BRUEL & KJAER 2203 User Manual

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 1 61 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,
1 6 2 1 or 1 6 2 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.

BRUEL & KJAER 2203 Specifications

General

Brand	BRUEL & KJAER
Model	2203
Category	Measuring Instruments
Language	English