Brüel & Kjær 2239 B User manual

December 2001
Brüel & Kjær BB1224 – 11
Type 2239 B
Hand-Arm Vibration and
Integrating Sound Level Meter
Hand-Arm Vibration Functions
From serial no. 1733094
bb122411.book Page i Tuesday, December 11, 2001 2:34 PM

ii Brüel&KjærType 2239 B
Hand-Arm Vibration Functions User Manual
Trademarks
IBM is a registered trademark of International Business Machines
Inc., USA
Copyright 2001, 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.
bb122411.book Page ii Tuesday, December 11, 2001 2:34 PM

BB1224 – 11 iii Type 2239 B
Hand-Arm Vibration Functions User Manual
Contents
Chapter 1
Introduction ....................................................................................................................... 1
1.1 About this Manual ................................................................................................... 2
1.2 Features................................................................................................................... 3
1.3 Parameters............................................................................................................... 4
1.4 Settings ................................................................................................................... 4
1.5 Memory................................................................................................................... 5
1.6 Backlight.................................................................................................................. 6
Chapter 2
Getting Started .................................................................................................................7
2.1 Switching Between Sound and Vibration Functions .................................................. 8
2.2 Fitting Batteries ....................................................................................................... 8
2.3 Pushkey Definitions................................................................................................ 13
2.4 The Measurement Window.................................................................................... 15
2.5 Choosing the Language ......................................................................................... 17
Chapter 3
Taking Measurements ..................................................................................................19
3.1 Calibration............................................................................................................. 20
3.2 Mounting the Accelerometer ................................................................................. 22
3.3 Taking Measurements............................................................................................ 23
3.4 Reading the Parameters ......................................................................................... 28
3.5 Making Measurement Settings............................................................................... 30
Chapter 4
Data Operations .............................................................................................................37
4.1 Working with Records............................................................................................ 38
4.2 Using a Portable Printer.......................................................................................... 46
4.3 Transferring Records to a Computer....................................................................... 50
4.4 Using the AC Output ............................................................................................. 53
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iv Brüel & KjærType 2239 B
Hand-Arm Vibration Functions User Manual
Chapter 5
Maintenance and Troubleshooting ........................................................................ 55
5.1 Service and Repair ................................................................................................. 56
5.2 Care, Cleaning and Storage................................................................................... 56
5.3 Troubleshooting .................................................................................................... 57
5.4 Warnings and Error messages................................................................................ 58
Chapter 6
Specifications .................................................................................................................. 61
6.1 Specifications......................................................................................................... 62
6.2 Ordering Information............................................................................................. 65
Chapter 7
Quick Reference ............................................................................................................. 67
7.1 The Measurement Window.................................................................................... 68
7.2 Displayed Parameters............................................................................................. 69
7.3 Set-up Functions Flow Chart.................................................................................. 72
7.4 Measurement Range Flow Chart............................................................................ 74
7.5 Data Functions Flow Chart..................................................................................... 75
Chapter 8
Index ................................................................................................................................... 79
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BB1224 – 11 1 Type 2239 B
Hand-Arm Vibration Functions User Manual
Chapter 1
Introduction
bb122411.book Page 1 Tuesday, December 11, 2001 2:34 PM

Chapter 1 – Introduction
About this Manual
2Brüel & KjærType 2239 B
Hand-Arm Vibration Functions User Manual
1.1 About this Manual
1.1.1 Summary of Contents
This manual describes the hand-arm vibration monitoring
functions of Type 2239B. For instructions about using the in-
strument as a sound level meter, see Type 2239A manual (also
included with your instrument).
To switch from a sound level meter to a vibration meter, simply
exchange the microphone and preamplifier assembly for the
accelerometer and charge amplifier assembly (see section 2.1).
●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. It also explains how
to switch from using the instrument for measuring sound
levels to measuring hand-arm vibration.
●Chapter 3 – Taking Measurements: gives instructions for
calibrating and measuring with the Type 2239B.
