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The settings screen in the SPL module allows you to set the measurement time. Once
you press start, the measurement will run for as many seconds as you choose here. You may also
choose to let measurements run continuously; you then determine the measurement time
manually, by choosing the moment you press "stop."
The SPL meter module also features are measurement browser, that lets you review previously
saved sound pressure level measurements.
A few things to note about SPL measurements and the SPL meter module:
•
By definition, "max hold", "EQ" and "PK" are mutually exclusive settings.
•
The elapsed measurement time is shown above the progress bar. If the
measurement interval is set to "continuous," the measurement will run un-
til it is manually stopped. Note that, in practice, the maximum measuring
time is limited by:
•
The battery. When measuring continuously, the battery is drained
relatively quickly (within 3-4). For longer measurements, we rec-
ommend using the charger or an external power bank.
•
Internal data storage, especially if you are recording all measure-
ment audio (per the option in the "Settings" module). When re-
cording audio, the internal storage fills up in about 5 hours.
•
When you press "save," data from the current measurement is stored. Re-
sults based on all time and frequency weightings are saved; not just the
results that are currently displayed. However, as remarked above, since the
instantaneous levels fluctuate throughout the measurement, these cannot
be saved as a single number representing the entire measurement interval.
So for each saved measurement, just the maximum level (max hold) and
equivalent continuous level (EQ) and Peak level (PK) are saved.
•
As a logical consequence, the measurement browser can only display Max
Hold, EQ and PK results from earlier measurements. If you set a display
field to show instantaneous values, the measurement browser will leave this
display field blank.
•
You can use the measurement browser to go back to earlier measurements,
and see what the level is with different time- and frequency weightings
applied.
•
The measurement numbers form a separate consecutive series for each
module. That means that the same measurement number might occur
multiple times (once for each module; e.g. number #0002 might exist for
SPL as well as RTA, STIPA, etc.)
VOX-01 Operating Manual
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