Precision Int egrating Sound Level Meter — Type 2236
USES:
❍ Measuring environmental noise
❍ Measuring occupational noise
❍ Frequency analysis of sound sources
❍ Simultaneous RMS and Peak measurements with
independent frequenc y weighting
❍ Automatic logging of results
❍ Performs complete statistical ana lyses
❍ 40 records of m anually stored results
❍ Back-lit display
FEATURES:
❍ Conforms with IEC651 (1979) and 804 (1985) Type 1
❍ Conforms with ANSI S1.4 -1983 and Draft S1.43-
❍ Automatic-start allows for unattende d
measurements
❍ Optional octave filter
199X Type 1
❍ Calculates and displays L
Precision Integrating Sound Level Meter Type 2236 is a Type 1 instrument, designe d to meet string ent stand ards in environm ental- a nd occup ational- noise m easurement.
As Type 2236 is designed to fulfil the national standards and directives, all parameters can be obtained from the one measurement. This saves both time and money.
Measurements are displayed on a large (4 lines, 16 characters/line) LCD screen.
The SPL (RMS) is con tinuously monitored on a qua si-analogue display. The digital
output allows interfacing with personal computers and printers, for further data
processin g/presentat ion and p rinting.
The linearly-weighted AC output allows for a direct calibrated recording (on Digital
Audio Tape, for example), enabling later analysis.
values
N
*
* user-definable for USA, UK e and Japane se models
Description
Precision Integrating Sound Level
Meter Type 2236 has been designed
specifically for environmental- and
occu pation al-noise measur ements.
Double-detector
A unique feature of the 2236 is that
RMS and Peak detection occurs in
parallel. In this way the sound level
meter can display both the RMS value and the Peak value of the same
signal — particularly useful when
analyzing transients or impulses.
Intuitive User-interface
The clearly marked arrows and symbols on the front panel, combined
with the large LCD screen (with back
light) make the sound level meter
very easy to learn and use. The dis-
Brüel & Kjær
B
play is clear and concise, and an interactive dialog guides you through
your measurement, quickly and efficiently. Warnings are also given when
you attempt to change a set-up parameter once you have started your
measurem ent.
Statistics
The sound level meter has three use rdefinable L
ones for the International version).
With the USA and UKe models you
can also perform Level and Cumulative Distributions on the results, allowing basic statistics on the spot.
Real-time Clock
The 2236 sound level meter has a
real-time clock for marking results
with the date and time of any
measurement—particularly useful
for storing dat a for fut ure use or p res-
K
values (only two fixed
N
intervals. These band-pass filters
F
f
have centre frequencies of 31.5Hz,
63Hz, 125 Hz, 250 Hz, 500 Hz, 1kHz,
2kHz, 4kHz and 8kHz.
dB2XL Software
The dB2XL software allows you to
transfer the measurement results
from the sound level meter directly
into a Microsoft Excel spreadsheet,
and to produce basic graphs.
Fig.1 System setup for printing, recording and transferring results from the sound level
meter
entation. Th e clock can be set directly
from the front panel of the sound level m eter, or over t h e digi tal in terfa c e.
AC & D C Ou tpu ts
The AC output from the sound level
meter is the unweighted output signal from the preamplifier. This can
Auto-start
The real-time clock has a timer feature which allows you to set up the
sound level meter so that it automatically starts measuring at a predefined point in time (up to one month
ahead) .
be recorded on a DAT recorder, and
used for further spectral analysis and
noise source identification.
The DC output is the analogue
equivalent of whatever parameter is
currently being measured, except
that it does not include the correction
for the range and the microphone K-
Data Storage & Processing
factor.
For each individual measurement,
the sound level meter logs the time,
L
, and depending on the version,
eq
MaxL a nd MaxP, or L
and L90. This
10
information is stored as a set. You
can store up to 21600 sets of results
(for example, 6 hrs logging at 1 s in-
tervals) in the sound level meter’s
Printin g R esu lts
Once you’ve finished measuring you
can print your results, either on the
lightweight Graphics Printer Type
2318, Serial Printer Types WQ 1138,
EQ4001 or EQ4002, or any standard
serial pr inter.
128Kbyte non-volatile memory. These
results can be transferred in a
spreadsheet-compatible format via
the built-in serial interface to a PC
for additional analysis or graphical
presentation.
Simplified Calibration
The sound level meter employs a very
user-friendly calibration technique.
Once you have fitted the calibrator
(Sound Level Calibrator Type 4231,
Multifunction Acoustic Calibrator
Interfacing to External Devices
The sound level meter communicates
to external devices via the interface.
