Brüel & kjær 2236 Guide

~

Technical

~

------------------------

~

Precision lntegration Sound Levet Meter

F Type 2236

iX

lnternational Version

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Contents

Useful Information

Describes

the

sound

level

meter

and

its

general

operating

principles.

An

Example Measurement

A farniliarization guide which explains,

step

by

step,

a

measurement

according

to

ISO1996.

Setting

Up the SLM for Measurement

How

to

prepare

the

sound

level

meter

for measuring.

Measuring

How to

calibrate

and

maasure

with

the

sound

level

meter

.

Storing and Transferring Results

What

you

are

able to do

with

your

results.

Specifications

The

specifications

and

infonnation

regarding

other

equipment

available for

use

with

the

sound

level meter.

Service and Repair

Service

and

repair

ofthe

sound

level

meter.

Appendices

Explains

specific

tenninology

used

in

the

manual

and

contains

instructions

on

how to control

the

sound

level

meter

from a

computer.

880902-12

Precision lntegrating Sound Level MeterType 2236

UserManual

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Index

Controls, D

isp

lay

and

Sock

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An

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Chapter 1

Useful

Information

1.1 About

th

is Ma

nua

l

1-2

1.2

About

the

Type

2236

Soun

d

Leve

l

Meter

....

............. 1- 2

Parame

ters......................................................................... 1- 2

Settings

.............................................................................. 1 - 3

D

ata

Opera

tions

................................................................

1-

7

Me

mory

........................................

..

.................................... 1- 8

1.3

Practica

l

Hint

s ] .. 10

--------

··

----

-

980902

-12 Precision lnlegraling Sound Level

Meler

Type

2236

User

Manual

1-1

·-

1

....

..

--

-

..

Chapter

1-

Usefi.tl

Inform

at

ion

About

this

Manual

1.1

About

this

Manual

Figures

are

used

to

guide

you

through

us

ing

the

pushkeys.

Please

note

the

following

when

using

the

figures:

nx

Press

this

pushkey

n

times

;

OK

Press

this

to

sav

e

any

changes

made

in

conncction

with

the

Setting

s

or

(

Data)

pushkeys

NO

Pre

ss

this

to

return

to

the

screen

indicated

without

sav-

ing

any

ch

anges

made

1.2

About

the

Type

2236

Sound

Level

Meter

1.2.1

Parameters

1- 2

Precision

I

ntcgrating

Sound

Level

Meter

'!Ype

2236

is

a

Type

1

sound

levcl

metcr

complying

with

IEC

651 (1979)

and

804

(1985),

and

ANSIS

1.4-1983

and

Draft

S 1.43,

6th

Sept.,

1992.

lt

can

me

as

urc

the

following

parameters:

•

MaxL:

maximum

SPL

since

the

last

r

esc

t

•

Mi

n:

.:

minimum

SPL

sincc

the

la

st

reset

•

~1<"1xf':

maximum

Pcak

lcvcl

.since

th

e

last

rcsct

•

l'cak:

ma

ximum

Peak

level

in

l s

intervul

•

SPL:

maximum

RMS

le

ve

l

in

l s

interval

(

according

to

IE

C651)

• L.eq:

equivalent

conti

nuous

sound

level (

Leq

according

to

IEC

804)

•

Lirr.:

equi

va

l

ont

continuous

impulse

so

und

level

(if

time

wcightin

g is

1)

(L

1m

according

to

IEC

804,

Appendix

B)

•

SCL:

Sound

Exposure

Level

(if

A-we

ighted,

then

=LEA'

accordin

g

to

IEC

804)

Precision lnlegraling

So

und Level MeterType 2236

User Manual B

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Chapter

1-

Usefullnformation

About

th

e

Type

2236

Sound

Level

Meter

• I EL:

Impulse

Sound

Exposure

Level

(if

time

weighting

is

1)

•

LEPd:

Daily

Personai

Noise

Exposure

Level (see section

8.3)*

•

L95:

RMS

level exceeded 95%

of

the

measur

ement

time

(Lg5}t

•

L5:

RMS

level

exceeded 5%

ofthe

measurement

time

(L

5

)t

• OVL:

Input

signal

overloading

instrument

(%

of

the

meas-

urement

time)

In

addition,

Precision

Int

egr

ating

Sound

Level M

ete

r Types

2236

C-002

and

2236 D- 002

contain

111-octave

filter

sets

between

31.5Hz

and

8kHz

which comply

with

lEC

225

(1966)

and

ANSIS

1.11-1986.

