Norsonic nor140, Instructional Manual, Page: 59 / 220

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Norsonic Nor140
Instruction Manual
The time profile display
Pause and profile
Here, the instrument is in
pause
mode. Global acqui-
sition is halted, but the profile is still acquiring data.
The thin line below the graph represents a marker
associated with the periods acquired while paused.
The meaning of the line below the graph is given by
the text: Mk: P which should be interpreted as Marker:
Paused to indicate that these data will not be a part
of the global level assessment.
The measurement duration setup menu
The profile resolution does not have to be selected
so that the global duration becomes a multiple of the
profile resolution. The last period will be truncated if
the duration divided by the profile is not an integer.
Total (global) duration
of measurement.
Selected resolution
No. of periods with
selected duration and
resolution
Max. No. of periods
(depends on the
amount of free memory
available)
The Δ
indicates
profile (global is
indicated by a
Σ
)
Graph cursor.
Use keys to
move the cursor
along the graph.
This feature is
not available
during a meas-
urement
Display top scale
Spectral weight-
ing function
applied to the
right hand
bargraph,
Measurement
running
Value at cursor’s
position
Which resolution should you use?
This will always be a trade-off between the
need for information and the amount of data
generated. You should also take into consideration
the global duration of your measurement.
For example, you may want a higher resolution
in a 1 minute measurement than in a 24 hour meas-
urement. Will you need a 1 second resolution for
24 hours? It’s going to be a lot of information to go
through afterwards.
No absolute rules or guidelines can be given
since there are so many different applications and
requirements.