Information About The Charge Amplifier And Electrical Connection - HBM PACEline CMD600 Manuel D'emploi

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We recommend that the force washer is pre-stressed to at least 10% of its
nominal (rated) force. The force washer itself can be used to determine the
initial stress.
A part of the measuring force is now shunted through the pre-stressing
element. Pre-stress and force shunt are determined by the installation
situation.
It is therefore necessary to calibrate the force washers after mounting is
complete, i.e. to compare the output signal of the sensor with a known force.
The accuracy of the measurement results depends here mainly on the
accuracy of the calibration.
11.3 Information about the charge amplifier and
electrical connection
The charge output by a piezoelectric sensor is converted into a directly
proportional voltage.
Piezoelectric sensors are ideally suited for dynamic, i.e. non-zero
point-related measurements. The drift generated by piezoelectric
measurement chains is so low that it does not affect accuracy even with high
requirements.
The drift is an effect of the charge amplifier. The transducers themselves do
not display drift if mounting and connection are implemented correctly. The
maximum drift of a measurement chain is 0.1 pC/s or 25 mN/s if quartz is
used as sensor material and 13 mN/s for the sensor material gallium
phosphate.
CMD600
A2781−2.1 en/de/fr