By using the 9-pole to LEMO Cable
AO 0404, and 9-pole Cable with 25-
Type 4226 or a similar calibrator),
the sound level meter calculates the
correction and prompts you either to
continue with the old calibration, or
do an automatic re-calibration.
pole Adaptor AO 1386 you can easily
connect the sound level meter to
Graphics Printer Type 2318, a PC or
a serial printer.
Optional Features
The AC output of the sound level
meter can also be connected to a DAT
recorder via LEMO to BNC Cable
AO0403.
Internal Filters
Type 2236 is also available with nine
built-in
1
/1-oct ave fi lter s at 1/1-octav e
Reporter
TM
Software
This, more comprehensive software,
allows you to generate reports from
the measurement results obtained
from the sound level meter and display them.
Accredited Calibration
The sound level meter can also be
sold with an accredited calibration
that conforms to IEC651 and
IEC804.
Example Printout
Fig. 2 shows a print out from G raph-
ics Printer Type 2318 for a Level Distribution measurement.
Micros oft is a regi stered t radem ark of Micr o-
soft Cor poratio n
ig.2 Printer (24 character/line) output
ormat with short heading
2
Specifications 2236
STANDARDS:
Conforms with IE C 651 (1979) and 804 (198 5)
Type 1, and ANSI S1.4 – 1983 and D raft S1.43,
6th September, 1992 Type 1
1
/1-octave filter set conforms with IEC225–1966
and ANSI S1.11–86, order 3, Type 1–D (Types
2236 C and 223 6 D only)
• Measuring range and quasi-analogue bar
showing input signal
• Batter y low, pause and overload with hold indicators
• Time weighting and elapsed measurement
time
• Fre quency weighting (Peak or RMS ) or filter
centre frequency (only available with Types
2236 C and 2236 D), selected parameter with
level
Optional b ack-light
The quasi-ana logu e bar i s update d 15 times p er
second
Displayed parameter level updated once per second
PARAMETERS:
Common (and UKi only): MaxL, MinL, MaxP,
Peak, SPL, L
of measurement time
Specific:
, SEL, L
eq
and Overload in %
EP,d
Int.USAUKeJap.
L
Im
✓✓✓✓
Inst.✓
IEL✓✓✓
LAE✓
LCE✓
LLE✓
L
AV,4
L
AV,5
Var iab l e L
Defaults
(fixed for
Int. Versi on )
N
L
95
L
5
✓
✓✓
✓✓✓
L
L
90
L
L
90
L
50
50
L
10
1
L
95
L
50
L
5
Resolution:
Va lu es : 0.5dB
L
N
Other Par ameters: 0.1 dB
EXCHANGE RATE:
Int.USAUKiUKeJap.
33, 4, 5 333, 5
RESET:
Resets Buffer (includin g elapsed time) to zero.
Warning prior to reset if e lapsed time > 1 min.
Reset when changi ng frequency or time weigh ting
Resets all results in L og, Memory and Buffer if
held down together with 〈Data〉
Optional reset when changi ng level of meas urement range (L
is without reset)
MICROPHONE:
Type 4188 prepolarized free-field
microphone
Sensitivity: –30dB re 1V/Pa ±2dB
Frequency Range: 8Hz to 12 .5k Hz ± 2dB
Capacitance: 12 pF
s not available if range ch ange
N
1
/2″ condenser
MEMORY:
40 Records of Overall Results
RESULT LOGGING:
Int.USAUKiUKeJap.
L
L
L
L
eq
MaxLL
MaxPL
Log
Log
Rate
Cap.
eq
eq
MaxLL
10
MaxPL
90
Int.USA UKiUKe Jap.
L
eq
10
90
eq
L
5
L
95
0.1s*36 m✓✓✓
1s6 h✓✓✓✓✓
10 s21/2 d✓✓✓✓
30s71/2 d✓✓✓
1m15 d✓✓✓✓✓
5m75 d✓✓✓
10 m 150 d✓✓✓✓
15 m 225 d✓✓✓
30 m 450 d✓✓✓✓
60 m 900 d✓✓✓✓
* only Leq logged at this rate
Logged To: log or inte rface
Memory Capacity: 128Kbytes (Types 2236 A
and 2236 C). Equivalent to 21600 sets of results
(for example, 6 hrs of 1s logging).
