Product data

2
The Hand-held Analyzers
Fig. 1
Hand-held Analyzers
Type 2250 and 2270
Types 2250 and 2270 are robust, hand-held anayzer
platforms designed to host a wide range of sound and
vibration measurement applications. Their uses range
from assessing environmental and workplace noise to
industrial quality control and product development (Product
Data BP 2025).
Easy to use – their light and ergonomic design make
them easy to grip, hold and operate single-handedly. Their
high-resolution colour touch screens show the analzyer
setup, status and data at a glance, and with a tap of the
stylus, you can make quick selections. The “traffic light”
indicator, positioned centrally on the pushbutton panel,
shows you the current measurement status, even from a
distance.
Robust – the hand-held analyzers are built for the tough environment of field measurements. They will work
reliably in rain, dust, heat, frost, and during day or night.
To document your measurement, you can add spoken or written comments and make signal recordings
during any measurement. (Note that signal recordings require the Signal Recording Option BZ-7226.)
Type 2250 is a single-channel analyzer, while Type 2270 is 2-channel and has additional features such as a
built-in camera (allowing you to attach photos to your measurements).
Tasks in Building Acoustics
Fig. 2
Typical configuration
for building acoustics
measurements: sound
source, generator,
analyzer and PC for
reporting
Fig.2 shows a typical
configuration for the most
common task in building
acoustics measurements:
airborne sound insulation.
Fig.3 shows a typical airborne task setup using a loudspeaker (emitting pink noise) and a number of
microphone positions to measure the average source room spectrum L1, and the average receiving room
spectrum L2. The average background noise spectrum B2 is also measured to verify the true L2 spectrum.
Fig. 3
Sound source and
microphone positions
for measuring airborne
sound insulation
L1 = Source room level
L2 = Receiving room
level
B2 = Background level
T2 = Reverberation
Time
The average reverberation
time spectrum, T2, is
measured to correct for
the amount of absorption
in the receiving room.
Finally, the single number
result (for example: D
nTw
)
is calculated from the L1,
L2, B2 and T2 spectra,
and the result can then
be compared with the
minimum requirements
stated in the building
regulations.
2734-A Power Amplifier
4292-L OmniPower
2250/2270
Hand-held
Analyzer
8780 or 7830
Building Acoustics Software
090062/3
PC
Report
with BZ-7228
Building Acoustics
Software
Source Pos 1
Source Pos 2 Volume V
Mic Pos 1
Mic Pos n
Mic Pos n
B2
L1
L2
T2
Mic Pos 1
070141
Area
S
Source Room Partition Receiving Room