User's Manual
61
3.Enterpipedata
For calculating cross correlations, pipe data has to be entered by selecting the menu item Measurement‐
Enterpipedata...orpressingthebutton
Up to 4 different pipe sections may be entered by selecting pipe section length, material, diameter and
soundvelocity.Ifmaterialordiameterisnotinthelistorexactsoundvelocityisknown,soundvelocitycan
beentered manually byselectingmaterial Other.Entered pipedatawill be automatically storedin internal
datab
ase.
Autocorrelationmaybedonewithoutenteringpipedata.
16.1 Resultdisplay
After entering pipe data, the correlation results will be displayed below the correlation graphics(or values
table, if tabular view is selected). The result display shows the distances between the two loggers and a
possible leak. On the left side there's a small bar graphics (Q) indicating the calculated quality of the
correlation (0 to 5 bars). The higher the va
lue the better the correlation quality and the higher the leak
probability.
16.2 Filter
Quality of correlation results may be improved by using the filter function. Filter frequencies will be
preselectedafterenteringthepipedataandmaybeadaptedmanuallybytheuser.
Testcorrelation
Function for a quick check whether the selected combination of loggers produces a reasonable correlation
(i.e.probableleak)ornot.Pipedataneedn'tbeentered(thecorrelationwillbecalculatedonbaseofapipe
lengthof600mandasoundvelocityof1000m/s).Correlationqualitywillbecalculat
edandwillallowquick
assessmentwhetheraleakisprobable.
Note: This function is not suitable to obtain leak distances. For calculating a correct correlation result
(distancetoleak)itisnecessarytoentercorrectpipedataandtoswitchoffthetestcorrelationfunction.
Execute all test correlations (main menu it
em): Function for testing all combinations of loggers whether
thereareprobableleaksornot.Awindowwillappearcontainingthetestresults.Itispossibletoadjustthe
testpipelengthandsoundvelocity,aswellasthequalitylimitvalue.
AfterpressingtheStartbutton,correlationqualitywillbecalcula
tedforeachpossiblecombinationofloggers
(value0to100%),incasethereareappropriatesoundrecordings.Onlytestcorrelationswithaqualityvalue