19
Fig 16: Memory measurement
Changes in the minimum leak value (wide column) are
particularly significant; as the operator gets closer to the leak,
the minimum leak sound level increases with each new
measurement. Conversely, it will decrease as the operator
moves further away from the leak. Figure 16 shows a series
of memory measurements first moving close to the leak, and then
away from the leak sound. The HL 5000 places a small symbol to
the right of the memory measurement with the highest
minimum leak sound, helping the operator identify the area
closest to the leak. To exit the memory mode, press the
ESC soft key.
3.9
Continuous Measurement (HL5000 Professional)
Continuous Measurement mode allows the operator to set
the microphone in position and monitor sound levels at that
location over short periods of time. Operators often use this
feature to see what happens to a leak sound when a nearby
valve is closed and re-opened.
To enter continuous measurement mode, press the soft key
below the continuous measurement symbol
on the Main
Screen.
The HL 5000
can continuously measure leak sound for 3, 10, or
30-minute intervals. When in continuous measurement mode,
repeatedly press the soft key until the desired length of
measurement period has been selected (Fig. 17).
Pressing the (start) soft key will begin the measurement, during
which time the results will be displayed by a graph on the screen.
