BRUEL & KJAER 2203 User manual

Instruction Manual
Precision Sound Level Meter Type 2203
2203
This portable sound level meter complies
with all existing standards for precision
sound level meters. It is equipped with an
individually calibrated condenser micro-
phone, an internal reference voltage for cali-
bration, "Lin", "A", "8", and "C" weight-
ing networks, "Fast" and "Slow" meter re-
sponses, and an AC
output for connection
to recorders, etc.. External filters can be di-
rectly attached, !3nd a wide range of acces-
sories is available. It can also be used with
an accelerometer for vibration measure -
ments .
+ Bri.iel &Kjmr

PRECISION SOUND LEVEL METER
TYPE 2203
Applicable to instruments from serial no. 598 006
Reprint April 1 977

CONTENTS
1. INTRODUCTION AND SPECIFICATIONS (PRODUCT DATA) ................................................. 1
2.
CONTROLS .. .. .. .. .... .... .. .. .. .. . .... . .. ..... .. . .. . .. . .. .......... .. .. .. ........ .. .. .. .... .. .. .. .... .. .. .. .. .. .... .... .. ...... .. .. 9
3. OPERATION ......................................................................................................................... 13
3.1. BATTERY CONSIDERATIONS .. .. ..... . .......................................................... 13
3.2. GENERAL CONSIDERATIONS .. . .............. . ................................................. 14
3.3. CALIBRATION FOR SOUND MEASUREMENTS ....... .......... . .................. ........ 14
General ....................... . .......................................................................... 14
Acoustical Calibration (External Source) ..................................................... 14
Calibration using the Internal Reference Voltage ......................................... 15
3.4. SOUND MEASUREMENTS ....... ........ ........... ................ . ........... .. ................ 17
General ............................... . ..... . ....... ...... ............... . ............ . .................. 17
Procedure for Sound Measurements ....... .. ............ .. ........... .. .... .. .. .. .. .. .. .. .. .. 17
3.5. CALIBRATION FOR VIBRATION MEASUREMENTS ..... ................ ...... ........... 18
General ............ .. ............ .. ......... . .. . ......................................................... 18
Calibration using the Accelerometer Calibrator Type 4291 ........................... 19
Calibration using the Internal Reference Voltage ......................................... 20
3.6. VIBRATION MEASUREMENTS ................................. . ................... . ............ 20
General ...... ..................................... .. .. . ........... .. ..... .. .................. ............ 20
Procedure for Vibration Measurements ...................................................... 20
3.7 . CALCULATION OF VIBRATION AMPLITUDE ..... . ........ . ..................... . ............ 21
With 4291 Calibration, Without Integrator ................................................. 21
With 4291 Calibration, With lntegratorZR 0020 .. ............ .. ............... .. ....... 21
With Internal Calibration, Without Integrator ...... ......... .... .. ......................... 23
With Internal Calibration, With Integrator ZR 0020 .. ...... .. . .. .......... ........... . .. 23

FEATURES:
• Complies with all existing
standards for precision
sound level meters
• Equipped with individually
calibrated, high sensitivity,
precision condenser
microphone
• Conical shaped front-end
for minimum disturbance
of sound field
• RMS detector with crest
factor capability up to 5
• "A", "8", "C" and "Lin"
frequency weighting
• Performs as Octave or
Third-Octave analyzer with
system-matching filter sets
• AC output for recorders
etc.
• Performs as Vibration
Meter or Analyzer
combined with appropriate
accessories
• Wide selection of
accessories
16- 169
type 2203
Precision Sound Level Meter
USES:
• Acoustics, measurement
of sound insulation, sound
distribution etc.
• Noise and vibration
measurements in industry
for quality inspection and
development
• Noise and vibration
measurements for health
protection
• Audiometer calibration
The Precision Sound Level Meter
Type 2203 has been designed as a
robust compact unit able to perform
sound and vibration measurements
of almost any kind with the highest
degree of accuracy . The instrument
fulfils the requirements of IEC 1 79,
DIN 45 633 part 1 as well as ANSI
S1.4- 1 971 Type 1 for precision
sound level meters and includes the
A, B and C weighting networks and
the Fast and Slow meter responses .
In- and output sockets, for connec-
tion of external filters for frequency
analysis of the measured signal, as

