BRUEL & KJAER 2239 A User manual

English BB1219–11
Integrating Sound Level Meter Type 2239 A
bb121911.book Page 1 Tuesday, July 24, 2001 11:23 AM

July 2001
Brüel & Kjær BB 1219 – 11
Integrating Sound Level Meter
Type 2239 A
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Brüel & KjærIntegrating Sound Level Meter Type 2239 A
User Manual
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BB 1219 –11 iii Integrating Sound Level Meter Type 2239 A
User Manual
Contents
Chapter 1
Introduction ....................................................................................................................... 1
1.1 About this Manual ................................................................................................... 1
Summary of Contents .................................................................................. 1
Conventions Used in this Manual ................................................................. 2
1.2 Features................................................................................................................... 2
1.3 Parameters............................................................................................................... 3
1.4 Settings ................................................................................................................... 3
1.5 Memory................................................................................................................... 4
Set-up Memory ............................................................................................ 4
Buffer .......................................................................................................... 4
Records........................................................................................................ 4
Backlight...................................................................................................... 5
Chapter 2
Getting Started ................................................................................................................. 7
2.1 Fitting Batteries........................................................................................................ 7
Checking the Battery Level ........................................................................... 7
Replacing Batteries ....................................................................................... 9
The Back-up Battery ................................................................................... 10
2.2 Button Definitions.................................................................................................. 11
2.3 The Measurement Window.................................................................................... 13
2.4 Choosing the Language ......................................................................................... 15
Chapter 3
Taking Measurements .................................................................................................. 17
3.1 Calibration............................................................................................................. 17
When to Calibrate...................................................................................... 17
Principle of Calibration ............................................................................... 17
Free- and Diffuse-Field Measurements........................................................ 18
Which Calibrators Can I Use? ..................................................................... 18
Calibrating Type 2239 A............................................................................. 18
3.2 Taking Measurements............................................................................................ 21
Manually Timed Measurements.................................................................. 21
Taking Preset-Period Measurements ........................................................... 22
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iv Brüel & KjærIntegrating Sound Level Meter Type 2239 A
User Manual
Overload Conditions .................................................................................. 24
3.3 Reading the Parameters ......................................................................................... 25
3.4 Measurement Settings ........................................................................................... 28
Setting the Measurement Range ................................................................ 28
Setting the Frequency Weighting ............................................................... 29
Setting the Time Weighting ....................................................................... 31
Setting the Measurement Time .................................................................. 32
Setting the Time and Date ......................................................................... 34
3.5 Influence of Instrument and Operator .................................................................... 35
Chapter 4
Data Operations ............................................................................................................. 37
4.1 Working with Records ........................................................................................... 37
Saving Records........................................................................................... 37
When All Records are Full .......................................................................... 39
Recalling a Stored Record........................................................................... 39
Erasing Records.......................................................................................... 41
4.2 Using a Portable Printer ......................................................................................... 43
To Make a Print ......................................................................................... 44
Reading the Printout .................................................................................. 45
4.3 Transferring Records to a Computer ...................................................................... 46
Connecting to a Computer ........................................................................ 46
Transferring Results with Third Party Software............................................ 48
4.4 Using the AC Output ............................................................................................. 49
To Record Measured Sound to a DAT......................................................... 49
To Monitor the Measurement with Headphones ........................................ 51
Chapter 5
Introduction ..................................................................................................................... 53
5.1 Service and Repair ................................................................................................. 53
5.2 Care, Cleaning and Storage ................................................................................... 53
Storing the Instrument ............................................................................... 54
Cleaning the Instrument ............................................................................ 54
Handling the instrument ............................................................................ 54
5.3 Warnings and Error messages ................................................................................ 54
Chapter 6
Specifications .................................................................................................................. 57
6.1 Specifications......................................................................................................... 58
6.2 Ordering Information............................................................................................. 65
Chapter 7
Quick Reference ............................................................................................................. 67
7.1 The Measurement Window.................................................................................... 67
7.2 Measurement Range Flowchart.............................................................................. 68
7.3 Displayed Parameters............................................................................................. 69
Parameter Definitions................................................................................. 69
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BB 1219 –11 v Integrating Sound Level Meter Type 2239 A
User Manual
Possible Weightings ................................................................................... 70
Displayed Parameter Flowchart................................................................... 71
7.4 Set-up Functions Flowchart .................................................................................... 71
7.5 Data Functions Flowchart....................................................................................... 74
Chapter 8
Index ................................................................................................................................... 77
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vi Brüel & KjærIntegrating Sound Level Meter Type 2239 A
User Manual
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BB 1219 –11 1 Integrating Sound Level Meter Type 2239 A
User Manual
Chapter 1
Introduction
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 information
including: replacing batteries, using the buttons, reading
the screen, and setting the language.
●Chapter 3 – Taking Measurements: gives instructions for
calibrating and measuring with Type 2239 A.
●Chapter 4 – Data Functions: contains information and
instructions about using the data functions and AC output,
including: saving, viewing, and erasing records; download-
ing 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.
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Chapter 1 –Introduction
Features
2Brüel & KjærIntegrating Sound Level Meter Type 2239 A
User Manual
●Chapter 6 –Specifications: a comprehensive listing of
technical specifications of type 2239 A.
●Chapter 7 –Quick Reference: contains several flowcharts
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 Type 2239 A are shown with the
button’s pictogram as it appears on the instrument. See sec-
tion 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.”