They

can

measure

all

the

above-men-

tioned

parameters

in

each

of

the

filter

bands.

1

1.2.2

Settings

"<,A-s~~u

Checking

and

Changing

th

e

Settings

The

sound

level

meter

's

Settings

are

additional

to

the

basic

measurement

set-up.

They

are

very

useful

and

are

based

on

a

very

simple

principl

e (see

the

example

in

Fig

. 1.1).

There

are

ten

of

them

in

all:

•

Auto

Logging

•

Calibration

•

Peak

Weighting

• Date and

Time

• Auto

Start

•

Change

Rang

e R

eset

•

Coutrnst

• Exposur·c

Timc

•

Interface

' Nol avanable with 1

time

weighllng

t Nol available with 1time we

ig

hting

8609

02- 12 Predsion lntegraling

~o

und

level

Meter Type 2236

User Manual

1-3

l-

1

...

,___

....

_-.;

...

-

..

Chapt.er

1-

Useful

Infonnation

About

the

Type

2236

Sound

Level

Meter

•

Output

Fonnats

Checking

You

can

check

the

first

of

the

sound

level

meter's

Settings

by

pressing

the

{Show)

pushkey.

You

can

then

step

through

them

by

pressing

(Show).

However,

the

Settings

are

cyclic

and

you

can

step

forwards

and

backwards

through

them

us-

ing

Parameter

(.Å.)

and

('Y), respective)y

(see

Fig. 1.1).

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Paramcler@

Nexl

parametar

931007/ts

Fig. 1.1

Principle

of'

checking

and

changing

tlw

smmd

level

meter's

Set-

lin.gs

1-4

Changing

When

you

reach

a

Setting

you

want

to

change,

press

(Edit).

A

cursor

(

..

)

appears

on

the

first

set-

up Iine

you

can

change.

lf

there

are

other

set-up

Iines on

the

screen,

you

can

move

the

cursor

to

them

using

Level

(.Å.)

and

('Y).

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Chapter

1-

Useful

Information

About

the

Type

2236

Sound

Level

Meter

j

When

the

cursor

ison

the

set-up

line

ofthe

Setting

you

want

to

change,

press

Parameter

(.Å.)

and

{'Y)

to

step

through

the

available

parameters.

You

can

also

step

through

them

by

pressing

(Edit)

(see

Fig. 1.1).

When

you

have

the

set-up

you

desire

for

that

Setting,

press

(OK)

to

save

the

changes

and

check

the

changed

Setting.

An

accept

cursor

(•)

replaces

the

edit

cursor

(

~)

to

show

that

the

sound

level

meter

has

accepted

the

change.

If

you

change

a

Setting

by

mistake,

press

(NO)

instead

of

(OK)

to

revert

to

its

Fig. 1.2

shows

an

overview

of

the

available

Settings.

880902-12

Precision lntegrating Sound Level MeterType

2236

User

Manual

1-5

·-

1

.-

..........

Chapter

1-

Useful

Inform

ation

......

About

the

Type

2236

Sound

Level

Meter

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An

ouerview

of

t

he

sound

level meter's Se

tt

ings

1- 6 Precision lntegrating Sou

nd

level

Meter Type 2236

Use

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Chapter

1-

Usefullnform.ation

About

the

Type

2236

Sound

Level

Meter

Fast

Edit

In

addition to

the

normal

way

of

changing

the

se

t;..up

of

a

Setting

(i.e.

pressing

(Show),

stepping

through

to

the

desired

Setting

and

pressing

(Edit)),

you can

also

use

two

pusb.keys

together

to

"fast

edit" a

Setting

(i.e. go directly to a

Setting

with

the

edit

cursor).

lf

you

press

(Edit)

follo

we

d

by

the

pushkey

in<lica

ted

in

Table

1.1,

the

selected

Setting

appears

with

the

edit

cursor

(

~)*.