512 Kbytes (Types 2236 B and 2236 D ). Equivalent to 86400 sets of results (for example,
24hrs of 1s logging)
SERIAL INTERFACE:
Compatible with EIA – 574
Compatible with EIA–232–E wi th 2 5-p ole adap tor
Baud Rate: 1200 – 19200 (1200 – 9600 for
Japanese v ersion)
Data Bits: 8
Stop Bit: 1
Parity: None
Handshake: Hardwire, XON/XOFF or None
Output: 50mV/dB equivalent to 0 – 4.15 V
Output Resistance: 100 Ω
Output Pa ramete r: Same as the Di splayed Pa-
rameter (Detector Output on J apanese model)
Upda ted: every second (160 times/second for
Japanese model)
AC OUTPUT:
Short-circuit protected coaxial LEMO socket (series 00)
Max. Output: 0.5 V RMS correspond ing to the
top of the selected measurement range ±2dB
depending on th e microphone ’s sensitivity
Output Resistance: 100 Ω
Output: Output signal from preamplifier (L fre-
quency weighting)
CLOCK:
Real-time (calendar) and meas urement duration
Facto ry set to CET (GMT+1)
WARM-UP TIME:
<5s
SETTLING TIME:
At Range Change without Res et: <4ms
Reference Range: 50 –130dB (set automatically during ca libration sequen ce)
Reference Direction of Incidence: Frontal
Calibration Correction with Extension Cable:
0dB
ENVIRONMENTAL EFFECTS:
Storage Temperature: –25 to +70°C (–13to
+158°F)
Operating Temperature: – 10 to +50 °C (14 to
122°F)
Effect of Temperature: <0.5 dB (– 10 to + 50°C )
Effect of Humidity: <0.5dB for 30%<RH<90%
(at 40° C, 1 kHz)
VIBRATION SENSITIVITY:
<80 dB with L-weight ing at 1m/s
EFFECT OF MAGNETIC FIELD:
80 A/m (1Ørsted ) at 50Hz gives < 34d B (L)
ELECTROMAGNETIC COMPATIBILTY:
Designed to Fulfil:
Emission :
EN50081– 1: residential, commercial and light
industry (including EN55022 class B)
EN 50081 – 2: industrial environment
FCC class B part 15 J
CISPR22 class B
Immunity:
–2
EN50082– 1: residential, commercial and light
industry
prEN5 0082 – 2: industrial environment
BATTERIES:
Four 1.5V LR6/AA size alkaline cells
Lifetime (at room temperature):
Typically > 12h rs for Types 2236 A and 2236 B
Typically > 10h rs for Types 2236 C and 2236 D
International (Int.)– 002
United States (US)– 007
United Kingdom
Industrial-noise (U Ki)
United Kingdom
Environmental- an d
Industrial-noise (U Ke)
Japanese (Jap.)– 010
Meter with 128 Kbyte memo ry
Meter with 512 Kbyte memo ry
Meter with 128 Kbyte memory and
1
/1-octave filter s et
Meter with 512 Kbyte memory and
1
/1-octave filter s et
–xxx
extension refers to the particular
– 008
– 009
Brüel &Kjær reserves the right to change specifications and accessories without notice
Includes the following accesso ries:
4 × QB0013 1.5 V LR6/AA alkaline cells
Type 4188Prepolarized Free-fiel d
KE 032 3Shoulder Bag
UA 1236Protective Cover
Microphone
1
/2”
Optional Accesso ries
For Measuring:
Type 4231Sound L evel Calibrator
Type 4226Multifuncti on Acoustic Calibrator
UA 1251Tripod
UA 0801Tripod
UA 1254Micr ophone Holder (for tripod)
UA 0459Wi ndscreen (∅ 65 mm)
AO 04 08Microphone Extension Cable (3m)
AO0409Microphone Extension Cable
ZT 03 26Octave Filter Set Upgrade
Type 4189Prepolariz ed Free-field
For Transferring Results to a PC:
AO 13869-pole Cable with 25-pole Adaptor
(10m)
Microphone
1
/2”
For Recording on a DAT Recorder,
Transferring Signals to an Analyzer or Using
with Headphones:
AO 04 03LEMO to BNC Cable
For P rin ting:
Type 2318Graph ics Printe r
WQ 1138Serial Printer (Euro version)
EQ 4001Serial Printe r (US version )
EQ 4002Ser ial Printe r (UK version )
AO 04049-pole to LEMO Ca ble (for 2318)
AO 13 869-pole Cable with 25-pole Adaptor
Upgrades:
ZT 0326Octave Filter Set (for A an d B
Carrying Case :
KE 0325Carrying Case with insert for
Services available with del ivery:
EK 0102Accredited Calibration re IEC651
(for se rial pr inter )
models)
sound level meter, Sound Level
Calibrator Type 4231, Serial
Printer WQ 1138 and Tripod
UA 1251