Selection Of Components - HBM CMD Serie Bedienungsanleitung

Tips for piezoelectric measurement technology
74
loaded with a bending moment of 100 Nm, this produces
an output signal of -2.3 N.
The potential overload of the measuring element is par­
ticularly problematic. So please note the maximum lateral
force stated in the data sheet.

14.6 Selection of components

A piezoelectric measuring chain consists of the actual
transducer, the charge amplifier and the connection cable
between the components.
If the maximum force to be measured is known, you can
select a suitable charge amplifier and measuring range.
The transducer can be designed according to the maxi­
mum overload and the geometric requirements, as the
output signal is not dependent on the maximum capacity.
Example 1: force transducer
A maximum force of 15 kN is to be measured.
S Select a force sensor with a full scale value of 20 kN,
such as the CFT/20 kN with -7.7 pC/N sensor sensi­
tivity.
S Enter the unit kN in the CMD Assistant via Display ->
Unit.
S Enter the transducer sensitivity 7700 (pC/kN) in the
Sensor sensitivity field in the CMD Assistant. (The
minus sign of the transducer sensitivity is not
entered.)
S Enter the measuring range 15 in the Physical input
range field in the CMD Assistant, the display shows
the most suitable value to have been set: 14.99919.
A2781-3.1 HBM: public
CMD