![]() In order to keep the piezoelectric measurement chain drift low, all plugs and sockets must be kept clean at all times. ![]() Insulation resistanceof the cable between transducer and charge amplifier is too low, the measurement chain will drift as charge will discharge via the too low insulation resistance. Running-in behavior of the charge amplifierThe charge amplifier should run in at least a hour before measurements start. In order to achieve a lower drift, please note the following two points:ġ. 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. The transducers themselves do not display drift if mounting and connection are implemented correctly. The drift generated by piezoelectric measurement chains is so low that it does not affect accuracy even with high requirements.Ĭharge amplifier. Piezoelectric sensors are ideally suited for dynamic, i.e. The accuracy of the measurement results depends here mainly on the accuracy of the calibration.Ĭharge outputby a piezoelectric transducer is converted into a directly proportional voltage by means of a charge amplifier. to compare the output signal of the transducer with a known force. It is therefore necessary to calibrate the force washers after mounting is complete, i.e. Pre-stress and force shunt are determined by the installation situation. The force washer itself can be used to determine the initial stress.Ī part of the measuring force is now shunted through the pre-stressing element. We recommend that the force washer is pre-stressed to at least 10% of its nominal (rated) force. This pre-stressing means that another mechanical element is mounted parallel to the force transducer. The pre-stressing of the force washer is necessary to ensure the linearity and structural durability of the transducer. These transducers must be calibrated when in a mounting condition. Is an initial stress required?The CFW force washers are significantly flatter in design and are not pre-stressed. TheĪccuracy of the measurement results depends here mainly on the accuracy of the calibration.ġ. Shunted through the pre-stressing element. ![]() The force washer itself can be used to determine the initial stress. Pre-stressed to at least 10% of its nominal (rated) force. Pre-stressingmeans that another mechanical element is mounted parallel to the force transducer. Pre-stressing of the force washeris necessary to ensure the linearity and structural durability of the transducer. Modern Slavery & Human Trafficking StatementĬFW force washersare significantly flatter in design and are not pre-stressed.Financial Integrity & Protecting our Assets.Fatigue and Durability Analysis Training.Vibration Transducer Calibration System.Accessories for Vibration Testing Equipment.
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