PCB Test & Measurement Seite 167

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For Additional Specification Information Visit www pcb com PCB PIEZOTRONICS INC 716 684 0001 Fax 716 685 3886 165 Technical Information Load Cell Determine the capacity required A What is the maximum expected load B What is the minimum expected load C What is the typical expected load D What are the dynamics of the system i e frequency response E What are the maximum extraneous loads to which the load cell will be subjected How will the load cell be integrated into the system A What are the physical constraints e g height diameter thread B Will the load cell be in the primary load path or will the load cell see forces indirectly What type of environment will the load cell be operating in A Maximum temperature B Minimum temperature C Humidity D Contaminants e g water oil dirt dust What accuracy is required A Non linearity B Hysteresis C Repeatability D Cross talk Application Questionnaire temperature remains stable during the test the temperature related errors can be ignored If the sensor is used for increasing load measurement only ignore the hysteresis error If the load measurement is near the full capacity the linearity error can be ignored If the capability exists to correct the data through linearization fit or a look up table the error in the measurement can be minimized A sophisticated user can get rid of all the errors except for the non repeatability error in the measurement Often overlooked by the customer is the error due to the presence of non measured forces and bending moments Even though the single axis of measurement sensors are designed and built to withstand these non measured forces and bending moments extraneous loads the errors due to them are present PCB Load Torque engineers can design the set up to eliminate or minimize these extraneous loads However if these extraneous loads are present the errors due to them should be considered Due to cost restraints PCB Load Torque as with its competition does not typically measure or compensate for errors due to extraneous loads If the presences of these extraneous loads are known the user should request the transducer manufacturer to run a special test at extra cost to define and quantify the extraneous load errors These errors are defined as cross talk errors Typical Application Examples Hydraulic Actuators Life Cycle Testing Quality Control Material Fatigue Testing Torque Arm Tank Weighing For Further Information Refer to www pcbloadtorque com 9 T Mcatalog 2011 Seite 125 166 SYN G500 21 04 11 18 04 Seite 171


Vorschau PCB Test & Measurement Seite 167