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Summary of Contents for Cirrus Research revo CV31A
- Page 1 CV:31A Vibration Meter User Manual Page 1 CV:31A Vibration Meter User Manual This manual, the software to which it relates, the program code and drawings are all: © Copyright Cirrus Research plc 1989-2022...
- Page 2 The content of this manual, any illustrations, technical information and descriptions within this document were correct at the time of going to print. Cirrus Research plc reserves the right to make any changes necessary, without notice, in line with the policy of continuing product development and improvement.
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Page 3: Table Of Contents
CV:31A Vibration Meter User Manual Page 3 Introduction ......................... 5 Instrument Overview ....................5 Getting started with the CV:31A ................... 6 Switching on and Connecting the Sensor ................6 Hand-Arm Vibration Measurement with the CV:31A ............. 7 Measuring Points for Hand-Arm Vibration ................. 7 CV:31A Settings for Hand-Arm Vibration measurements ............ - Page 4 Page 4 CV:31A Vibration Meter User Manual Warranty Information....................42 Cirrus Research Offices ....................43...
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Page 5: Introduction
CV:31A Vibration Meter User Manual Page 5 Introduction The CV:31A has been developed for the measurement and analysis of human vibration. It can also be used for a range of other applications including machine condition monitoring, building vibration measurement and quality control. In combination with a tri-axial accelerometer, hand-arm and whole-body vibrations can be measured in compliance with ISO 5349, ISO 2631 and the EU Directive 2002/44/EC. -
Page 6: Getting Started With The Cv:31A
Page 6 CV:31A Vibration Meter User Manual Getting started with the CV:31A Switching on and Connecting the Sensor Switch on the CV:31A by pressing the ON/OFF key. If the sensor has not yet been connected, plug the sensor cable into the right connector. The CV:31A will start TEDS detection if the sensor is compatible with IEEE 1451.4 Template 25. -
Page 7: Hand-Arm Vibration Measurement With The Cv:31A
CV:31A Vibration Meter User Manual Page 7 Hand-Arm Vibration Measurement with the CV:31A This section will give you basic instructions for the measurement and evaluation of hand-arm vibrations based on the standard ISO 5349 and the guideline VDI 2057, Part Please consult the original documents for detailed explanations. -
Page 8: Cv:31A Settings For Hand-Arm Vibration Measurements
Page 8 CV:31A Vibration Meter User Manual Figure 9 shows the axis directions for attaching the sensor to the handle. For cylindric handles the Y direction points in the direction of the handle axis. The Z axis is approximately the extension of the third metacarpal bone. Figure 9: Coordinate system of the hand (from ISO 5349-1) CV:31A Settings for Hand-Arm Vibration measurements For the evaluation of hand-arm vibration it is recommended... - Page 9 CV:31A Vibration Meter User Manual Page 9 Pressing Reset before a measurement is mandatory to establish defined start conditions. The RMS values of X/Y/Z and the vector sum are averaged over the entire measuring time. That's why fluctuation becomes less the longer the measurement takes. After a while short shock pulses have almost no influence on the displayed results.
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Page 10: Whole-Body Measurement With The Cv:31A
Page 10 CV:31A Vibration Meter User Manual Whole-Body Measurement with the CV:31A This section will give you basic instructions for the measurement and evaluation of whole-body vibrations based on the standard ISO 2631 and the guideline VDI 2057, Part 1. Please consult the original documents for detailed explanations. The described method is suitable for all vibrations acting on the human body. -
Page 11: Cv:31A Settings For Whole-Body Vibration Measurements
CV:31A Vibration Meter User Manual Page 11 Table 2 shows the weighting filters and factors to be used for different postures and positions. Whole-Body Health Evaluation Posture Position Direction Frequency weighting Weighting factor (k) X / Y sitting seat surface Whole-Body Comfort Evaluation X / Y seat surface... - Page 12 Page 12 CV:31A Vibration Meter User Manual Appendix 2 show the frequency response curves of the filters Wd and Wk in VM31 and the tolerance bands in compliance with ISO 8041. In addition to health evaluation the VM31 also supports measurements regarding comfort.
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Page 13: Whole-Body Vibration Measurement With Vdv Values
CV:31A Vibration Meter User Manual Page 13 Measurements can only be saved if a sensor is detected at X/Y/Z and if there is no overload condition. In these cases the CV:31A will display “Sensor error” or “Overload occurred” instead of saving in order to avoid invalid recordings. If an overload occurred since the last reset (“OVL!”... -
Page 14: Seat Effective Amplitude Transmissibility (Seat)
Page 14 CV:31A Vibration Meter User Manual Seat Effective Amplitude Transmissibility (SEAT) The Seat Effective Amplitude Transmissibility (SEAT) value is the ratio of the vibration experienced on top of the seat and the vibration that one would be exposed to when sitting directly on the vibrating floor. -
Page 15: General Vibration Measurement
CV:31A Vibration Meter User Manual Page 15 General Vibration Measurement In addition to its human vibration ranges the CV:31A can measure: • Vibration acceleration from 0.1 to 2000 Hz and 1 to 1000 Hz, • Vibration velocity from 1 to 100 Hz, 2 to1000 Hz and 10 to 1000 Hz, •... - Page 16 Page 16 CV:31A Vibration Meter User Manual Figure 24: Frequency ranges of vibration acceleration Figure 25: Frequency ranges of vibration velocity...
