Structure And Mode Of Operation; Transducer; Strain Gage Covering Agent - HBM C2 Notice De Montage

5

Structure and mode of operation

C2
5.1

Transducer

The measuring body is a stainless steel loaded member,
on which strain gages (SG) are installed. The effect of a
force deforms the measuring body, so there is strain in
places where the strain gages are installed. The SG are
attached so that four are extended and four are short­
ened when a force is applied. The strain gages are wired
to form a Wheatstone bridge circuit. The SG change their
ohmic resistance in proportion to their change in length
and so unbalance the Wheatstone bridge. If there is a
bridge excitation voltage, the circuit produces an output
signal proportional to the change in resistance and thus
also proportional to the applied force. The strain gage
arrangement is chosen to compensate, as much as pos­
sible, for parasitic forces and moments (e.g. lateral
forces and torques), as well as the effects of tempera­
ture.
5.2

Strain gage covering agent

To protect the SG, the force transducers have thin cov­
ers that are welded at the base. Both variants offer good
protection against environmental influences in general. In
order to retain the protective effect, these plates must not
be removed or damaged in any way.
A0674-5.0 HBM: public
Structure and mode of operation
13