You can

now

check

and

change

the

set-up

ofthe

Setting

as

described

earlier

in

this

section.

When

you

have

finished

changing

the

Setting,

pressing

(NO)

or

(OK),

however, re-

turns

you to

the

main

sc

re

en.

Fast

Edit

Pushkey

(Edit

+) ... •

••

Goes

to

Setting

Levei.Å.

or

T Calibration

Parameter

.Å.

or

T (Oisp. param.: Peak, MaxP)

Parameter

.Å.

or

"f'

(Disp. param.:

LEP

,dl

Data

PeakFrequencyWelghting

Exposure Time

i

!l.

'

OK

Output Formats

Change Range with Reset

Contrast

Auto Start

Status (only

vi

a Fast Edit)

Thble 1.1 Fast

edit

pushk

eys

and

the

Settings accessed

1.2.3

Data

Operations

BB0902-

t2

Th

e

sound

level

meter

's

(

Data}

pushkey

allows

you

to

print

your

measurement

results

(

data

)

and

control

the

sound

level

meter

's memory.

It

operates

on

a

similar

principle as Se

ttings

(see section 1.2.2) except

that

you

press

(Data}

in

s

tead

of

(Show).

ln

addition,

the

sound

level

meter

return

s to

the

main

screen

after

you

ha

ve accepted

changes

to

the

se

lected

operation.

There

are

four

data

operations,

each

with

its

own

screen:

•

Print

• You musl press the

pu

shkey wilhln

3s

of

pressing(

Edll

) lorthe fast edit lunction to work.

Precision lntegrat

in

g

~

o u

n

d

le

vel

Meter Type 2236

Us

er

Manua! 1- 7

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.._.

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_,

1

Chapte:r

1-

Useful

Information

About

the

Type

2236

Sound

Level

Meter

-------------

•

Store

•

Recall

•

Erase

Fig. 1.3

shows

an

ovcrvicw

of

the

data

operations.

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Hr.C,,tt.

Jll

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....

lJO

PliUSE

00:00:00

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10

Fig. 1.3

An

oueroiew

of

the

data

operations auailable uia

the

Data

push-

key

1.2.4

Memory

1-8

The

sound

level

meter

has

three

types

of

memory:

•

Buffer

Precision lnlegrating Sound Level MeterType2236

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~

-

~

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~

~~

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-

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1

~

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~

~!

~

~'~

1

~

~ -

~

f!

i

-

~

~-

~

E '

~

·

~

E

~

.. ..

......

-

• Log

•

Memory

..

&..a

.....

'-=-

Chapter

1-

UsefullnformatJon

About

the

Type

2236

Souod

Level

Meter

Buffer

Log

Contains

the

set-up

and

all

results

for

the

current

measure--

ment

(Le. since

the

last

reset)-

see

section 1.2.1.

From

tbese,

tbe

Overall

Results

are

calculated. The

buffer

is

updated

once

a second.

Contains

the

automatically

Logged

Results

(see section 5.5.2):

•

Leq

•

MaxL

•

MaxP

•

measurement

time

of

result

s

Precision

Integrating

Sound

Level

Meter

Types 2236

A-002

and

C-002

can

contain

up

to

21600

sets

of

results

(i.e.

up

to

64800

results

with

their

measurement

times).

This

is

enough

to

log,

for

example,

6hour

s

of

Leq•

MaxL

an

d Max:P

values

logged

every

second.

Precision

Integrating

Sound

L

eve

l

Meter

Types

2236

B-002

and

D-002

can

contain

up

to

86400

sets

of

results

(i.e.

up

to

259200

result.s

with

their

measurement

times). This is

enough

to log, for

example,

24hours

of

Lcq

•

MaxL

and

MaxP

values

logged

every

second.

Memory

880902-12

Contains

the

Overall

Results

which you

have

manually

stored

in

a Record

together

with

the

set

-up.

Can

contain

up

to

40

Records.

