16
5 Measuring the sound velocity
Create an artificial leak to generate a noise source (e.g., opened
z
hydrant) or take a hammer and beat rapidly on the fitting.
Select Start with the Arrow keys.
z
The measurement procedure begins.
After the
z
measurement the correlation function is displayed
on screen.
The cursor is automatically set to the position with the largest
z
value. Check whether this position corresponds to your artificial
leak. If require, move the cursor with the arrow keys or Rotary
regulator to the artificial leak.
If you select Input in the menu:
z
The determined sound velocity is loaded into the internal
–
memory.
The measurement method „Measure sound velocity“ is exited
–
(reset to „standard“ method).
The central screen is called up.
–
You can now perform a correlation measurement for determin-
ing the real leak. When entering
pipe data which may require
modifying, it is recommended that you also enter the determined
sound velocity. Select the item „Direct“ under ”Pipe material”
for this.
If you select ”Cancel” in the
z
menu:
the determined
–
sound velocity will not be accepted.
the
–
measurement method “Measure sound velocity” is exited
(reset to “Standard” method).
The central screen is called up.
–
