BRUEL & KJAER 2236 A-008 User manual

bb090813.book : Front Black 3
October 1996
Brüel & Kjær BB0908–13
Precision Integrating
Sound Level Meter
Type 2236 A–008
Type 2236 B–008
Type 2236 C–008
Type 2236 D–008
With software version 2.1 or higher

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User Manual
Trademarks
IBM is a registered trademark of International Business Machines
Inc., USA
Copyright © 1993, 1996, Brüel&Kjær Sound & Vibration
Measurement A/S
All rights reserved. No part of this publication may be reproduced
or distributed in any form, or by any means, without prior consent
in writing from Brüel & Kjær Sound & Vibration Measurement A/S,
Nærum, Denmark.

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BB0908–13 0–5 Precision Integrating Sound Level Meter Type 2236
User Manual
4
1
Contents
Describes the sound level meter and its general operating principles.
A familiarization guide which explains, step by step, a typical
measurement.
How to prepare the sound level meter for measuring.
How to calibrate and measure with the sound level meter.
What you are able to do with your results.
The specifications and information regarding other equipment
available for use with the sound level meter.
Service and repair of the sound level meter.
Explains specific terminology used in the manual and contains
instructions on how to control the sound level meter from a
computer.
Useful Information
2
An Example Measurement
3
Setting Up the SLM for Measurement
Measuring
5
Storing and Transferring Results
6
Specifications
7
Service and Repair
8
Appendices

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User Manual
Index
Fold
Out
Controls, Display and Sockets
An overview of the sound level meter’s pushkeys, controls and main
display.

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BB0908–13 1–1 Precision Integrating Sound Level Meter Type 2236
User Manual
Chapter 1
Useful Information
1.1 About this Manual.............................................................. 1 – 2
1.2 About the Type 2236 Sound Level Meter................. 1 – 2
Parameters......................................................................... 1 – 2
Settings .............................................................................. 1 – 3
Data Operations ................................................................ 1 – 6
Memory .............................................................................. 1 – 8
1.3 Practical Hints...................................................................... 1 – 9

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Chapter 1 – Useful Information
About this Manual
1–2 Brüel & KjærPrecision Integrating Sound Level Meter Type 2236
User Manual
1.1 About this Manual
Figures are used to guide you through using the pushkeys.
Please note the following when using the figures:
n×Press this pushkey n times
OK Press this to save any changes made in connection with
the Settings or 〈Data〉pushkeys
NO Press this to return to the screen indicated without sav-
ing any changes made
1.2 About the Type 2236 Sound Level
Meter
1.2.1 Parameters
Precision Integrating Sound Level Meter Type 2236 is a Type
1 sound level meter complying with BS 5969 and BS 6698. It
can measure the following parameters:
●MaxL: maximum SPL since the last reset
●MinL: minimum SPL since the last reset
●MaxP: maximum Peak level since the last reset
●Peak: maximum Peak level in 1s interval
●SPL: maximum RMS level in 1s interval (according to
IEC 651)
●Leq: equivalent continuous sound level (Leq according to
IEC 804)
●SEL: Sound Exposure Level (if A-weighted, then = LEA,
according to IEC 804)
●LEPd: Daily Personal Noise Exposure Level (see section
8.2)
●Ovl: Input signal overloading instrument (% of the meas-
urement time)

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Chapter 1 – Useful Information
About the Type 2236 Sound Level Meter
BB0908–13 1–3 Precision Integrating Sound Level Meter Type 2236
User Manual
In addition, Precision Integrating Sound Level Meter Types
2236 C–008 and 2236 D–008 contain 1/1-octave filter sets
between 31.5Hz and 8kHz which comply with BS 2475 (1964).
They can measure all the above-mentioned parameters in
each of the filter bands.
1.2.2 Settings
Checking and Changing the 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 principle (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 Range Reset
●Contrast
●Exposure Time
●Interface
●Output Formats
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 〈▲〉and 〈▼〉, respectively (see Fig. 1.1).
Changing
When you reach a Setting you want to change, press 〈Edit〉.
A cursor ( ) appears on the first set-up line you can change.

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Chapter 1 – Useful Information
About the Type 2236 Sound Level Meter
1–4 Brüel & KjærPrecision Integrating Sound Level Meter Type 2236
User Manual
If there are other set-up lines on the screen, you can move
the cursor to them using Level 〈▲〉and 〈▼〉.
When the cursor is on the set-up line of the Setting you want
to change, press Parameter 〈▲〉and 〈▼〉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 previous set-up.
Fig.1.1 Principle of checking and changing the sound level meter’s Set-
tings
931007/1e
Edit
Edit
Parameter
Level
Level or Parameter
Show or Parameter
Show
Parameter ▼
▼▼
▼
▼
▼
Previous
Setting
Previous
parameter
Next
Setting
Next
parameter
AUTO LOGGING
-every 1 s.
to log
▼
AUTO LOGGING
-every 1 s.
to log
30 .... 110
00:00:00
F SPL 58.6 dBA
(Leq MaxL MaxP)
(Leq MaxL MaxP)

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Chapter 1 – Useful Information
About the Type 2236 Sound Level Meter
BB0908–13 1–5 Precision Integrating Sound Level Meter Type 2236
User Manual
Fig. 1.2 shows an overview of the available Settings.
Fig.1.2 An overview of the sound level meter’s Settings
930721/2e
30 .... 110
PAUSE 00:00:00
F SPL 58.6 dBA
OUTPUT FORMATS
INTERFACE
EXPOSURE TIME
CONTRAST
PEAK WEIGHTING
DATE/TIME
AUTO START
CHANGE RANGE
OK Show Show
Show
OK OK
Show OK
Show OK
Show OK
Show OK
Show
OK
NO
Show
OK Show
OK Show
AUTO LOGGING
CALIBRATION
NO
NO
NO
NO NO
NO
NO
NO
NO

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1–6 Brüel & KjærPrecision Integrating Sound Level Meter Type 2236
User Manual
Fast Edit
In addition to the normal way of changing the set-up of a
Setting (that is, pressing 〈Show〉, stepping through to the
desired Setting and pressing 〈Edit〉), you can also use two
pushkeys together to “fast edit” a Setting (that is, go directly
to a Setting with the edit cursor).
If you press 〈Edit〉and, within 3 seconds, the pushkey indi-
cated in Table 1.1, the selected Setting appears with the edit
cursor ( ). You can now check and change the set-up of the
Setting as described earlier in this section. When you have
finished changing the Setting, pressing 〈NO〉or 〈OK〉, how-
ever, returns you to the main screen.
1.2.3 Data Operations
The 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 its
Settings (see section 1.2.2) except that you press 〈Data〉in-
stead of 〈Show〉. In addition, the sound level meter returns
to the main screen after you have accepted changes to the
Fast Edit Pushkey (Edit +) ... ... Goes to Setting
Level ▲or ▼
Parameter ▲or ▼(Disp. param.: Peak, MaxP)
Parameter ▲or ▼(Disp. param.: LEP,d)
Data
OK
Calibration
Peak Frequency Weighting
Exposure Time
Output Formats
Change Range with Reset
Contrast
Auto Start
Status (only via Fast Edit)
Table 1.1 Fast edit pushkeys and the Settings accessed Where display
parameters are shown in parenthesis (for example, (Disp. par-
am.: LEP,d)), then the display must be showing the indicated
parameter (in this example, LEP,d) when the Fast Edit keys are
pressed to go to the indicated setting (in this example, Exposure
Time).
▼
0
▼