well as a recorder output, for con -
nection of headphones, level record-
ers etc. are also provided . A built-
in reference voltage provides easy
electrical calibration of the instru-
ment. The sound level meter is pow-
ered from three standard 1,5 volt
batteries giving 10 hours of continu-
ous operation. Longer operating
times can be obtained using alka-
line batteries or rechargeable NiCd-
cells. The battery condition can eas-
ily be checked on the meter.
Sound Measurements
As standard , the instrument is
equipped with a B & K high sensitiv-
ity, 1/ 2" diameter, free-field Con-
denser Microphone Type 4165, giv-
ing it a measuring range from 26 to
140 dB(A) and a wide frequency
range, both in free and diffuse
sound fields, due to its excellent om-
nidirectivity . The microphone is de-
livered with its own individual cali-
bration chart giving all relevant cali-
bration data and complete fre-
quency response curve.
The microphone may be mounted
directly on the instrument but
should normally be mounted on the
Extension Rod UA 0196, which is
included, and which, together with
the conical shaped front - end of the
instrument secures the omnidirE::c-
tional characteristics required to ful -
fil IEC, DIN and ANSI requirements
for precision sound level meters . If it
is desired to remove the micro-
phone even further from the instru -
ment, a 3 metre Extension Cable
AO 0128 is available. A wind-
screen is supplied with the instru-
ment and should be fitted over the
microphone when measuring out -
doors,
to reduce wind noise . Also in-
cluded is an input adaptor, to be fit -
ted
instead of the mic r ophone, al-
lowing direct electrical input , for in-
stance from an accelerometer for vi-
bration measurements, or from a
hydrophone for underwater sound
measurements.
The instrument can measure the
linear sound pressure level as well
as the standard frequency weighted
sound levels. Two meter response
times in accordance with the stan-
dard recommendation s can be
chosen.
Use with other Microphones. For
the measurement of higher levels
2
co
"0
+20
+10
c A
5l 0
c:
0
~-10
.........
v----
~
-----
~
~
-
~
::::::::-.....
QJ
a:
~ -20
·;
~ -30
- 40
-50
- 60
v /
/ v
v /
/
/
v
- 70
10 2 5
/
...........
/
2 5 2 5 2
Frequency Hz 1
682 17
Fig . 1. Frequency response curves of the A. B and C weighting networks
and frequencies than is possible
with the 1/ 2" microphone Type
41
65, or if a linear , random inci-
dence microphone response is re-
quired, other 1/ 2" microphones
from the B & K range can be
used
directly, for instance Type
4133, 4134, 4163 or 4166. For
measurement of lower levels, the
1" microphones Type 4145 or
41 61 can be used . Adaptors DB
0962 and DB 0375 are available
for fitting these Microphones di-
rectly onto the input stage or onto
the extension rod respectively. In or-
der to fulfil the standard require-
ments to omnidirectivity, the 1" mic-
rophones require the use of a Ran-
dom Incidence Corrector UA 0055
instead of the normal mi crophone
protection grid. For special applica-
tions, the sound level meter can be
used
with other microphones than
described here and the Product
Data Sheet for the B & K micro-
phone range should be consulted.
See also survey of accessories avail-
able, on page 4.
Vibration Measurements
When the microphone is replaced
by the Input Adaptor JJ 2614 (in-
cluded) and one of the B & K acceler-
ometers is connected, the instru-
ment functions as a vibration meter
indicating the acceleration level.
Connection of the Integrator ZR
0020 between the accelerometer
and Sound Level Meter permits
measurement of vibration velocity
and displacement as well as acceler-
ation . A calcu. lating disc delivered
with the Integrator makes conver-
Fig.2. The Integrator ZR 0020
Fig. 3. The sound level meter equipped with integrator and accelerometer for vibration measure -
ments and Octave Filter Set Type 1613 for frequency analysis

