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5
Structure and mode of operation
5.1
Force transducer operation
The measuring element is a steel loaded member to which strain gages (SGs)
are applied. The SG installations consist of four full bridge circuits offset by 90°
and pasted onto the loaded member. The SGs for each measuring circuit are
installed so that two are stretched and two are compressed when a force acts
on the transducer. Each strain gage changes its ohmic resistance in proportion
to its change in length and so misaligns the Wheatstone bridge. If bridge exci
tation voltage is present, the circuit produces an output signal proportional to
the change in resistance and thus also proportional to the applied force.
The alignment of the individual measuring bridges is indicated externally by
marks and numbers on the strain cylinder itself. The matching connector plug
has the same number.
The arrangement of the SGs meets the requirements of EN12390. The KDB
strain cylinder can be used to check centric force application, the free move
ment of the upper pressure plates and blocking of the pressure plates' ball
bearings.
The four measuring bridges can be connected in parallel. Then the KDB can be
used as a reference sensor which meets the requirements of at least class 0.5
per ISO376.
KDB
A04785_01_YCI_02 HBM: public
Structure and mode of operation
11
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