Precision lntegratingSound

level

MeterType 2236

UserManual

1-9

--

1

~-

.-.

...

.-.

..

...

Chapter

1-

Useful

Information

Practical

Hints

1.3

1-10

Overall

Results

consist

of:

•

MaxL

•

Frequency

weighting

of

RMS

•

MinL

signa

l

MaxP

•

Frequency

weighting

of

Peak

•

signal

'

• Leq

(or

Llm

)

Time

weighting

•

SEL

(or

IEL

)

Measurement

range

•

LEP,d

E

lap

sed

measurement

time

•

Exposure

Time

Start

date

and

time

of

meas-

•

• Ovl

urement

• L5 •

Number

of

pauses

during

•

L95

measurement

Practical

Hints

Th~

sound

lcvcl

met<~r

is

dcsigned

as

a self-

contained

unit

to

mect

Lhe

rcquircmcnt.s

giv(

~

n

in

IEC 651

nnd

similar

national

standards.

Howcver,

some

of

thc

requirements

given

in

the

standards

are

based

on

measurements

of

pure

tones

under

free field

co

ndi

tions.

Pr

actical

meas

urements

under

similar

conditions

requir

c

the

following c

xt

ra

precauti

ons:

•

do

not

stand

close

to

the

sound

lcvel

meter

• do

not

use

a

windscreen

or

protcctive

cover

•

increa

se

the

distance

between

the

microphone

and

the

tripod

(c.g.

by

using

Tripod

Arm

UA1246)

•

using

a

microphon

e

extension

cable,

increase

the

distance

between

the

microph

one

and any

objccts

which

can

cause

disturbances

The

influence

ofyour

presence

on

the

measurement

can

easily

bc

chcckcd

by

chunging

the

distance

bctwcen

you

and

the

microphone

and

observing

the

change

in

the

measured

sound

pressure

levcl.

If

your

position inftucnces

the

measurement

rcsult,

then

use a microphone

extcnsion

cablc

or

spatially

Precision lnlegrating Sound Level Meter Type 2236

UserManual Bruel &Kjrer

~--

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~

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E

~

..

...

-----

Wl

Chapter

1-

Useful

Information

Praetical

Hints

average

your

measurements.

Note

that,

when

dealing

with

pure

tones, a

small

change

in

the

position

of

the

microphone

can

influence

the

result

ju

st

as

mu

ch

as

your

physical pres-

ence.

Fortunately,

the

combination

of

free

sound

field

and

pure

tones

is

very

rare.

Wi.th

sound

coming

from

several

directions

and

as

you

are

measuring

over

a

broad

frequency

band,

the

inftuence

of

the

sound

level

meter'

s

hou

sing,

tripod

and

user

becomes insignificant,

and

the

above

precautions

need

not

be

taken

.

Figs.

6.8

and

6.9

show

the

influence

of

Tripod

UA0801

and

Protective

Cover

UA

1236

under

free field conditions

and

with

pure

tones

.

1

880902-12

Precision lntegraling

~und

Level Meter Type 2236

UserManuat

1-11

-

.-

...........

·-

--

.._

1

Chap

t

er

1-

Usefullnfo

rmation

Practi

c

al

Hints

1 - 12 Precision lntegrating Sound

le

vel MeterType 2236

UserM

anual

.....

-

BrOel

&

Kj!llr

~

~'~

~

-

l

-

~

~-h

;+~

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1

~

1

~

'

~

!

~

!

~

1

- 1

~

t:

;

~

t!

~

.........

.-.

...

.--...-.-.

..........

Chapter 2

An

Example

Measurement

2.1

Introduction

.

.....

...

......

..

...

..

...

.....

..

.........

.

.....

.

.....

.

...

..

........

.

2-

2

2.2

Making

a

Measurement

.......

...

.

..

.

.....

...

....

.

....

.

....

...

.

...

..

2- 2

680902-12

Precisionlntegrating Sqund

levet

Meter Type 2236

UserManual

2-1

-

1

-

........

.

.....

.._,

Chapter

2-An

Example

Measurement

..

......

