MMF VM30-H User manual

Instruction Manual
*How to find the version of your instrument: page 47
Manfred Weber
Metra Mess- und requenztechnik in Radebeul e.K.
Meissner Str. 58 - D-01445 Radebeul
Phone [phone] ax [phone]
Email: Info@MM .de Internet: www.MM .de
Human
Vibration
Meter
VM30-H
rom Version 02.02.xxx.xxx*

The latest edition of this document can be found under:
http://www.mmf.de/product_literature.htm
© Manfred Weber
Metra Meß- und Frequen technik in Radebeul e.K.
May/ 12 #193

Contents
1. Purpose....................................................................................................................................1
2. The Instrument at a Glance.......................................................................................................1
3. Menus......................................................................................................................................2
4. Fundamentals of Human Vibration Measurement ...................................................................4
4.1. Introduction.......................................................................................................................4
4.2. EU Directive 2002/44/EC..................................................................................................4
5. Human Vibration Measurement with the VM30-H..................................................................7
5.1. Switching On and Connecting the Sensor .........................................................................7
5.2. Hand-Arm Vibration Measurement with the VM30-H......................................................8
5.2.1. Measuring Points for Hand-Arm Vibration ................................................................8
5.2.2. Settings on the VM30-H.............................................................................................9
5.2.3. Reporting of Measuring Results................................................................................10
5.3. Whole-Body Vibration Measurement with the VM30-H.................................................11
5.3.1. Measuring points for Whole-Body Vibration............................................................11
5.3.2. Settings at the VM30-H............................................................................................12
5.3.3. Evaluation of Health Risks........................................................................................14
5.3.4. Comfort Evaluation...................................................................................................15
5.3.5. Reporting of Measuring Results................................................................................15
6. Switching the Instrument On and Off.....................................................................................16
7. Sensor Input...........................................................................................................................16
8. Display...................................................................................................................................17
9. Signal Setup...........................................................................................................................18
9.1. Vibration Quantity...........................................................................................................18
9.2. Filters..............................................................................................................................18
9.2.1. Weighting Filters......................................................................................................18
9.2.1.1. Weighting Filter Wb ..........................................................................................18
9.2.1.2. Weighting Filter Wc ..........................................................................................19
9.2.1.3. Weighting Filter Wd...........................................................................................19
9.2.1.4. Weighting Filter We...........................................................................................20
9.2.1.5. Weighting Filter Wg...........................................................................................20
9.2.1.6. Weighting Filter Wh...........................................................................................21
9.2.1.7. Weighting Filter Wj...........................................................................................21
9.2.1.8. Weighting Filter Wk...........................................................................................22
9.2.1.9. Weighting Filter Wm..........................................................................................22
9.2.1.10. Combined Weighting Filters............................................................................23
9.2.2. Band-Pass Filters......................................................................................................23
9.3. Display Modes.................................................................................................................24
9.3.1. Running RMS...........................................................................................................24
9.3.2. Maximum Transient Vibration Value (MTVV)........................................................24
9.3.3. Interval RMS (A(T)).................................................................................................24