- Page 17 CV:31A Vibration Meter User Manual Page 17 Figure 26: Frequency range of vibration displacement (upper end due to resolution) Vibration quantity and frequency range can be checked by pressing F1. Below the 3 (or 4) RMS or peak values you can see two combined values which are calculated from X/Y/Z.
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Page 18: Data Logger
Page 18 CV:31A Vibration Meter User Manual Data Logger The CV:31A can automatically record measuring data for channels X/Y/Z at the speed of the display refresh rate. It can log running RMS or peak values. Logging can be useful in combination with human vibration measurement to detect single vibration or shock events during a longer measuring period. -
Page 19: Frequency Analysis
CV:31A Vibration Meter User Manual Page 19 Frequency Analysis The CV:31A provides a simple FFT function for the detection of main frequencies. It displays a 125 line peak spectrum of acceleration. Press F3 and select “Frequency analysis” to open the FFT screen (Figure 27). -
Page 20: Time & Date
Page 20 CV:31A Vibration Meter User Manual Time & Date When saving measurement values the date and time need to be correctly recorded. To set the date and time, open the main menu by pressing F3 and select “Device settings”. Within this sub menu select “Date and time”. Using keys ▲▼... -
Page 21: Battery Replacement
CV:31A Vibration Meter User Manual Page 21 Battery Replacement The CV:31A is powered from three standard alkaline batteries size AAA (LR03). Alternatively rechargeable NiMH batteries of type HR03 can be inserted. Precise operation is guaranteed until the batteries are almost completely discharged. Please note that date and time need to be adjusted after replacing the batteries. -
Page 22: Display Brightness
Page 22 CV:31A Vibration Meter User Manual • Remove old batteries from the device, and take out the batteries if the device will not be used for a long period of time. Otherwise leaking battery acid may cause severe damage to the device. A battery indicator can be found in the upper left corner of the display. -
Page 23: Data Memory
CV:31A Vibration Meter User Manual Page 23 Data Memory Measurement data memory The CV:31A memory store up to 10,000 data records. A record includes: • Date and time • Comment (20 characters) • Filter and measuring mode • Measuring values X/Y/Z and, if available, channel A and 2 combined values (vector sum and maximum value) Saved data can be viewed on the screen. -
Page 24: Fft Data Memory
Page 24 CV:31A Vibration Meter User Manual FFT Data Memory To view stored FFTs press F3 to open the menu and select “Data memory” / “View/delete FFT data”. Use the keys ▲▼ to select the desired FFT. A cursor function using the keys ◄►... -
Page 25: Data Transfer To A Pc
CV:31A Vibration Meter User Manual Page 25 Data Transfer to a PC Connection to a PC The CV:31A has a USB interface. The supplied ZL:311 USB cable is connected to the CV:31A via its 8 pin connector. Switch the device off before connecting it to the PC. Connect the other end of the cable to a USB port on the computer and switch the CV:31A on again. -
Page 26: Data Import To The Excel Worksheet
Page 26 CV:31A Vibration Meter User Manual Data import to the Excel worksheet Open the worksheet “Import”. If previous measurement data appears in the table, please save the file under another name and then click “Clear tables” to erase all measurements from the tables. -
Page 27: Calculation Of Vibration Exposure A(8) And Vdv(8)
CV:31A Vibration Meter User Manual Page 27 Calculation of Vibration Exposure A(8) and VDV(8) Vibration exposure A(8), and alternatively, VDV(8), are both used for the risk assessment of human vibration. They can be calculated based on hand-arm (H/A) and whole-body measurements (W/B). -
Page 28: Data Logger Import
Page 28 CV:31A Vibration Meter User Manual The result(s) will be compared with the limits stated in the EU directive 2002/44/EC and are displayed in various colours: black: below exposure action value purple: between exposure action value and exposure limit red: above exposure limit During vibration exposure calculation a report is generated automatically. - Page 29 CV:31A Vibration Meter User Manual Page 29 Figure 42: Log File Header Import Figure 43: Log file details...
