Operating instructions HLE 500/5000
18
MAN_HLE500_HLE5000_eng_02
The histogram measurement as shown in fig. 16 shows very
different current values. On the other hand the 5th DSA
shows a clear maximum for the minimum values. The burst
pipe is thus in the vicinity of the 5th measurement location.
Additionally a small graphical symbol indicates the maximum
measurement for easy recognition. To leave the histogram
measurement, press the “ESC” soft key.
3.9
Long-term measurement
(HLE 5000 only)
This function is intended to record sounds over a
programmable period and then display as a graph. With this
method the identity of a water pipe can be established by
recording the flow noise of a valve. To do that, the
microphone is put onto the pipe and the long-term
measurement is started. Then, you close the valve for a
certain time (at least 2 minutes) and then open it again. If the
pipe at the listening location is identical to the shut-off pipe,
then this should be visible on the sound level curve. In fig. 17
a sound level curve like this is shown.
Fig 17 :
Long-term measurement
To set this function, from fig. 1 the
soft key is pushed.
The menu for the long-term measurement will appear as in
fig. 17. To specify the duration press the
soft key (time)
repeatedly until the required measurement time is set, as
shown top right in the display. Recording durations of 3 - 10 -
30 minutes are available. After setting the duration, push the
(start) soft key. The measurement will start and could be
stopped early by pressing the
(stop) soft key.
