Atec 2236 User Manual

Product Data

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 RANGES:

Range

(dB)

Max.

Upper limit (RMS ) for
Peak
level

signals with crest
factor = 10 (20dB)

10* – 90 93 73

20† – 100 103 83

30 – 110 113 93
40 – 120 123 103
50 – 130 133 113
60 – 140 143 123

* Only available with Types 2236 C and 2236 D when

filter selected.
Level non-linearity caused by noise floor is <0.4 dB at
30 dB(A) (re IEC 651) and < 1 dB at 26 dB(A)

† Level non-linearity caused by noise floor is <0.4 dB at

30 dB(A) (re IEC 651) and < 1 dB at 26 dB(A)

NOISE FLOOR:
Typically: 18dB (A)
Maximum: 20dB(A) RMS

Includes preamplifier ’s electrical noise and mi­crophone’s thermal noise

DETECTORS:

Simultaneous RMS and Peak with independent
frequency weightings

Linea rit y Ra nge: 80 dB
Pulse Range: 83 dB
Non-linear Distortion: Too small to affec t ac-

curacy

Peak Detector Rise Time: <50µs
FREQUENCY WEIGHTING:

Selected independen tly for RMS and Peak

RMS:

A, C according to IEC 651 Type 1
L: flat from 10 Hz to 20k Hz (± 2 d B) with Type 1
tolerances

Peak:

C according to IEC 651 Type 1
L: flat from 10 Hz to 20k Hz (± 2 d B) with Type 1
tolerances

FILTER (only available with Types 2236 C and
2236 D):
Band-pass Filters: Nine

1

/1-octave intervals (base 10)
Centre Frequencies: 31.5, 63, 125, 250,
500 Hz, 1, 2, 4, 8 kHz

Maximum Noise Floor in Each Frequency
Band:

1

/1-octave filters at

See diagram for details

25

20

15

Noise/dB

10

31.563 125 8 k CA LIN
Frequency Hz

941683e

TIME WEIGHTING:

Int. USA UKi UKe Jap.

S, F, I S, F, I S, F S, F, I S, F, I

according to

IEC 651 Typ e 1

DISPLAY:

4 line LCD showing:

• 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. USA UKe Jap.

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. USA UKi UKe Jap.

3 3, 4, 5 3 3 3, 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. USA UKi UKe Jap.

L

L

L

L

eq

MaxL L
MaxP L

Log

Log

Rate

Cap.

eq

eq

MaxL L

10

MaxP L

90

Int. USA UKi UKe Jap.

L

eq
10
90

eq

L

5

L

95

0.1s*36 m ✓ ✓ ✓
1s 6 h ✓ ✓ ✓ ✓ ✓
10 s 21/2 d ✓ ✓ ✓ ✓
30s 71/2 d ✓ ✓ ✓
1m 15 d ✓ ✓ ✓ ✓ ✓
5m 75 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

Result
Output
Formats

Int. USA UKi UKe Jap.

Overall ✓ ✓ ✓ ✓ ✓
Logged

(Printer)
Logged

(2318)

Logged

✓ ✓ ✓ ✓ ✓

✓ ✓ ✓ ✓ ✓

✓ ✓ ✓ ✓ ✓

(Spreadshe et)
Level

Distribut ion
Cumulative

✓ ✓ ✓

✓ ✓ ✓

Disribu tion

Distribution
Resolution
(dB)

Heading: Long or short (only short for USA
model)

DC OUTPUT:

Short-circuit protected coaxial LEMO socket (se­ries 00)

1 or 5 1 or 5 0.5, 1,

2, 5,

10

3

B

K

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

CALIBRATION CONDITIONS:
Reference Frequency: 1000 Hz
Reference SPL: 94dB

Ordering Information

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 (–13 to

+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

Internal back-up battery:
Charging time: ~ 10h ours (1st t ime)

Keeps clock and memories operating for at least
6mo nths (typically) if fully charged

EXTERNAL POWER SUPPLY:

Must fulfil the following speci fications

Voltage: regulated or smoothed 7 –15 V DC
Voltage Ripple: <100m V peak to p eak
Maximum Current: 400 mA
Average Current: ~100 mA at 7 V
Socket:

Pin: Positive
Casing: Signal Ground
Pin Diameter: 2.0 mm
External Diameter: 5.5mm

PHYSICAL CHARACTERISTICS:
Size: 25 7× 97 × 41 mm
Weight: 460g (including batteries)

2236A –xxx Precision Integrating Sound Level
2236B –xxx Precision Integrating Sound Level
2236C –xxx Precision Integrating Sound Level

2236D –xxx Precision Integrating Sound Level

The

English-languag e version.

Vers io n – xxx Extension

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 4188 Prepolarized Free-fiel d

KE 032 3 Shoulder Bag
UA 1236 Protective Cover

Microphone

1

/2”

Optional Accesso ries

For Measuring:
Type 4231 Sound L evel Calibrator
Type 4226 Multifuncti on Acoustic Calibrator
UA 1251 Tripod
UA 0801 Tripod
UA 1254 Micr ophone Holder (for tripod)
UA 0459 Wi ndscreen (∅ 65 mm)
AO 04 08 Microphone Extension Cable (3m)
AO0409 Microphone Extension Cable

ZT 03 26 Octave Filter Set Upgrade
Type 4189 Prepolariz ed Free-field

For Transferring Results to a PC:
AO 1386 9-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 03 LEMO to BNC Cable

For P rin ting:
Type 2318 Graph ics Printe r
WQ 1138 Serial Printer (Euro version)
EQ 4001 Serial Printe r (US version )
EQ 4002 Ser ial Printe r (UK version )
AO 0404 9-pole to LEMO Ca ble (for 2318)
AO 13 86 9-pole Cable with 25-pole Adaptor

Upgrades:
ZT 0326 Octave Filter Set (for A an d B

Carrying Case :
KE 0325 Carrying Case with insert for

Services available with del ivery:
EK 0102 Accredited 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

and IEC 804

Brüe l & Kjær

WORLD HEADQUARTERS:

DK-2850 Naerum · Denmark · Telephone: [phone] · Fax: [phone] · Internet: http://www.bk.dk · e-mail: [e-mail]

Australia (02 ) 9450-2066 · Austria 00 43-1-865 74 00 · Belgium 016/44 92 25 · Brazil [phone] · Canada: [phone] · China 10 6841 9625 / 10 6843 7426
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Hungary (1) 215 83 0 5 · Italy (0 2) 57 60 414 1 · Japan 03 -3779-8671 · Republic of Korea (0 2) 3473-0 605 · Norway 66 90 4410 · P oland (0- 22) 40 93 92 · Portuga l (1) 47114 53
Singapore (65) 275-8816 · Slovak Republic 07-37 6181 · Spain (91) 36810 00 · Sweden (08) 71127 30 · Switzerland 01/94 0 09 09 · Taiwan [phone]
United Kingdom and Ireland [phone] 6 · USA 1 - 800 - 332 - 2040
Local representatives and service organisations worldwide

–