BRUEL & KJAER 2237 User manual

BB106411.book : Front Black 1
June 1996
Brüel & Kjær BB1064–11
2237 Controller
Integrating Sound Level Meter
From serial no. 1 896 028

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0–2 Brüel & Kjær2237 Controller
User Manual
Trademarks
2237 Controller is a trademark of Brüel& Kjær A/S. Macintosh is a
registered trademark of Apple Computer, Inc. Microsoft, Windows,
and MS-DOS are trademarks of Microsoft Corporation.
Copyright 1996, Brüel & Kjær 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 A/S, Nærum, Denmark.

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User Manual
4
1
Contents
About this manual and the 2237 Controller. Terminology.
Basic introduction to the instrument: Fitting batteries, use of
pushkeys, the display, choosing the language.
How to use the 2237 Controller: Calibrating, taking a measurement,
what can be read from the display, changing the set-up.
Saving and recalling measurement results. Printing results.
Transferring results to a computer. Using the AC output.
Caring for your instrument.
Warnings and error messages.
Complete specifications of 2237 Controller.
Overviews of parameters, menus and functions.
Introduction
2
Getting Started
3
Taking Measurements
Data Operations
5
Maintenance & Troubleshooting
6
Specifications
7
Quick Reference
8
Index

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BB1064–11 1–1 2237 Controller
User Manual
Chapter 1
Introduction
1.1 About this Manual.............................................................. 1 – 2
Summary of Contents........................................................ 1 – 2
Conventions Used in this Manual .................................... 1 – 2
1.2 Features................................................................................... 1 – 3
1.3 Parameters............................................................................. 1 – 4
1.4 Settings .................................................................................... 1 – 4
1.5 Memory .................................................................................... 1 – 5
Set-up Memory .................................................................. 1 – 5
Buffer ................................................................................. 1 – 5
Records............................................................................... 1 – 5
1.6 Backlight ................................................................................. 1 – 6

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Chapter 1 – Introduction
About this Manual
1–2 Brüel & Kjær2237 Controller
User Manual
1.1 About this Manual
1.1.1 Summary of Contents
●Chapter 1 – Introduction: provides a general overview
of the instrument and its functions.
●Chapter 2 – Getting Started: provides basic informa-
tion including: replacing batteries, using the buttons,
reading the screen, and setting the language.
●Chapter 3 – Taking Measurements: gives instructions
for calibrating and measuring with the 2237 Controller.
●Chapter 4 – Data Functions: contains information and
instructions about using the data functions and AC out-
put, including: saving, viewing, and erasing records;
downloading records; printing measurements; recording
to DAT; and monitoring with headphones.
●Chapter 5 – Maintenance and Troubleshooting: gives
care, cleaning and storage instructions, and a table of error
messages together with their causes and solutions.
●Chapter 6 – Specifications: a comprehensive listing of
technical specifications for the 2237 Controller.
●Chapter 7 – Quick Reference: contains several flow
charts and some brief descriptions to help you find the
settings you need when working with the instrument.
●Chapter 8 – Index
1.1.2 Conventions Used in this Manual
All references to buttons on the 2237 Controller are shown
with the button’s pictogram as it appears on the instrument.
Refer to section 2.2 for a complete list of button pictograms
and their functions.
Text which refers directly to text on the instrument’s screen
or printouts is indicated using a Courier type face.
For example, “Press until MaxP is visible on the screen.”

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Chapter 1 – Introduction
Features
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User Manual
1.2 Features
The 2237 Controller contains several features that enable you
to take and save sound level measurements under a variety
of conditions. Features include:
●Ease of use
●Three measurement ranges
●Seven measured parameters (see below)
●Fast, Slow, and Impulse time weightings
●Easy to read display with backlight
●Preset measurement time up to eight hours
●Storage of up to 40 records (see below)
●Serial port for printing or downloading records to a com-
puter
●Downloading records in a standard spreadsheet format
●AC output for headphone monitoring or DAT recording
●Five built-in languages

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Chapter 1 – Introduction
Parameters
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User Manual
1.3 Parameters
The following parameters are monitored during measurement
and can be viewed selectively:
●Leq (LIm)
●MaxP
●Peak
●MaxL
●MinL
●SPL
●Inst
You can change the displayed parameters during measure-
ment by pressing the key. The LIm parameter is displayed
instead of Leq when an Impulse time weighting is used. For
more information about selecting and reading the parame-
ters, see section 3.3.
1.4 Settings
The following settings are available:
●Measurement range
●Time weighting
●Preset time
●Time and date
You can change the measurement range by pressing the
key. You can change the other settings through windows that
are displayed when you press the key. Settings can not
be changed while the instrument is measuring. For more
information about setting up the sound level meter for meas-
urement, see section 3.4.

