Operation Manual

MyotonPRO User Manual
Page 104 of 108
Appendix 2 – The formulas and Legend of the
Acceleration Graph
Frequency [Hz]:
F = f
max
from signal spectrum (FFT)
Dynamic Stiffness [N/m] :
S = a
max
∙ m
probe
/ ∆l
a
max
= a
1
max displacement
m
probe
= probe mass
Ratio of relaxation time to deformation
time:
C = R / (t
1
– t
T
)
Logarithmic Decrement :
D = ln (a
1
/ a
3
)
Mechanical Stress Relaxation time [ms]:
R = t
R
– t
1
Figure 5