User's Manual

Pinpointing
106
Up to 10 measurement results can be displayed side by side. If more than 10
measurements are performed, always the oldest result (displayed on the very left) is
dropped out of the row in favor of the new result.
Ideally, the minimum value increases with every measurement as long as you move
toward the leak. The minimum value decreases again after you have passed the leak
position.
The drop symbol identifies the measurement with the highest minimum value.
This means that the leak noise at this measuring point is the loudest.
Example:
After the first pinpointing run is performed, you know the approximate location of the
leak. Furthermore you have an idea of the frequency spectrum and you are able to
assess whether the microphone gain needs to be changed or not.
Adjust the microphone gain
If the height of the level bars on the screen does only change very little from
measurement to measurement, you should increase the microphone gain (moving slide
control in the top left of the screen to the right).
If the height of the level bars does change much too much, you should reduce the
microphone gain (moving slide control in the top left of the screen to the left).
Adjust the Frequency filter
If the frequency values of the individual measurements share a common range, you can
change the frequency filter from the Broad band setting to this frequency range (see
step 6).
Perform further pinpointing runs
After the filter settings and microphone gain have been adjusted where necessary,
perform one more pinpointing run along the pipe in the area of the pre-located leak. This
time, choose a shorter distance between the measuring points.
Perform more pinpointing runs with increasingly smaller distances between the
measuring points.
The leak is considered reliably localized if multiple pinpointing runs show the leak at the
same position.
View
After the first
pinpointing run