7
Fig. 6
Example of a typical
SLM display, including
the icon for recording
annotations, visible in
the upper right hand
corner (see another
example in the right
hand display of Fig. 5)
Voice annotations are recorded using a separate commentary
microphone when the commentary pushbutton is pushed and
held. Voice annotations and notes can be attached before,
during and after the measurement. Spoken comments during
the measurement should, of course, be made during a pause
or with the microphone placed at a distance using an exten-
sion cable. These unique features allows you to document
your measurement (where, when, how, etc.,) and always have
this information attached to the measurement. Notes and
voice annotations can be reviewed on the instrument itself
or after the data has been transferred to a PC.
If Sound Recording Option BZ 7226 (see page 9) is also
enabled, you can record all or part of the measured signal.
This recording is safely stored with the measurement. Thus
it is easy to document that measured levels are indeed related to a particular noise source
under investigation.
Frequency Analysis Software – BZ 7223
Frequency Analysis Software for Type 2250
Fig. 7
Example of 1/3-octave
frequency analysis.
Note that two spectra
are displayed
simultaneously
Frequency Analysis Software BZ 7223 is an optional software
module. It allows you to make real-time measurements in
1/1- and 1/3-octave bands over a wide frequency range. This
makes it a simple matter to obtain spectra in order to, for
example, select hearing protection, qualify heat and ventila-
tion systems, and assess tonality.
The following frequency ranges are available:
• 1/1-octave spectra (centre frequencies 8 Hz to 16 kHz)
• 1/3-octave spectra (centre frequencies 6.3 Hz to 20 kHz)
In each band you have a full and unrivalled dynamic range
from the noise floor in that particular band to 140 dB. That
is, a dynamic range generally in excess of 135 dB.
Spectra can be A-, C- or Z-weighted. Five spectra are measured and stored and, in addition,
instantaneous values are available for display. Two spectra, for example, a minimum and
maximum spectrum, can be superimposed on the display. As a matter of course, all the
broadband quantities measured by Sound Level Meter Software BZ 7222 are computed in
parallel with the frequency analysis. Spectral analyses can be documented using notes and
voice annotations.
If Sound Recording Option BZ 7226 (see page 9) is also enabled, you can record all or part
of the investigated signal. This recording is safely stored with the measurement, allowing you
to produce convincing documentation that the high levels in the 4 kHz band, are in fact related
to a hiss from a particular piece of machinery.
(40 strony)
Manymanuals.com
Manymanuals.de
Manymanuals.fr
Manymanuals.it
Manymanuals.pl
Manymanuals.cz
Manymanuals.es
Manymanuals-pt.com
Komentarze do niniejszej Instrukcji