9.3.4. Estimated Vibration Dose Value (eVDV).................................................................25
9.3.5. Vibration Total Value (Ahv).....................................................................................26
9.3.6. Peak Value (PEAK)..................................................................................................26
9.3.7. Maximum Peak Value (PEAK↑)...............................................................................27
9.3.8. Crest Factor (CREST)...............................................................................................27
9.4. Saving User-Defined Setups............................................................................................27
9.5. Loading User-Defined Setups..........................................................................................28
10. Measuring Range and Autoranging......................................................................................28
11. Overload Indication..............................................................................................................29
12. Saving Measuring Results....................................................................................................29
12.1. Manual Recording by the SAVE Key............................................................................29
12.2. Automatic Recording in the Data Logger Mode............................................................30
12.3. Viewing Saved Measurements on the Display...............................................................30
13. Data Transmission to the PC................................................................................................31
13.1. Preparing the Import of Data into Excel........................................................................31
13.2. Importing VM30-H Data with the Excel Macro ...........................................................31
13.3. Calculation of the Daily Exposure Value A(8)..............................................................33
13.4. Function of the Excel Macro ........................................................................................36
13.5. Transmission to PC by a Terminal Program..................................................................37
14. Time and Date......................................................................................................................38
15. Calibration and Function Check...........................................................................................39
15.1. Entering Transducer Sensitivities .................................................................................39
15.2. Sensitivity Calibration by a Vibration Calibrator ..........................................................39
15.3. Mechanical Calibration..................................................................................................40
15.4. Electrical Calibration.....................................................................................................40
15.5. Function Check..............................................................................................................43
16. Other Settings ......................................................................................................................43
16.1. Beep Sound On / Off.....................................................................................................43
16.2. Automatic Shut-Off Timer.............................................................................................44
16.3. Battery Type..................................................................................................................44
16.4. Factory Settings.............................................................................................................44
16.5. Baud Rate......................................................................................................................44
17. Serial Interface.....................................................................................................................44
18. Signal Output.......................................................................................................................44
19. Power Supply.......................................................................................................................45
19.1. Battery Operation..........................................................................................................45
19.2. External Supply.............................................................................................................46
20. Loading Default Settings......................................................................................................46
21. Hardware Reset....................................................................................................................46
22. Hardware and Firmware Versions .......................................................................................47
23. Firmware Update .................................................................................................................47
24. Questions and Answers........................................................................................................49

25. Technical Data.....................................................................................................................50
Appendix: Warranty
Declaration of Conformity

1. Purpose
Thank you for choosing a vibration meter from Metra!
The VM30-H was developed for the measurement of human vibrations. In addition, it is suited
for many other fields of vibration measurement such as machine vibration, building vibration or
quality control.
The instrument can measure triaxial hand-arm vibration to EU directive 2002/44/EC based on
ISO 5349 and whole-body vibration to ISO 2631. It conforms to the latest edition of ISO 8041
for measuring instrumentation for human vibration.
Particular attention has been paid to simple operation, compact design and long battery
operating time.
2. The Instrument at a Glance
Figure 1: Key functions
Figure 2: Connections
1
Sensor
input
External
supply
Analog
output
RS-232
interface
Battery cover
SAVE: Record measuring values
ESC: Leave menues without change,
Reset maximum and long-term values
LOAD: Load user-defined setups
LOCK: Key lock on / off
MENU: Setup
LIGHT: Display backlight
IN O: Memory occupancy, time, date, version
RANGE: Change / save signal settings
ON / O : On (hold 2 s) / Off
Press strongly
to open the
battery compartment

Figure 3: Battery compartment and reset button
3. Menus
2
Battery compartment
Reset
MENU
1/8: Gain Gain Range X
Main Menu
Select time unit Log duration
3/8: View memory
Manually by SAVE key with / without comment with / without time with / without date
Log interval
(password protected)
Gain Range Y Gain Range Z
by data logger
2/8: Recording setup
Log file title
4/8: Erase memory
5/8: Time and date
6/8: Load defaults
7/8: Sensor
By vibration calibrator
By transducer sensitivity
8/8: Device Settings 1/6: Beeper on / off
2/6: Shut-off timer
3/6: Battery type
4/6: actory settings
5/6: Baud rate
Edit this sensor?Sensor selection
no
yes
Nominal sensitivity
1
10
mV/ms²
Entry after sensor connection
Sensor name
X/Y/Z
6/6: irmware update

3
Si nal Setup Menu
RANGE
Human Vibration
Acceleration
Velocity
Displacement
Selection of the
vibration quantity
ilter Band filters and
weighting filters for
selected vibration
quantity
Running RMS (1 s)
Max. running RMS
Interval RMS
stimated vibr. dose
Total vibration value
Peak value (1 s)
Max. peak value
Crest factor
RMS
MTVV
A(T)
eVDV
Ahv
PEAK
PEAK
CREST
Enter Ahv k factors
Save settings? No
Yes
Factors kx, ky und kz
for Ahv only
Save as: Setup No. Save as setup
number 0 to 9
Enter setup name Setup name
20 characters

