Cooper-instruments-systems Dytran 5340 USB Triaxial Accelerometer Manuel d'utilisateur télécharger pdf (Page 11)

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REVB10/18/12,ECN8972

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11

11. DataIntegrityIndicator

TheDataIntegrityboxindicatesoneofthreeconditions:OK,Overflow,orChecksumFailure.

An overflow condition occurs when system resources are inadequate to sustain data

processing at the selected bandwidth.This might be due to CPU speed, insufficient free

memory or cpu/memory‐intensive processes running concurrently with the VibraScout™

application.Anoverflowindicatesalossofsomedatasamples.Theconditioncanusuallybe

eliminated by selecting a lower bandwidth.A Checksum Failure indicates a fault in USB

communication.Ifthisoccurs,checkthecableconnectionbetweenthe7543AandthePC.

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12. ClearButton

TheClearbuttonclearstheplotsandthemin,max,meanvalues.Plotsareautomatically

clearedatthestartofeveryacquisition.

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13. PlotVerticalAxisScaling

Range and Offset values for each axis can be specified or Auto‐scaling can be selected to

adjustthescalewhenanaccelerationvalueexceedsthecurrentrange.

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14. AbsoluteandRelativeMode

InAbsolutemode(Abs),accelerationdataareshownrelativetotheearth'sgravitationalfield

usingthefactorycalibration.InRelativemode(Rel),theaccelerationoffsetsaresubtracted

fromthedatausinguserselectedOffsetvaluesacquiredintheConfigurationscreen.See#6

OffsetsintheConfigurationsection.

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15. LogtoFile

DataFileloggingisenabled/disabledbythecheckbox.Thenameofthedatafileandrelated

parametersarefirst specified intheConfiguration screen.If no datafile isspecified in the

Configurationscreenandthischeckbuttonisselected,adatafilepromptmenuwillpopup

requestinganewdatafiletobecreated.

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16. FFT

The frequency spectrums of the three acceleration axes are calculated and displayed by

clickingtheFFTbutton.TheFFTisperformedonallplotdata.FFTplotscanbedisplayedin

Linear or Log format and the displayed frequency range is selectable.The maximum

selectablefrequencyisequalto1/2thesamplerate.

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Cooper-instruments-systems Dytran 5340 USB Triaxial Accelerometer Manuel d'utilisateur Page 11