●Chapter 4 – Data Operations: contains information and
instructions about using the data functions and AC output,
including: saving, viewing, and erasing records; download-
ing records; printing measurements; and recording to DAT.
●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 Type 2239B.
●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
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Chapter 1 – Introduction
Features
BB1224 – 11 3 Type 2239 B
Hand-Arm Vibration Functions User Manual
1.1.2 Conventions Used in this Manual
All references to buttons on Type 2239B are shown with the
button’s pictogram as it appears on the instrument. Refer to
section 2.3 for a complete list of button pictograms and their
functions.
Text that refers directly to text on the instrument’s screen or
printouts is indicated using a Courier type face.
For example, “Press until Aeq is visible on the screen.”
1.2 Features
Type 2239 B contains several features that enable you to take
and save hand-arm vibration measurements under a variety
of conditions. Features include:
●Ease of use
●Two measurement ranges
●Eight measured parameters (see below)
●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
●Records can be downloaded in a standard spreadsheet
format
●AC output for DAT recording
●Five built-in languages
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Chapter 1 – Introduction
Parameters
4Brüel & KjærType 2239 B
Hand-Arm Vibration Functions User Manual
1.3 Parameters
The following parameters are monitored during measurement
and can be viewed selectively:
●Amp
●Amin
●Amax
●Aeq
●Aeq4
●Aeq8
●Peak
●Inst
You can change the displayed parameters during measurement
by pressing the key. For more information about selecting
and reading the parameters, see section 3.4.
1.4 Settings
The following settings are available:
●Measurement range
●Frequency 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 in-
formation about setting up the vibration meter for measure-
ment, see section 3.5.
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Chapter 1 – Introduction
Memory
BB1224 – 11 5 Type 2239 B
Hand-Arm Vibration Functions User Manual
1.5 Memory
The vibration 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 results from the last measurement. It is cleared
each time you start a measurement or turn off the instrument.
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.
The following parameters are stored in each record:
●Aeq
●Aeq4
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Chapter 1 – Introduction
Backlight
6Brüel & KjærType 2239 B
Hand-Arm Vibration Functions User Manual
●Aeq8
●Amp
●Amin
●Amax
●Frequency weighting
●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
Type 2239B 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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BB1224 – 11 7 Type 2239 B
Hand-Arm Vibration Functions User Manual
Chapter 2
Getting Started
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Chapter 2 – Getting Started
Switching Between Sound and Vibration Functions
8Brüel & KjærType 2239 B
Hand-Arm Vibration Functions User Manual
2.1 Switching Between Sound and
Vibration Functions
Type 2239B is capable of measuring both sound and vibration.
To turn the instrument into a vibration meter:
1. Unscrew the cone-shaped nut at the base of the preampli-
fier at the top of the meter. Do not try to unscrew the
preamplifier itself. Unscrew the nut until it is free from the
body of the instrument.
2. Gently pull the preamplifier away from the instrument.
3. Plug the charge amplifier into the socket that is now ex-
posed at the top of the instrument. Make sure the pins in
the preamplifier line up with the holes in the socket.
4. Tighten the cone-shaped nut at the base of the charge
amplifier. Use finger torque; do not over-tighten.
5. The instrument automatically enables its vibration meas-
uring features and will behave as described in this manual.
To return to sound meter functionality, reverse the above pro-
cedure. It will then behave as described in the Type 2239A
manual.
2.2 Fitting Batteries
2.2.1 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 is empty and blinking.
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Chapter 2 – Getting Started
Fitting Batteries
BB1224 – 11 9 Type 2239 B
Hand-Arm Vibration Functions User Manual
The battery level indicator has five lines of pixels (including
the tip). Each line represents approximately 2.5 hours of re-
maining battery time (at room temperature). When the indi-
cator is blinking, there is less than one hour left. Under
extreme cold or hot environments, the remaining time may be
less.
