Fig. 5

Calibration measurement. The abscissa represents the force exerted by certified weights. The displacements d₁ and d₂ of the two sensor axes are plotted as well as the magnitude of their calculated vector sums \(d = \left |\vec {d_{1}}+\vec {d_{2}}\right |\). The slope of the regression line for the vector sums yields the calibration constant k=23.4 N m ⁻¹. Note the different slopes of the lines for two sensors, which result from a small rotation of the calibration setup about the cantilever axis; this small misalignment has no effect on the vector sum, the (calculated) misalignment angle is approximately 3°