BRUEL & KJAER 2221 User Manual

USES:
•
Determination of Leq for
assessment of hearing
loss risk or noise
annoyance.
• Measurement of cyclical
machine noise
• Determination of Sound
Exposure Level (SEL)
•
Measurement of Max.
noise levels
•
Spatial averaging of
machine noise
• Sound power level
measurements according
to survey method
FEATURES:
• Direct indication of Leq and
SEL
•
Fulfils proposed IEC
standard for Precision In-
tegrating Sound Level Me-
ters Type 1 P, and relevant
sections IEC 651 Type 1,
DIN-IEC 651 Klasse 1 and
ANSI S1.4.1971 Type 1
• Max. Hold "Peak"
• Max. hold "Fast" (2221) or
Max. hold "Slow" (2222)
• Easily read digital display
• Light and compact
• AC output for recording
• Delivered with
individually calibrated
Condenser Microphone
• 60 dB dynamic range
• Comprehensive display:
overload, underrange, bat-
tery state, frequency
weighting, overflow
1-044 0059-2A
BP 0059
types 2221 and 2222
Precision Integrating
Sound Level Meters
In addition to offering Type 1 mea-
surement
characteristics, these Preci-
sion Integrating Sound Level Meters
are truly portable. Just over 20 em
long, 2,4 em
thick and weighing 400 g,
they
will easily fit in your pocket.
The use of microprocessor technol-
ogy results in accurate, true measure-
ments and simplicity of use. Leq• SEL,
and "Peak" and "Fast/Slow " Max.
Hold
are indicated on a large digital
display making reading errors virtual-
ly impossible. In addition to these ba-
sic functions, the Types 2221 and 2222
have a pause function which
greatly
extends the applications of the
instruments .
The
comprehensive digital display and
the
functional simplicity permit confi-
dent and efficient use of this Sound
Level Meter.
An
AC output allows recording of the
weighted
input signal.
Introduction
Today, noise is an important con-
sideration in many areas of the envi-
ronment and noise measurements
are no longer carried out exclusively
by specialists. With this in mind,
B & K has developed the Precision
Integrating Sound Level Meters
Types 2221 and 2222. These instru-
ments have all of the features neces-
sary for a wide variety of noise mea-
surements and comply with the pro-
posed IEC recommendation for Inte-
grating Sound Level Meters Type 1 P
and
IEC 651 Type 1, DIN-IEC 651
Klasse 1 and ANSI S1.4.1971 Type 1
standards.
The Types 2221 and 2222 carry out
basically 4 measurements: Leq• SEL,
Max. Hold "Fast" (Type 2221) or
"Slow " (Type 2222), and Max. Hold
"Peak"; all in four sensitivity ranges.
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Leq Measurements
Leq is the A-weighted noise level
averaged over the measurement pe-
riod . It can be considered as the
continuous steady noise level which
would have the same total A-weight-
ed acoustic energy as the real fluctu-
ating noise over the same period of
time . The measurement of Leq is
based on the equal energy principle:
1 JT p(t) 2
Leq = 10 Log10 - (- -) dt
T o Po
where Po is the reference sound
pressure (20 ~LPa), p(t) is the A-
weighted time varying sound pres-
sure and T is the time interval over
which it is measured.
SEL Measurements
Sound Exposure Level (SEL) is the

BRUEL & KJAER 2221 Specifications

General

Brand	BRUEL & KJAER
Model	2221
Category	Measuring Instruments
Language	English