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Chapter 1 – Introduction
Memory
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User Manual
1.5 Memory
The sound level meter has three kinds of memory
●Set-up
●Buffer
●Records
1.5.1 Set-up Memory
The set-up memory is used to store the date and time, last
settings used, and the language selection. This memory is
maintained by the backup battery, so it is saved when you
turn off the instrument. The date and time are stored directly
in the real time clock, which is also powered by the backup
battery.
1.5.2 Buffer
Holds all of the measurement results from the last measure-
ment period. It is cleared each time you start a measurement
or turn off the sound level meter. Results in the buffer can
be output to a printer or copied into a record.
1.5.3 Records
Up to 40 records of measurement results can be stored in
memory. Records are copied from the buffer. They can be
stored automatically (after a preset-timed measurement) or
manually (at any time after a measurement is stopped).
The records are stored in non-volatile memory, which is pow-
ered by the backup battery. All records are preserved when
you turn off the instrument.

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Chapter 1 – Introduction
Backlight
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User Manual
The following parameters are stored in each record:
●Leq (LIm)
●MaxP
●MaxL
●MinL
●Time and frequency weightings
●Time and date of measurement
●Measurement duration
●Overload status
The following data functions are available via windows that
are displayed when you press the key:
●Save the buffer to a record
●Recall a record to the screen
●Print results of the last measurement
●Download spreadsheet data of records
●Erase last record
●Erase all records
For more information about records, see section 4.1.
1.6 Backlight
The 2237 Controller includes a backlight, which makes the
display easier to read in low light situations. Press to
turn it on or off. To save batteries, the light will switch off
automatically after 30 seconds.

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BB1064–11 2–1 2237 Controller
User Manual
Chapter 2
Getting Started
2.1 Fitting Batteries .................................................................. 2 – 2
Checking the Battery Level .............................................. 2 – 2
Replacing Batteries ........................................................... 2 – 4
The Back-up Battery ......................................................... 2 – 5
2.2 Pushkey Definitions........................................................... 2 – 6
2.3 The Measurement Window............................................. 2 – 8
2.4 Choosing the Language .................................................. 2 – 10

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Chapter 2 – Getting Started
Fitting Batteries
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User Manual
2.1 Fitting Batteries
2.1.1 Checking the Battery Level
The battery symbol in the upper right hand corner of the
Measurement Window indicates the current battery level.
When the battery is full, the battery level indicator is fully
black. As the batteries are used, the level will fall until the
indicator is completely empty. When it is time to replace the
batteries, the indicator will be empty and blinking.
The battery level indicator has five lines of pixels in it (in-
cluding the tip). Each line represents approximately 2.5 hours
of remaining battery time (at room temperature). When the
indicator is blinking, there is less than one hour left. Under
extreme cold or hot environments, the remaining time may
be less.
Fig.2.1 Location of the battery level indicator
Battery Level Indicator
RUN 00:05:41
MaxP 94.7 dB
AF Leq 45.8 dB
30 100

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Chapter 2 – Getting Started
Fitting Batteries
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User Manual
Caution
It is possible for batteries to explode or leak if they are
handled incorrectly, so:
●For long-term storage, remove the batteries and keep the
sound level meter in a dry place.
●Never mix different makes or types of battery.
●Never mix charged and discharged batteries.
Fig.2.2 Interpreting the battery level indicator
960156e
Batteries full, about 14 hours left
Batteries half full, about 7.5 hours left
Replace batteries, less than 1 hour left

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Chapter 2 – Getting Started
Fitting Batteries
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User Manual
2.1.2 Replacing Batteries
To replace the batteries:
1. Make sure the sound level meter is switched off by press-
ing .
2. The battery compartment is located in the centre of the
back of the instrument. Press the two tabs on the upper
edge of the battery compartment and remove the lid.
Fig.2.3 The 2237 Controller with the battery lid removed

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Chapter 2 – Getting Started
Fitting Batteries
BB1064–11 2–5 2237 Controller
User Manual
3. Remove all of the old batteries.
4. Insert new batteries (four 1.5 V LR6/AA size alkaline
batteries) following the +/- orientation shown in the bot-
tom of the battery compartment.
5. Press the compartment lid back into place.
Note: If you cannot switch on the sound level meter after
replacing the batteries, check that you have inserted them
correctly. The sound level meter is designed so that it will
not work if the batteries are inserted incorrectly in the bat-
tery compartment.
2.1.3 The Back-up Battery
The sound level meter has a back-up battery for running the
clock and maintaining the records and settings, even when
it is switched off or the main batteries are removed.
The back-up battery is recharged automatically when there
are standard batteries in the sound level meter. It is fully
charged after about 10 hours. Fully charged, the back-up bat-
tery runs the clock and retains records and settings for about
6 months.
These charge times are typical for a sound level meter at
room temperature.
Important:
If the back-up battery is flat, then you will see the Set-up
Language Window when the instrument starts-up (see section
2.4). The measurement settings, date and time will also be
reset to factory-set values.
If this happens, then your instrument’s calibration may no
longer be valid. Contact your Brüel & Kjær dealer to have
your sound level meter recalibrated.

