[Spm] setpoint drift

[Beauvais, Muriel]

Dear Colleagues

 

When doing friction experiments in water with a Nanoscope 3a (Digital Instrument), I adjust the setpoint with the force calibration command before increasing the contact force of the tip (silica sphere of 5µm in diameter) on the sample (hard oxide). A continual drift in the setpoint value appears during the measurement. How could you explain this drift?  How can I be sure that for each experiment, same loads are applied to the surface?  

 

Thank you very much

 

Muriel Beauvais

 

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