LOKAL 400 Operating Manual
Page 24
The frequency value of the high-pass filter can be changed by turning the dial or by drawing the high-
pass filter with a finger on the touch screen to the requested position.
The frequency value of the low-pass filter can be changed by pressing the dial once. The low-pass filter
setting menu is activated now. This is indicated with low-pass filter value list (3) A highlighted in red and
the red low-pass filter bar (3) B in the frequency range.
TIP:
Low-pass filter setting is optimal in the field when all high-frequency parts are still within the selection.
Optimal high-pass filter setting, however, is indicated by the lower left area of the selection range being
positioned on the sloping right flank of the biggest spectrum portion.
If yo
u wish to leave the window, please press the “Cancel“ key or tap on the lower frequency chart (1).
NOTE:
Changing the filter setting will result in the current measurement series to be deleted !
Automatic:
The Lokal 400 system is capable of optimizing the filter settings automatically. In order to do so, please
open the window for the frequency range indication and keep this
button pressed for a little while.
As soon as the operator hears several beeps while the button is pressed, the button can be released and the
system will choose the most suitable filter setting for the acquired noise automatically.
The Lokal 400 device features a function to activate the headphones during the filter setting process.
This function can be activated/de-activated by pressing the
key briefly while running the filter setting
process. The status symbol for the additional acoustic feature as shown in window (4) indicates the
current status of the function.
If the function has been activated, the current noise is also transmitted during the filter adjustment process.
This allows limiting the frequency ranges you wish to apply not only numerically but also as per your
hearing requirements.
8.5. Saving and uploading measurement series
All measurements and measurement series conducted with the Lokal 400 system can be transferred
durably to the measurement value memory of the device for subsequent processing or comparison. The
“Saving and Uploading” menu item can be selected directly in the window for acoustic pipe rupture
detection.
Saving measurement data
If you wish to file measurements or measurement series in the memory, please navigate with the dial to
the “Saving“ menu item
(symbol as shown above) and then press the dial to confirm your selection. As
an alternative,
you can also reach the “Saving“ menu item via the touch screen. The display now changes
to the memory window where the measurement data is saved.
Select an appropriate memory cell and confirm your selection with the dial or by tapping on the
“Script” icon.
The measurement series has now been filed.
Uploading measurement data
If you wish to upload saved measurements or measurement series in the measurement value memory,
please navigate with the dial to the “Saving“ menu item
(symbol as shown above) and then press the dial