sion of the dB reading into vibration
units a simple matter .
Calibration
Acoustical calibration, which also
tests the microphone, can easily be
performed by either of the two cali-
brators available: Pistonphone Type
4220, which gives a SPL of 1 24 dB
with ± 0,2 dB accuracy at 250Hz,
and Sound Level Calibrator Type
4230, which gives a SPL of 94 dB
with ± 0,25 dB accuracy at 1 kHz.
When using the sound level meter
for vibration measurements, com-
plete calibration can be performed
by means of the portable Acceler-
ometer Calibrator Type 42 91,
which calibrates at 1 g peak and
79,6 Hz.
Fig.4. The Pistonphone Type 4220 and
Sound Level Calibrator Type 4230
Audiometer Calibration,
Hearing Aid Testing
When the microphone is replaced
by an Artificial Ear Type 41 52 or
41 53 with microphone 4144 or
41 34 respectively, a precise, com-
pact and fully portable audiometer
calibrator is created . If the Artificial
Mastoid Type 4930 is connected in-
stead of the microphone, measure-
ments on bone vibrators and bone
conduction hearing aids can be
made, and if the sound level meter
is used with Hearing Aid Test Box
Type
4217, a complete test facility
for hearing aids is created.
Frequency Analysis
For frequency analysis of the mea -
sured sound or vibration level, the
Octave Filter Set Type 1 61 3 or the
Third-Octave Filter Set Type 161 6
Fig . 5. The sound level meter in combination
with Hearing Aid Test Box Type 4217
Fig .6. The sound level meter used with Arti -
ficial Ear Type 4152 for testing ear-
phones and audiometers
is attached directly onto the sound
level meter, and is connected electri-
cally with a connection bar . Type
1
61 3 contains t11 octave filters
(with adjustable attenuation) with
centre frequencies from 31,5 Hz to
31,5kHz. Type 1616 contains 34
third octave filters with centre fre-
quencies from 20Hz to 40kHz. Nar-
rower band frequency analysis, as
is
often required for vibration analy -
sis, can be made using the battery
powered Tunable Band Pass Filter
Type 1 621, (or the Tracking Filter
Type 1623.)
Field Recording
When measuring in the field, the
tedious work of plotting levels with
a pencil can be completely elimi-
nated by use of the small, portable,
battery operated Level Recorder
Type 2306 . It is connected via a
cable to the output of the sound
level meter and can record either
sound levels as a function of time
or, if the sound level meter is
equipped with a filter, sound levels
as a function of frequency . For time
recordings, use can be made of very
slow recording paper speeds, so
that diagrams showing sound level
variations over longer periods of
time can be recorded on a reason-
able length of paper . Such charts
are of great help in almost any type
of noise investigation and ease the
location of noise events with re-
spect to
time as well as the possible
source . Frequency spectrograms can
be recorded
directly on frequency
calibrated paper, and can be made
semi-automatically in a few sec-
onds, using the filters Type 1616,
1621 or 162 3. The recorded spec-
trograms and time histories provide
immediate documentation of the
measurement made and can be in-
serted directly in the measurement
report. If further investigation of the
measured signal is required back in
the laboratory, the battery operated,
portable Tape Recorders Types
7003 and 7004 should be used.
Fig .7. The portable Level Recorder Type
2306
Complete Sets
The sound level meter can be or-
dered with accessories according to
requirement. However, to simplify
ordering, four sets, containing the
most commonly used accessories,
have been
assembled. There are
two sets for sound and vibration
measurements in the field, and two
sets for audiometer calibration, the
difference being the filter included
(Type 1613 or 1616) .
The sets combine complete porta-
bility with laboratory accuracy and
are delivered in the sturdy fibre-
glass carrying case KE 0055 which
has separate compartments for
each item . The contents of the sets
are
listed on page 5.

Accessories
A wide selection of accessory
equipment is available to expand
the application possibilities of the
sound level meter . A survey show-
ing how the most useful items con-
nect is given below . For more infor-
mation on the individual instru-
ments and transducers indicated,
please ask for separate data sheets.
VIBRATION MEASUREMENT
Accelerometer
Calibrator
4291
AUDIOMETER
CALIBRATION
1"
Wind Screen
.--J
UA 0207
Sound Le
vel Calibrator
E:l
4230
SOUND MEASUREMENT
1/2"
Wind Screen
•
UA 0237
Pistonphone
I I I
4220
UNDERWATER
SOUND MEASUREMENT
Plug Adaptor
JP
0028
AdaJ;1tor
~--~---- .....
Tape Recorder 7003 or 7004
-_____,
~ Typical:4338,4366,4367,
rg Accelerometers
~ 4368,4369.
JJ 2614
Adaptor
.,_ _______ 4iiiiOOI -------1
JJ 2615
Integrator
~---~------~
ZR 0020 Control Cable.
1616-AO 0123,
1621-AQ 0035
Artificial Ear Artificial Ear
Artificial
Mastoid
•J ~ ~ Jlij
r;=
4153 4152 4930
*) Microphone Extension
Cable AO 0128 must
be used
IO~:}_l ___ l
2306 Connection
~
DB 1021
It-I
Normal
0-----,
ting Grid
Protec
Ran
dom
Incidence Corrector
1" Microphone
m [)
UA
0055
Nose
Cone
<Jll---...J4161 Dehumi-
UA
0387 difier
UA 0310
No
rmal
D-----.
1/2" Micro~
IIJ
Protecting Grid 4149 4165
4163 4166 Dehumidifier
UA 0308
Nose
1/2" Microphone
Cone 1----[]
<JJ ---....J 4133
UA
0386 4134
Normal
Protecting Grid
Nose
Cone
UA
0385
Nose Cone
1/4" 1/4" - 1/2"
Microphone Adaptor
D-- - ........
4135 UA 0035
4136
1/8" 1/8" - 1/2"
Microphone Adaptor
---~---D--~
UA 0355
Hydrophone
Type 8100
Hydrophone
Type 8103
4138
UA 0036
Plug Adaptor
1/2"- 1"
Adaptor
DB 0962
1/2" Extension Cable
AO 0128 - 3 metre
Connecting
Bar JP 0400 ~
(included with 1613
and 1616)
2 Connection
Cables
A00116
Tunable ~ - - - .. ·: · ·· · -· .
.-
Filter e -- _
1621 ., ••
Cable
AO 0116
Precision
Sound Level
Meter 2203
Octave Filter
Set 1613 or
Third Octave - - --l
Filter Set . I
1616 I
Tracking
Filter
LW--=y 1623
I
I
I
I
- _ _.J
Accessories included with 2203 underlined
Fig.8. Survey of accessories available for sound and vibration measurements and audiometer calibration
4