8
Logging Software – BZ 7224
Fig. 8
Logged values,
displayed as a profile.
Note that a text
annotation (left) and a
voice annotation (right)
are attached
With the optional Logging Software enabled, Type 2250 be-
comes a versatile instrument for obtaining time histories. The
Logging Software allows you to select freely among the
broadband parameters and log them at intervals from 1 s to
24 h. At the same time L
Aeq
and/or L
AF
can be logged at
100 ms intervals.
If Frequency Analysis Software BZ 7223 is enabled, the Log-
ging Software additionally lets you log spectra at the same
1 s to 24 h periods.
Logging Software BZ 7224 incorporates a number of features
designed to make difficult field work as manageable as pos-
sible.
Among the most salient of these features are the following:
• Five user-definable markers can be set on-the-fly in the profile. Use these, for example, to
clearly indicate specific noise sources
• Markers can be set directly on the profile display using the stylus and the touch screen.
Simply ‘tap and drag’ on the part of the profile you want to mark and select a marker from
the drop-down list
• Markers can even be set ‘after the fact’. The display covers the latest 100 samples (that is,
100 s of profile when logging at 1 s intervals, otherwise more) meaning that in most cases
you can wait for the event (or disturbance) to stop before placing your marker. Alternatively,
scroll back in the profile and set your marker
• The profile display can be ‘frozen’ at any time (this happens automatically when you tap
the screen), allowing you to work at ease
• Voice annotations, using the commentary microphone, are attached to the exact point on
the profile where the annotation is made. With the microphone on an extension cable,
comments can be associated with particular parts of the profile without interfering with the
measurement
Fig. 9
Display showing part of
a profile with 100 ms
resolution
All markers and annotations are saved with the measurement,
see Fig. 8 and Fig. 9. No further bookkeeping is required.
When exporting data to, for example, 7820 Evaluator soft-
ware for further analyses, markers, as well annotations, are
directly accessible on the profile.
Data are stored directly on SD or CF cards. BZ 7224 includes
a suitable SD card. Data can be directly read from the SD
card by the included PC software BZ 5503 (see page 11).
This means that even large amounts of data can be quickly
transferred to a PC.
In order to give an indication of the amount of memory
required, some examples have been listed in the following
section. Values should be compared to the standard size of
the SD cards used, which start at 128 Mbyte.
For convenience, values for 1 s logging periods during 24 h are given. Other values easily
compute from these:
• Five broadband parameters, no statistics: 1 Mbyte
• All broadband parameters, one 100 ms parameter: 3 Mbyte
• All broadband parameters, no statistics: 4 Mbyte
(40 Seiten)
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