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).
Power and Water Authority
Report ; 39/1992
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Technical Report WRD92039 Viewed at 15:07:17 on 29/07/2010 Page 156 of 192. spreadsheet also calculates the mean and standard deviation of the errors bot.h inside and outside the transducer operating range (after r.mning the macro called "error"). Some examples and printouts from the worksheet are contained in the "Probe check spreadsheet" folder. Check SOmE! of the "error" calculations, and vie'll a graph of error .v. depth. Print the sheet or ~lrite the basic accuracy results on a sheet to be kept with the manually collected test data Record the accuracy parameters on the system history sheet. The recalibration parameters "s" and "0" must be calculated separately. Perform a regression analysis, the column of the l.feans of readings at each depth using as the "x-range" and the correspcnding column of "Actual Depths" as the "Y-range". Symphony provides the slope (s) as the "X-coefficent" and the offset (0) as the "Constant". Note that this method allows only one logged reading for each probe placement to be used for the accuracy and recalibration calculations, as opposed to Hethod I, 'llhich includes the logged data for the times of each manual reading included. C2.3.2 Over-range Accuracy: ( i ) Over-- range; In general the probes will be operational, but less accurate, to some degree beyond their specified ranges. Examine t.he stage II data through , and note at what depth (and by how much) the logged readings begin to deviate by over (the greater of) lOOmm or 0.5 %FS from the manual readings. Inc;cude this depth and the system error at the maximum depth '.lsed in the test in the system history file.
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