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Page 30: Fft Import
Page 30 CV:31A Vibration Meter User Manual FFT Import The FFT data stored on the CV:31A can also be transferred to the Excel macro file. Switch to the worksheet “FFT Import”. If previous FFT data appears in the table, please save the file under another name and click “Clear FFTs”... -
Page 31: Appendix 1 Fundamentals Of Human Vibration Measurement
CV:31A Vibration Meter User Manual Page 31 Appendix 1 Fundamentals of Human Vibration Measurement Introduction 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: •... -
Page 32: Exposure Limit Values
Page 32 CV:31A Vibration Meter User Manual Exposure Limit Values The directive lays down the following limit values: Hand-Arm, RMS Whole-Body, RMS Whole-Body, VDV Exposure 2.5 m/s² 0.5 m/s² 9.1 m/s 1,75 action value Exposure limit 5 m/s² 1.15 m/s² 21 m/s 1,75 Table 1: Limits to EU directive 2002/44/EC... - Page 33 CV:31A Vibration Meter User Manual Page 33 is the energy equivalent mean value of the frequency weighted acceleration during exposure, which means For Hand-Arm Vibration the X/Y/Z vector sum of Wh frequency- weighted RMS values (2) �� = √ �� + ��...
- Page 34 Page 34 CV:31A Vibration Meter User Manual �� (8) = √ �� ∑ �� �� �� ���� ������ �� ��=1 Equation 4 �� (8) = √ �� ∑ �� �� �� ���� ������ �� ��=1 Equation 5 �� (8) = √ ��...
- Page 35 CV:31A Vibration Meter User Manual Page 35 Equation 7 where VDV(8) is the daily exposure value VDV is the frequency-weighted vibration dose value is the duration of exposure is the duration of VDV measurement meas Daily exposure may consist again of several partial exposure sections. Separate daily exposure values are to be calculated for X/Y/Z.
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Page 36: Appendix 2 Weighting Filters
Page 36 CV:31A Vibration Meter User Manual Appendix 2 Weighting Filters Hand-arm weighting filter Wh 10.0000 Wh min ISO 8041 Wh max ISO 8041 1.0000 Wh CV:31A 0.1000 0.0100 0.0010 0.0001 1000 10000 Whole-body weighting filter Wd Wd min ISO 8041 Wd max ISO 8041 Wd CV:31A 0.01... -
Page 37: Whole-Body Weighting Filter Wk
CV:31A Vibration Meter User Manual Page 37 Whole-body weighting filter Wk Wk min ISO 8041 Wk max ISO 8041 Wk CV:31A 0.01 0.001 0.0001 1000 Whole-body weighting filter Wb for passenger trains Wb min ISO 8041 Wb max ISO 8041 Wb CV:31A 0.01 0.001... -
Page 38: Whole-Body Weighting Filter Wc For The Backrest Of Seats
Page 38 CV:31A Vibration Meter User Manual Whole-body weighting filter Wc for the backrest of seats Wc min ISO 8041 Wc max ISO 8041 Wc CV:31A 0.01 0.001 0.0001 1000 Whole-body weighting filter Wj for the head of recumbent persons Wj min ISO 8041 Wj max ISO 8041 Wj CV:31A... -
Page 39: Whole-Body Weighting Filter Wm For Persons In Buildings
CV:31A Vibration Meter User Manual Page 39 Whole-body weighting filter Wm for persons in buildings Wm min ISO 8041 Wm max ISO 8041 Wm CV:31A 0.01 0.001 0.0001 1000... -
Page 40: Appendix 3 Specifications
Page 40 CV:31A Vibration Meter User Manual Appendix 3 Specifications Inputs 4 Low-power IEPE inputs, 1 mA / 17 V, transducer sensitivity range 0.8 to 120 mV/ms TEDS support for template 25 to IEEE 1451.4 Display functions Human vibration Interval RMS Vector sum Maximum running RMS (MTVV) General vibration... -
Page 41: Appendix 4 Ce Declaration Of Conformity
CV:31A Vibration Meter User Manual Page 41 Appendix 4 CE Declaration of Conformity Cirrus Research plc Hunmanby UK CE Certificate of Conformity Manufacturer: Cirrus Research plc Acoustic House, Bridlington Road Hunmanby, North Yorkshire, YO14 0PH United Kingdom Telephone +44 1723 891655... - Page 42 This two-year period covers failure and poor workmanship only. 2. If the product is calibrated by Cirrus Research or an authorised calibration and service centre, then the initial 12-month warranty is extended by a further 12 months, with the same conditions, for up to 15 years in total.
- Page 43 Page 43 Cirrus Research Offices The addresses given below are the Cirrus Research plc offices. Cirrus Research plc also have approved distributors and agents is many countries worldwide. For details of your local representative, please contact Cirrus Research plc at the address below. Contact details for Cirrus Research authorised distributors and agents are also available from the Internet Web site at the address shown below.
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