Fig.2.1 Type 2239B as a hand-arm vibration meter
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Chapter 2 – Getting Started
Fitting Batteries
10 Brüel & KjærType 2239 B
Hand-Arm Vibration Functions 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
vibration meter in a dry place.
●Never mix different makes or types of battery.
●Never mix charged and discharged batteries.
Fig.2.2 Location of the battery level indicator
Fig.2.3 Interpreting the battery level indicator
Battery Level Indicator
RUN 00:05:41
Amp 17.9 m/ss
H Aeq 7.26 m/ss
.1 316
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
BB1224 – 11 11 Type 2239 B
Hand-Arm Vibration Functions User Manual
2.2.2 Replacing Batteries
To replace the batteries:
1. Make sure the instrument is switched off.
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.
4. Insert new batteries (four 1.5 V LR6/AA size alkaline bat-
teries) following the +/– orientation shown on the bottom
of the battery compartment.
5. Press the compartment lid back into place.
Note: If you cannot switch on the vibration meter after replac-
ing the batteries, check that you have inserted them correctly.
Fig.2.4 Type 2239B with the battery lid removed
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Chapter 2 – Getting Started
Fitting Batteries
12 Brüel & KjærType 2239 B
Hand-Arm Vibration Functions User Manual
The instrument is designed so that it will not work if the
batteries are inserted incorrectly in the battery compartment.
2.2.3 The Back-up Battery
The vibration 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 vibration meter. It is fully charged
after about 10 hours. Fully charged, the back-up battery runs
the clock and retains records and settings for about 6 months.
(These charge times are typical for an instrument 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
2.5). 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
hand-arm vibration meter recalibrated.
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Chapter 2 – Getting Started
Pushkey Definitions
BB1224 – 11 13 Type 2239 B
Hand-Arm Vibration Functions User Manual
2.3 Pushkey Definitions
To control the instrument, you must use the pushkeys on the
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 weighting,
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 This key works like the up arrow, ex-
cept it decrements the available num-
bers 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.
Range Press this key to step through the
available measurement ranges.
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Chapter 2 – Getting Started
Pushkey Definitions
14 Brüel & KjærType 2239 B
Hand-Arm Vibration Functions User Manual
Measure / Cancel While viewing the Measurement Win-
dow or saved records, press this key
to step through the available meas-
urement 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 Win-
dow, 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 backlight
switches off automatically after 30
seconds.
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Chapter 2 – Getting Started
The Measurement Window
BB1224 – 11 15 Type 2239 B
Hand-Arm Vibration Functions User Manual
2.4 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 m/s2): all
vibrations below this level will register as under range. To
change the measurement range, press while measure-
ment is stopped.
2. Quasi-analogue display: shows a graphical representation
of the current acceleration (RMS). It is updated 15 times
a second.
3. The upper end of the measurement range (in m/s2) 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 continuously (this is called a
Fig.2.5 The Measurement Window
RUN 00:05:41
Amp 17.9 m/ss
H Aeq 7.26 m/ss
.1 316
7
5
8
6
910 11
13 42
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Chapter 2 – Getting Started
The Measurement Window
16 Brüel & KjærType 2239 B
Hand-Arm Vibration Functions User Manual
“latched overload”). To change the measurement range,
press .
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 measure-
ment. 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 (Amp or
Peak) displayed. Press to select the displayed param-
eters.
8. Value of the peak parameter
9. Frequency weighting: Two frequency weightings are avail-
able. The current setting is shown here. Possible settings
are:
●H: Hand-arm vibration weighting (5 Hz to 1500 Hz)
●L: Linear (6.3Hz to 5kHz)
10. RMS parameter: Shows the type of RMS reading displayed
(Aeq, Aeq4, Aeq8, Amax, Amin, or Inst). Press to select
the displayed parameters.
11. Value of the RMS parameter
bb122411.book Page 16 Tuesday, December 11, 2001 2:34 PM