1.2 Features
Type 2239 A contains several features that enable you to take
and save sound level measurements under a variety of condi-
tions. Features include:
●Ease of use
●Three measurement ranges
●Seven measured parameters (see section 1.3)
●A- or C-weighted RMS measurements in parallel with C-weighted
peak
●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 section 1.5.3)
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Chapter 1 –Introduction
Parameters
BB 1219 –11 3 Integrating Sound Level Meter Type 2239 A
User Manual
●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
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 measurement
by pressing . LIm is displayed instead of Leq when an Im-
pulse time weighting is used. For more information about se-
lecting and reading the parameters, see section 3.3.
1.4 Settings
The following settings are available:
●Measurement range
●Frequency weighting for the RMS detector
●Time weighting
●Preset time
●Time and date
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Chapter 1 –Introduction
Memory
4Brüel & KjærIntegrating Sound Level Meter Type 2239 A
User Manual
You can change the measurement range by pressing . You
can change the other settings through windows that are dis-
played when you press . Settings cannot be changed while
the instrument is measuring. For more information about set-
ting up the sound level meter for measurement, see section 3.4.
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
The buffer holds all the measurement results from the last
measurement period. It is cleared each time you start a meas-
urement 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 measurement over a preset time
interval) or manually (at any time after a measurement is
stopped).
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Chapter 1 –Introduction
Memory
BB 1219 –11 5 Integrating Sound Level Meter Type 2239 A
User Manual
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.
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 :
●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.
1.5.4 Backlight
Type 2239 A 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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6Brüel & KjærIntegrating Sound Level Meter Type 2239 A
User Manual
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BB 1219 –11 7 Integrating Sound Level Meter Type 2239 A
User Manual
Chapter 2
Getting Started
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.
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
8Brüel & KjærIntegrating Sound Level Meter Type 2239 A
User Manual
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 rows of pixels in it (includ-
ing the tip). Each line represents approximately 2.5 hours of
remaining battery time (at room temperature). When the indi-
cator is blinking, there is less than one hour left. In extremely
cold or hot environments, the remaining time may be less.
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
BB 1219 –11 9 Integrating Sound Level Meter Type 2239 A
User Manual
2.1.2 Replacing Batteries
To replace the batteries:
1. Make sure the sound level meter is switched off by press-
ing (you will need to stop any measurement first).
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.
3. Remove all of the old batteries.
Fig.2.3 Type 2239 A with the battery lid removed
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Chapter 2 –Getting Started
Fitting Batteries
10 Brüel & KjærIntegrating Sound Level Meter Type 2239 A
User Manual
4. Insert new batteries (four 1.5 V LR6/AA size alkaline bat-
teries) following the +/- orientation shown in the bottom
of the battery compartment.
5. Press the compartment lid back into place.
Note: If you cannot switch the sound level meter on 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 battery
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 24 hours. Fully charged, the back-up bat-
tery runs the clock and retains records and settings for about
6months.
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
Button Definitions
BB 1219 –11 11 Integrating Sound Level Meter Type 2239 A
User Manual
2.2 Button Definitions
To control the sound level meter, you must use the buttons
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 button to switch the in-
strument on or off. The instrument
will begin measuring as soon as it
starts up. Power cannot be switched
off while measuring.
Calibrate Press this button to calibrate your
instrument. See section 3.1 for cali-
bration instructions.
Settings Press this button to step through the
measurement settings windows. With
these windows you can adjust the
measurement time, frequency
weighting, time weighting, and cur-
rent date and time.
Up Arrow Press this button to make changes in
the settings, data, or calibration win-
dows. When recalling records, use
this button to step through the dis-
played records. It increments the
available numbers and choices.
Down Arrow Press this button to make changes in
the settings, data, or calibration win-
dows. When recalling records, use
this button to step through the dis-
played records. It decrements the
available numbers and choices.
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Chapter 2 –Getting Started
Button Definitions
12 Brüel & KjærIntegrating Sound Level Meter Type 2239 A
User Manual
Data Records Press this button to step through the
data windows. With these windows
you can store, recall, erase, print
and/or download records of your
measurements.
Range Press this button to step through the
available measurement ranges.
Measure / Cancel While viewing the Measurement Win-
dow or saved records, press this but-
ton to step through the available
measurement parameters.
While viewing any of the calibration,
data, or settings windows, press this
button to exit to the Measurement
Window without changing any set-
tings.
Start / Stop / OK While viewing the Measurement Win-
dow, press this button to start or
stop a measurement.
While viewing any of the calibration,
data, or setting windows, press this
button to perform the displayed ac-
tion (e.g., Erase All Records) or apply
all new settings you have made.
While viewing saved records, press
this button to return to the Measure-
ment Window.
Backlight Switches the display’s backlight on
or off. To save batteries, the back-
light switches off automatically after
30 seconds.
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Chapter 2 –Getting Started
The Measurement Window
BB 1219 –11 13 Integrating Sound Level Meter Type 2239 A
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 measure-
ment is stopped.
2. Quasi-analog 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 over-
load indicator: Peaks above this level will trigger an over-
load warning. If an overload has occurred in the last
second, this number will change to read “OVL”for the
duration of the next second. If an overload has occurred
at any time during a measurement in progress, then this
number will blink (this is called a “latched overload”). To
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
910 11
13 42
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