LOKAL 400 Operating Manual
Page 14
Tapping on the level makes another window open where you can adapt amplification to a level between
0 and 100%. Pressing the dial or tapping on the device outside the window will close this sub-menu, and
the set amplification level will be displayed below the noise level. The appropriate amplification level has
been selected if the medium noise level fills about the half of the noise level indicator. The noise can be
listened to with the headphones and thus can be checked if the signal intensity is too low or if the signal
is overdriven.
When all input has been entered, the correlation can be started by tapping on the
“Play” button [1]
. The number of average determinations is counted up, and the correlation peak should start
forming. The measurement process can be interrupted anytime by tapping on the
“Stop” icon
located in the upper right corner. The measurement procedure will run up to 250 average determinations
in the manual mode unless the measurement is interrupted beforehand. Usually 40 to 50 average
determinations are sufficient to receive a proper result. If the result is not satisfactory, you may have to
check and to adjust the filter settings, amplification, or the measurement set-up.
7.3. Setting options for correlation (correlation main window)
The correlation main window offers the following operating elements:
[1] Start/Stop of a measurement
[2] Switching between different signal entries
[3] Headphone jack for different signal entries
[4] Headphone volume
[5] Saving the measurement
[6] Indication of pipeline rupture symbolically and numerically & active button for material input
[7] Correlation results
[8] Amplification Channel A [8.1] numerical value (0-100%) to amplify Channel A
[9] Frequency illustration (FFT) for Channel A
[10] Coherence (FFT) for A and B
[11] Frequency illustration (FFT) for Channel B
[12] Amplification Channel B [12.1] numerical value (0-100%) to amplify Channel B
[13] Number of completed average determinations
[14] DELTA T in milliseconds
