Operation
9327C_002-477e-05.10
Page
25
Rule
The better the mounting of the measuring device (force
link, dynamometer) on a base structure and the firmer the
attachment of the force introduction parts – the higher is
the resonant frequency and the wider is the usable fre-
quency range. At the same time the mass mounted on the
force link must be kept low.
Most piezoelectric force sensors behave as a single-mass vi-
bration system and follow the rule:
f
n
=
m
c
2
1
f
+5%
f
n
/5
f
+10%
f
n
/3
f
+3dB
= f
+41%
f
n
/2; see sketch below.
c: Rigidity
m: Mass of the structure above the sensor
