Larson Davis SoundExpert LxT, Руководство пользователя

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LxT Manual View Spectrum Normalized (Optional)
5-21
A time-stamped record is made for every Run, Pause, Stop,
Voice Message or Marker action. The source responsible for
each action is also recorded, which may be any of the
following:
• Key press
• USB command
• Run timer compete
• Low battery
• Out of memory
• Preamplifier disconnect
The icons in the left column of the display indicate the
action: Run, Pause, Voice Recording, etc. The date and time
of the action is displayed next to the icon.
Each measurement segment (from Run to Stop) is
numbered, as is each voice message.
Navigate through the list and expand each item. The number
in the upper right corner of the expanded item indicates
which item is being viewed out of how many total items are
in the list.
View Spectrum Normalized (Optional)
The Live Spectrum continues to
change in time following the
normalization, whereas the
Reference spectrum remains the
same. The View Normalized function permits the display of the
difference between two spectra by subtracting a user-
selected reference spectrum from the measured spectrum.
This function can be used with both 1/1 and 1/3 octave
spectra, although the measured spectrum and the reference
spectrum must have the same bandwidth: 1/1 or 1/3 octave.
View Spectrum Normalization is context sensitive and
displays the normalized spectrum for the data from the tab
where it was activated, whether
Live , Overall ,
Measurement History, or others.
A and C frequency weighting curves can also be used for
references, as described in "Normalizing using Frequency
Weighting” on page 5-24.