6
Fig. 5
Example displays
showing: (on the left)
the Logging Software
BZ 7224 display, with
an on-line marker
selection in the profile
display; (in the centre)
the current averaged
spectrum from the
same measurement
and; (on the right) the
broadband values from
the same
measurement. Select
freely between these
displays at any time
Sound Level Meter Software – BZ 7222
SLM Module
All Type 2250s come with the Sound Level Meter Software enabled. This makes Type 2250
into a versatile broadband sound level meter; it complies with the latest international standard
(IEC 61672–1) as well as previous international and national standards.
All quantities are measured at the same time. For example, A and C frequency weighted levels
are measured simultaneously, and at the same time F, S and I time weightings are applied in
parallel. In addition, Peak levels are measured. Full statistics are also computed on-the-fly.
Combine this with the dynamic range exceeding 120 dB and you will never miss a beat! You
get all the parameters in one attempt, under-range is non-existent and you will have difficulties
provoking an overload. The detailed list of available parameters can be found in the specifi-
cations section. You choose what you want on the display, but, at any time – during or after
the measurement – all other parameters can be inspected and reported.
The standard package allows you to document your measurements with written notes and voice
annotations. Notes are added using a virtual keyboard on the touch screen.
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.
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