...

lntroduction

2.1

2.2

2- 2

Introduction

This

ch

apte

r

guides

you

t

hrough

the

basic

functions

of

the

sound

lev

el

meter

by

instructing

you

on

how

to

make

a

noise

measurement

in

a free

sound

fie

ld

according

to

ISO

1996. You

can

find

further

infonnation

on

the

various

steps

in

the

rel-

evant

sections

of

the

User

Manual.

lt

is

a good idea

to

have

th

e fold

out

back

cover

open

so

that

you

have

an an

notated

illus

tratio

n

of

the

sound

level

meter

in

fron

t

of

you

while

you

follow

the

exampl

e

measur

emen

t.

We

have

as

s

umed

t

ha

t

the

soun

d lev

el

meter

is

swit

ched

off

and

ha

s

not

been

used

before following

these

instruct

ions

.

lf

it

has,

ensure

that

you

are

using

the

d

efau

lt

set-up

(see

section 3.3)

be

fore following

the

steps

below.

We

ha

ve

al

so

ass

umcd

that

you

will

calibrate

the

sound

level

meter

with

Soun

d Levcl

Ca

li

brato

r Type 4231

an

d t

hat

you

will

print

out

your

results

using

Seria

l

Pri

nter

WQ

11

38.

Making

a

Measurement

Turning

On

\.

Pre

ss

CD

.

The

sound

lcvel m

clcr

turns

on.

Af

ter

a sclf-

tcst,

the

sound

level

meter

is

set

up

in

Pause

mod

e

in

the

default

set

-

up

.

The

quasi-anal

ogue

scale

shows

the

input

signal

to

the

pream

plifier

and

the

displayed

p

aram

eter

shows

the

curr

ent

SPL. T

he

buffer, log

and

memory

are

emp

ty.

Since

th

e

displayed

parameter

(

SPL

)

is

a

RMS

parameter,

you

can

see

t

he

frequency

weight

ing

of

the

RMS

signal

(shown

i.n

the

bottom

right-h

and

corner

of

the

screen

).

See

th

e fo

ld

out

back

cover

for

more

details

of

the

main

scre

en.

Preclsion lntegraling Sound Level

Meter

Type

2236

UserM

anua

l Briiel &

Kjan

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l

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..

1.

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lE!~

1

l!

i

~

IJ!

I

~

1!

!

~

E

!·

~

'

·

~

!

~

'

~

!

~

!

~

·

~

~!!

~

..

s..-=:

--g --

Cl

Cha

pter

2-An

Example

Mea

su

r

ement

Making

a

Measurement

Calibrating

the

Sound

Level

Meter

2.

Press

(Show).

The

screen

shows

the

default Auto Logging

screen.

3.

Press

Parameter

(Ä ).

The

screen

chan

ges

to

the

Calibra

tion

screen.

The

current

cali

bration

factor is

shown.

4. Pr

ess

(Edit).

The

scre

en

sho

ws

the

calibration

setru

p

(see

Fig

.2.1).

CALI

BRAT

ION

Cal

ibr.

level:

....

94.0

dB

v:mg~""

Fig.2.1 The calibration set-

up

screen

5.

Read

the

correct

calibration

level from t

he

calibr

ator's

calibration

chart

and

use

Parameter

(

.&.

)

and

(

~

)

to

set

the

sou

nd

level

mcter

to

t

his

level.•

6.

Fit

the

calibrato

r

ont

o

the

soWid level

meter

and

rest

the

so

und

level

met

er

on

a

table

or

oth

er

fiat

surface.

Ensure

that

the

calibrator

fits

snugly

on

the

microphone.

7. Sw

itch

on

the

calibrator.

The

calibrator

em

i

ts

the

1kH

z

calibration

signal.

8.

Press

(OK).

Sound Level CalibraiOf Type 4231 provides a nominal calitlration signal

ol94d8

ol

1kHz.

However,each callbrator is slightly

dl11erenl.

IIis. lherelore. important to set

the

ca

libration

level to lhe one given on the

ca

libration chart for lhe calibrator

used

1

880902-12

Precision tntegr

a1ing

Stlund Level MeterType 2236

UserManual

2- 3

Brüel & Kjær 2236 Guide

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