constants of stiff cantilevers

    Dalia, As you correctly state, the accuracy of the thermal-tune method decreases as cantilevers become stiffer. This happens because the thermal motion decreases (kz^2/2=kbT/2) with increasing k, to the point where the motion falls below the sensitivity of the detector. This obviously happens first in...
    Posted to SPM Digest (Forum) by Stephen Minne on Wed, Dec 22 2010
  • Re: Thermal Calibration method

    Ash, There are many good references on calibration, here is one from Ben Ohler: AN094-RevA0-Practical_Advice_on_the_Determination_of_Cantilever_Spring_Constants-AppNote.pdf In general, the thermal tune calibration method takes into consideration the tip location because the method uses the measured deflection...
    Posted to SPM Digest (Forum) by Stephen Minne on Tue, Nov 30 2010
  • Re: QNM, tip radius, deflection sensitivity and spring constant

    The key is to get the calibration parms for the measurement conditions. If the coating will not effect the spring constant or tip end radius, you can do the calibration of those parms prior to coating. You cannot pre calibrate the deflection sensitivity since that depends on the laser alignment. In fact...
    Posted to SPM Digest (Forum) by Bede Pittenger on Fri, Aug 27 2010
  • Re: how to clean the raster sample

    Just learned about this product from Photonic Cleaning Technology today ( http://www.photoniccleaning.com/ ) Natalia cleaned this very dirty grating in about 15min. Optical images below: Before: After:
    Posted to SPM Digest (Forum) by Stephen Minne on Thu, Jun 10 2010
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