BRUEL & KJAER 2537 User manual

August 1998
Brüel & Kjær BB1073–11
Hand-Arm Vibration Meter
Type 2537
From serial no. 2002521

0–2 Brüel & KjærHand-Arm Vibration Meter Type 2537
User Manual
Trademarks
IBM is a registered trademark of International Business Machines
Inc., USA
Copyright  1998, Brüel &Kjær Sound and 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 and Vibration Measurement A/S,
Nærum, Denmark.

BB1073–11 0–3 Hand-Arm Vibration Meter Type 2537
User Manual
4
1
Contents
About this manual and the Type 2537. Terminology.
Basic introduction to the instrument: replacing batteries, using the
buttons, reading the screen, and setting the language.
How to use the Type 2537: calibrating, taking a measurement,
reading the display, and 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 for the Type 2537.
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

BB1073–11 1–1 Hand-Arm Vibration Meter Type 2537
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

Chapter 1 – Introduction
About this Manual
1–2 Brüel & KjærHand-Arm Vibration Meter Type 2537
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 instruc-
tions for calibrating and measuring with the Type 2537.
●Chapter 4 — Data Operations: contains information
and instructions about using the data functions and AC
output, including: saving, viewing, and erasing records;
downloading records; printing measurements; and record-
ing 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 the Type 2537.
●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 Type 2537 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 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.”

Chapter 1 – Introduction
Features
BB1073–11 1–3 Hand-Arm Vibration Meter Type 2537
User Manual
1.2 Features
The Type 2537 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

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:
●Amp
●Amin
●Amax
●Aeq
●Aeq4
●Aeq8
●Peak
●Inst
You can change the displayed parameters during measure-
ment 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
information about setting up the vibration meter for meas-
urement, see section 3.5.

Chapter 1 – Introduction
Memory
BB1073–11 1–5 Hand-Arm Vibration Meter Type 2537
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.

Chapter 1 – Introduction
Backlight
1–6 Brüel & KjærHand-Arm Vibration Meter Type 2537
User Manual
The following parameters are stored in each record:
●Aeq
●Aeq4
●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
The Type 2537 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.

BB1073–11 2–1 Hand-Arm Vibration Meter Type 2537
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

Chapter 2 – Getting Started
Fitting Batteries
2–2 Brüel & KjærHand-Arm Vibration Meter Type 2537
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 is empty and blinking.
The battery level indicator has five lines of pixels (including
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
Amp 17.9 m/ss
H Aeq 7.26 m/ss
.1 316

Chapter 2 – Getting Started
Fitting Batteries
BB1073–11 2–3 Hand-Arm Vibration Meter Type 2537
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 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

Chapter 2 – Getting Started
Fitting Batteries
2–4 Brüel & KjærHand-Arm Vibration Meter Type 2537
User Manual
2.1.2 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
batteries) following the +/- orientation shown on the bot-
tom of the battery compartment.
5. Press the compartment lid back into place.
Fig.2.3 The Type 2537 with the battery lid removed

Chapter 2 – Getting Started
Fitting Batteries
BB1073–11 2–5 Hand-Arm Vibration Meter Type 2537
User Manual
Note: If you cannot switch on the vibration meter after re-
placing the batteries, check that you have inserted them
correctly. The instrument is designed so that it will not work
if the batteries are inserted incorrectly in the battery com-
partment.
2.1.3 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 bat-
tery 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
2.4). 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 hand-arm vibration meter recalibrated.

Chapter 2 – Getting Started
Pushkey Definitions
2–6 Brüel & KjærHand-Arm Vibration Meter Type 2537
User Manual
2.2 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 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 This key works like the up arrow,
except 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.
Range Press this key to step through the
available measurement ranges.

Chapter 2 – Getting Started
Pushkey Definitions
BB1073–11 2–7 Hand-Arm Vibration Meter Type 2537
User Manual
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.

Chapter 2 – Getting Started
The Measurement Window
2–8 Brüel & KjærHand-Arm Vibration Meter Type 2537
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 m/s2): all
vibrations 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 acceleration (RMS). It is updated 15 times
a second.
3. The upper end of the measurement range (in m/s2) and
overload indicator: 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 “latched overload”). To change the measurement range,
press .
Fig.2.4 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

Chapter 2 – Getting Started
The Measurement Window
BB1073–11 2–9 Hand-Arm Vibration Meter Type 2537
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 (Amp or
Peak) displayed. Press to select the displayed pa-
rameters.
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 (6.3 Hz to 5 kHz)
10. RMS parameter: Shows the type of RMS reading dis-
played (Aeq, Aeq4, Aeq8, Amax, Amin, or Inst). Press
to select the displayed parameters.
11. Value of the RMS parameter

Chapter 2 – Getting Started
Choosing the Language
2–10 Brüel & KjærHand-Arm Vibration Meter Type 2537
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2.4 Choosing the Language
The Type 2537 is fluent in five languages. Use the procedure
below to choose the language used in the instrument’s display
screen.
1. If the vibration 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