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Chapter 2 – Getting Started
Pushkey Definitions
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User Manual
2.2 Pushkey Definitions
To control the sound level meter, you must use the pushkeys
on the instrument’s front panel. Each button is marked with
a pictogram. This section gives a brief explanation of each
button.
Power Press this key to switch the instru-
ment on or off. The instrument will
begin measuring as soon as it starts-
up.
Calibrate Press this key to calibrate your in-
strument. See section 3.1 for calibra-
tion instructions.
Settings Press this key to step through the
measurement settings windows.
With these windows you can adjust
the measurement time, time weight-
ing, and current date and time.
Up Arrow Press this key to make changes in
the settings, data, or calibration win-
dows. When recalling records, use
this key to step through the dis-
played records. It increments the
available numbers and choices.
Down Arrow Press this key to make changes in
the settings, data, or calibration win-
dows. When recalling records, use
this key to step through the dis-
played records. It decrements the
available numbers and choices.
Data Records Press this key to step through the
data windows. With these windows
you can store, recall, erase, print
and/or download records of your
measurements.

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Chapter 2 – Getting Started
Pushkey Definitions
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User Manual
Range Press this key to step through the
available measurement ranges.
Measure / Cancel While viewing the Measurement
Window or saved records, press this
key to step through the available
measurement parameters.
While viewing any of the calibration,
data, or settings windows, press this
key to exit to the Measurement Win-
dow without changing any settings.
Start / Stop / OK While viewing the Measurement
Window, press this key to start or
stop a measurement.
While viewing any of the calibration,
data, or setting windows, press this
key to perform the displayed action
(e.g. Erase All Records) or apply all
new settings you have made.
While viewing saved records, press
this key to return to the Measure-
ment Window.
Backlight Switches on or off the display’s back-
light. To save batteries, the back-
light switches off automatically after
30 seconds.

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Chapter 2 – Getting Started
The Measurement Window
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User Manual
2.3 The Measurement Window
During normal operation you will use the Measurement Win-
dow to view your measured data. It provides several kinds
of information about your settings and measurements.
1. The bottom end of the measurement range (in dB): all
sound below this level will register as under range. To
change the measurement range, press while meas-
urement is stopped.
2. Quasi-analogue display: shows a graphical representation
of the current sound pressure level. It is updated 15 times
a second.
3. The upper end of the measurement range (in dB) and
overload indicator: Peaks above this level will trigger an
overload warning. If an overload has occurred in the last
one second, this number will change to read “OVL” for
the duration of the next second. If an overload has oc-
curred at any time during a measurement in progress,
then this number will blink (this is called a “latched
overload”). To change the measurement range, press .
Fig.2.4 The Measurement Window
RUN 00:05:41
MaxP 94.7 dB
AF Leq 45.8 dB
30 100
7
5
8
6
9 10 11
13 42

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Chapter 2 – Getting Started
The Measurement Window
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User Manual
4. Battery level: when the batteries are new, this indicator
is completely black. As the batteries are used, the level
falls. Replace the batteries when this indicator is empty
and blinking.
5. Run/Stop indicator: displays the current status of meas-
urement. Press to start or stop a measurement.
6. Elapsed time: the amount of time that has passed since
measurement began.
7. Peak parameter: shows the type of peak reading displayed
(MaxP or Peak). Press to select the displayed param-
eters.
8. Value of the peak parameter
9. Weightings used for the RMS parameter: Can be either
AF (“A” frequency weighted and Fast time weighted),
AS (“A” frequency weighted and Slow time weighted), or
AI (“A” frequency weighted and Impulse time weighted).
10. RMS parameter: Shows the type of RMS sound level
reading displayed (Leq (LIm), MinL, MaxL, SPL, or Inst).
Press to select the displayed parameters.
11. Value of the RMS parameter

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Chapter 2 – Getting Started
Choosing the Language
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2.4 Choosing the Language
The 2237 Controller is fluent in five languages. Use the pro-
cedure below to choose the language used in the instrument’s
display screen.
1. If the sound level meter is on, then press to switch
it off.
2. While the instrument is off, press and hold it down.
3. While holding , press .
4. Release both buttons. The instrument does a self-test as
usual and then displays the Set-up Language window.
5. Press the and/or keys until your preferred lan-
guage appears in the window. The choices are (in order):
●English
●Francais
●Deutsch
●Italiano
●Espanol
6. Press or to choose the language and proceed to
the Measurement Window.
Fig.2.5 The Set-up Language Window
SET-UP
Language
>English