4. Fundamentals of Human Vibration Measurement
4.1. Introduction
Vibrations acting on the human body are called human vibration. The main purpose of
measuring human vibration is the prevention of health risks and the evaluation of comfort, for
example in vehicles.
Two categories are distinguished:
•Hand-Arm Vibrations, which are induced via the hands into the body. They may cause,
for example, circulatory disorder, bone, joint or muscle diseases.
•Whole-Body Vibrations, acting via the buttocks, the back and the feet of a sitting person,
the feet of a standing person or the back and the head of a recumbent person. Such
vibrations may cause backache or damage to the spinal column.
Both types of human vibration are described in international standards:
•ISO 5349 - Measurement and evaluation of human exposure to hand-transmitted vibration
•ISO 2631 - Evaluation of human exposure to whole-body vibration
•ISO 041 - Human response to vibration. Measuring instrumentation
•ISO 662 - Hand-held portable power tools - Measurement of vibrations at the handle
•ISO 6954 - Guidelines for the measurement, reporting and evaluation of vibration with
regard to habitability on passenger and merchant ships
•ISO 10056 - Measurement and analysis of whole-body vibration to which passengers and
crew are exposed in railway vehicles
•ISO 10326 - Laboratory method for evaluating vehicle seat vibration
Practical advice for measurement and evaluation of human vibration can be found in VDI 2057.
The subject of human vibration has gained particular importance in Europe since the directive
2002/44/EC came into effect. It specifies the duties of employers with regard to workers
protection.
4.2. EU Directive 2002/44/EC
The following text is an abstract of Directive 2002/44/EC of the European Parliament and of the
Council dated June 25 2002. The complete text can be downloaded from
http://eur-lex.europa.eu/
The directive lays down minimum requirements for the protection of workers from the risks
arising from vibrations. Manufacturers of machines and employers should make an adjustment
regarding risks related to exposure to vibration.
The directive lays down the following limit values:
4

Hand-Arm Vibration Whole-Body Vibration
Exposure Action Value 2.5 m/s² 0.5 m/s²
Exposure Limit 5 m/s² 1.15 m/s²
Once the exposure action value is exceeded, the employer shall establish and implement a
program of technical and and organi ational measures intended to reduce to a minimum
exposure to mechanical vibration, taking into account in particular:
•Other working methods that require less exposure to mechanical vibration
•Appropriate work equipment of ergonomic design, producing the least possible vibration
•Provision of auxiliary equipment that reduces the risk of injuries, such as protective gloves
or special seats
•Appropriate maintenance programs for work equipment
•Design and layout of workplaces
•Adequate information and training to instruct workers to use work equipment correctly and
safely
•Limitation of the duration and intensity of the exposure
•Work schedules with adequate rest periods
•Provision of clothing to protect workers from cold and damp
In any event, workers shall not be exposed above the exposure limit value. If this should be the
case, the employer shall take immediate action to reduce exposure below the exposure limit
value.
The methods used may include sampling, which must be representative of the personal exposure
of a worker to the mechanical vibration in question.
The assessment of the level of exposure to vibration is based on the calculation of daily
exposure A( ) expressed as equivalent continuous acceleration over an eight-hour work period.
For the determination of A(8) it is not necessary to measure over eight hours. It is sufficient to
make short-term measurements during representative work steps. The results are normali ed to
eight hours. Daily exposure is calculated as follows:
Equation 1
where
awe is the energy equivalent mean value of the frequency weighted acceleration during the
exposure
Te is the total duration of exposure during one work day
T0is the reference duration of 8 hours
5
A8=awe

Te
T0