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Electronic Data Collection and Analysis System



Electronic Data Collection and Analysis System


Yin Foo, Des; Foley, Margaret


E-Publications; PublicationNT; E-Books; Report ; 39/1992




Made available via the Publications (Legal Deposit) Act 2004 (NT).





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Power and Water Authority

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Report ; 39/1992

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Technical Report WRD92039 Viewed at 15:07:17 on 29/07/2010 Page 26 of 192. determined by un error analysis of the test results. See also comments in section 'DATMAN', a custom data manipulation package (see section 5.2), can be used to calculate the calibration adjustments and the logged data can be linearly recalibrated to the "True" readings by applying the new slope (s) and offset Co) where : , Recalibrated data = s x Logged data + 0 Once "s" and "0" are known, the corrected logger calibration parameters can be calculated (refer Appendix D), and in both the Wesdata and Torrens systems, entered directly to the logger. The Mindata system does not allow calibration data to be entered, so a record of the calibration correction for {lach individual system must be kept, and applied at the data editing stage. static water Level Test 'Ihe data collected from these tests are filed in working data files and diskettes (Reference 18). Typical test results are available on the "Symphony" spreadsheet files. It must be noted that the "errors" in logged data heree.fter referred to are differences compared to manual readings (ie. gi ven time). "error" = logged reading - manual reading for System inaccuracy is described in terms of the difference of logged data compared to the true depth. It can be expressed as either a "total" inaccuracy (due to all causes) or Gan be separated into components including non-repeatabilitYt non-linearity and temperature It is also usually separated into transducer and hyste,risis, instelbili ty. logger components. Manufacturers usually specify transducer error as a "percentage of Full Scale" (%FS). That is t a percentage of the transducer's specified operating range (e.g. a 20mm error from .:! 10m transducer would be expressed as 0.2 %FS).